The Aviation DataBase: Service Information: Pratt & Whitney
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All Operators Telexes
NameRevisionLangSubjectDate
en A/310/A300-600 JT9D-7R4 or PN4000 Engines -Thrust Reverser Systems Deactivation11/30/1998
All Operators Wires
NameRevisionLangSubjectDate
en 1st Stage Fan Blade4/6/1995
en JT9D-7R4 Fuel Nozzle Maintenance10/14/1983
Commercial Support Program Notifications
NameRevisionLangSubjectDate
en New Transfer Tubes with Heat Shield - Replacement of3/22/2005
3 en New Transfer Tubes with Heat Shield - Replacement of12/26/2006
1 en PW500 - Fuel Manifold - Introduction of11/24/2005
1 en PW500 - Fuel Manifold - Introduction of11/24/2005
3 en PW500 - Fuel Manifold - Introduction of2/26/2007
3 en PW500 - Fuel Manifold - Introduction of2/26/2007
4 en PW500 - Fuel Manifold - Introduction of6/29/2007
1 en PW306C Electronic Engine Control (EEC) & Engine Diagnostic Unit (EDU) Software Reprogramming2/23/2006
en PW530A, PW535A, PW545A and PW545B Fuel Control Unit (FCU) Upgrade12/23/2005
7 en PW530A, PW535A, PW545A and PW545B Fuel Control Unit (FCU) Upgrade1/27/2010
1 en Accessory Gear Box (AGB) Starter & Alternator Pad Seals - Replacement of8/7/2006
en Gas Generator Case to Intermediate Case Retaining Bolts - Borescope Inspection of7/13/2007
1 en Gas Generator Case to Intermediate Case Retaining Bolts - Borescope Inspection of4/24/2008
2 en Electronic Engine Control (EEC) - Replacement/Modification3/10/2008
en Intermediate Case Grounding Terminal Stud Installation - Inspection of4/24/2008
en Intercompressor - Bleed - Valve Servo Valve - Inspection7/16/2008
en Intercompressor - Bleed Valve Servo Valve - Inspection of1/29/2009
en Alternator and Starter Seals - Replacement of6/3/2009
1 en Turbine Exhaust Cone, Inner By-Pass Duct Assembly, Fuel Manifold and Fuel Shut-off Cable Grommets and Cover Plate Fairing - Replacement of8/27/2009
en Fuel Oil Heat Exchanger (FOHE) Fuel - Filter Bypass Valve - Replacement of10/26/2009
1 en Fuel Oil Heat Exchanger (FOHE) Fuel - Filter Bypass Valve - Replacement of12/9/2009
1 en PY and P3 Insulated Air Pressure Tubes - Inspection/Replacement of10/19/2010
en Servo Valve - Replacement of8/2/2010
en Oil Lever Indicator and Oil Filter Cap - Replacement of11/7/2000
en P3 Bellow Seals - Replacement of4/3/2002
en Bellow Seal for Cabin Bleed Air Tubes - Replacement of4/5/2002
en Turbofan Engine Fuel Tube - Inspection of4/24/2002
en Fuel Manifold - Inspection/Replacement of9/15/2003
en HFC Radio Unit Orifice Adjustment - Inspection of11/21/2003
en Fuel Pressure Tube Replacement and Attenuator, Introduction of11/14/2003
1 en Fuel Pressure Tube Replacement and Attenuator, Introduction of12/23/2003
3 en Fuel Pressure Tube Replacement and Attenuator, Introduction of6/2/2004
1 en Front Fan Case Assembly Vibration Damper Ring - Introduction of5/20/2004
1 en Alternator Plain Seal - Replacement of4/29/2004
en AC Alternator Drive Spur Gearshaft Assembly - Inspection of5/20/2004
2 en Combustion Chamber Dome Bulging Exchange Program8/2/1996
en Inspection/Replacement of Bleed Off Valve (BOV) Cover11/26/1996
4 en Inspection/Replacement of Fuel Nozzles and Manifold Adapters5/13/1998
en BOV Diaphragm Replacement7/1/1998
en No. 1 Bearing Outer Housing - Inspection of11/23/1998
1 en Compressor Bleed Valve (BOV) - Replacement of2/18/2000
1 en Borescope Inspection of Impeller Rear Face9/4/2003
Component Maintenance Manuals
NameRevisionLangSubjectDate
2 en PT6A-66D - FAST (Flight-Data Acquisition Storage & Transmission) System3/15/2021
Engine Manuals
NameRevisionLangSubjectDate
en Power Plant General - Testing-206/15/1999
en Power Plant General - Testing-206/15/1999
en Power Plant General - Testing-206/15/1999
en Turbine Airseals (Stages 3, 4, 5 and 6 Rotating) - Inspection-0112/1/1986
en First Stage Compressor Rotor (Fan) Blade Assembly - Repair-196/15/1990
Maintenance Manuals
NameRevisionLangSubjectDate
en Engine - Troubleshooting5/1/1990
en Engine General - Troubleshooting-02 (Lubrication System)8/1/1991
en JT15D-111/28/1974
en Chip Detector - Description and Operation1/15/1991
en Oil Regulating Valve Assembly1/15/1991
Overhaul Manuals
NameRevisionLangSubjectDate
revised en Wasp Jr. (985) B4, B5, Wasp (R-1340) S1H1, S1H2, S3H1, S3H2, S3H1-G and S1H4 Engines9/30/1979
Procedures
NameRevisionLangSubjectDate
A en Combustion Chamber Outer Case Boss Weld Ultrasonic Inspection (Unassembled)10/7/1995
B en Combustion Chamber Outer Case Rear Flange O.D. Eddy Current Inspection - Motorized (Assembled or Aircraft Installed)10/7/1995
en Combustion Chamber Outer Case Rear Flange O.D. Eddy Current Inspection (Assembled/Aircraft Installed)10/7/1995
en Combustion Chamber Outer Case Rear Flange Aft Surface Eddy Current Inspection (Hot Section Disassembly)10/7/1995
en Combustion Chamber Outer Case Rear Flange Bolt Holes Rotating Eddy Current Inspection (Unassembled)10/7/1995
A en Combustion Chamber Outer Case Rear Flange Bolt Hole Intergranular Cracking Ultrasonic Inspection (Post-Assembly)10/7/1995
A en Combustion Chamber Outer Case Rear Flange I.D. Borescope Inspection (Assembled/Installed)10/7/1995
en Combustion Chamber Outer Case Boss Weld Ultrasonic Inspection (Assembled or Aircraft Installed Engine)10/7/1993
en 14th and 15th Stage HPC Disk Bore I.D. Surface Eddy Current Inspection (Disassembled or HPC Central Cavity Access)11/7/1995
B en GP7000 Fan Hub - Blade Slot Bottom Manual Eddy Current Inspection - LPC Module Assembly, Piece-Part or Engine (On-Wing or Off-Wing with Fan Blades Removed)4/8/2018
C en GP7000 Fan Hub - Blade Slot Bottom Manual Eddy Current Inspection - LPC Module Assembly, Piece-Part or Engine (On-Wing or Off-Wing with Fan Blades Removed)9/4/2018
A en GP7000 Fan Hub - Blade Slot FWD Edge Manual Eddy Current Inspection - LPC Module Assy, Piece-Part or, Engine (On-Wing or Off-Wing with Fan Blades Removed)4/9/2018
A en GP7000 Fan Hub - Replication to Support Local Surface Characterization of Blade Slot Bottom - LPC Module Assembly, Piece-Part or Engine (On-Wing or Off-Wing with Fan Blades Removed)4/10/2018
Service Bulletins
NameRevisionLangSubjectDate
D en Unable to Communicate with Processor Due to Data Flash being Put into Unknown State7/27/2009
en FASTTM System Configuration for the Cessna Grand Caravan EX3/11/2014
en Alert Cylinder Attachment Inspection and Maintenance8/19/1955
5 en Rotor Components - Service Life5/12/1970
3 en Engine Operating Time between Overhuals and Hot Section Inspection Frequency1/8/1970
en Introduction of Improved Compressor Turbine Blade Retaining Rivets5/14/1970
en Introduction of Improved Power Turbine Blade Retaining Rivets5/14/1970
en Tightening Torque and Stretch Recommendations7/8/1949
18 en Engine Operating Time between Overhauls and Hot Section Inspection Frequency7/13/1990
en Modification of Propeller Shaft Oil Transfer Sleeve and Housing3/1/1974
A en Vibration Damper Assemblies Wear6/6/1950
3 en Introduction of Power Turbine Shaft Housing Reinforcing Sleeve - or Improved Power Turbine Shaft Housing8/19/1977
2 en Introduction of Compressor Delivery Air Line Filter8/11/1978
6 en Introduction of Modified Combustion Chamber Liner3/12/1980
16 en Engine - Inspection and Rework of Front Compressor Front Hub and Front Compressor Second Stage Disk3/21/1973
6 en Introduction of Power Turbine Containment Ring3/17/1980
3 en Introduction of Power Turbine Containment Ring3/17/1980
en Bendix-Stromberg PR-58E5-15 Carburetors9/17/1951
3 en Introduction of Improved Compressor Delivery Air Line Filter5/28/1980
1 en Introduction of Improved Engine/Fuel Pump Coupling2/18/1981
1 en Introduction of Compressor Delivery Air Line Filter10/5/1981
2 en Introduction of Compressor Delivery Air Line Filter11/9/1981
1 en Introduction of Compressor Delivery Pressure (P3) Air Line Filter9/27/1985
1 en Fuel Control Actuating Lever with Positive Return Ramp - Introduction of6/18/1990
en Improved Oil Filler Tube with Ball Valve Assembly - Introduction of11/1/1990
1 en Turboprop Engine - Conversion of PT6A-114 Model to PT6A-114A Configuration4/6/1993
4 en Engine - Replacement of Elbow, Fuel Control-to-Fuel Pump Return Tube Assembly - and Revised Routing Clips, Right Igniter Plug Cable6/30/1969
en Replacement of Turboprop Engine Compressor Bleed Off Valve2/18/2000
en Bendix-Stromberg PR58E5-27 Carburetors3/23/1956
en Bendix-Stromberg PR58E5-17 Carburetors3/27/1956
en Bendix-Stromberg PR-58E5 Carburetors10/24/1956
A en Cam Reduction Gears11/24/1959
en Conversion of Model Twin Wasp D (R-2000) Series Engines from Left Hand Magneto Drive to Right Hand Drive9/13/1963
B en Inspection and Rework of Flyweights and Flyweight Liners & Crankshaft6/18/1968
en Ultrasonic and Visual Inspection of Cylinder-Head11/1/1977
en R-1340 Cylinder Head - Fluorescent Penetrant Inspection & Visual Inspection of R-1340 Cylinder Head9/7/1983
6 en Engine - Repair of Shaft, Turbine, Front Compressor Drive1/26/1971
13 en Engine - Inspection of Diffuser Case1/13/1978
en Introduction of Engine-Turbine/Turboprop Improved Engine/Fuel Coupling
1 en Turboprop Engine; Inspection/Replacement of Bleed Off Valve (BOV) Cover12/3/1996
3 en Engine - Replacement of Disk, Compressor12/10/1973
2 en Engine Fuel and Control - Repair and Strengthening of Support Assembly, Fuel Nozzle10/5/1972
1 en Engine Fuel and Control - Rework of Support Assembly, Fuel Nozzle4/17/1972
2 en Air - Incorporation of Bleed System, 15th Stage and Bleed Control Assembly Module6/13/1972
7 en Engine - Rework of Turbine Rotor, Fourth and Fifth Stage; Seal, and Ring, Sixth Stage; Replacement of Bolt, Tee Head; Incorporation of and Baffle, Turbine Air Seal11/27/1974
6 en Engine - Replacement of Seals, Face, Main Gearbox Assembly12/17/1973
3 en Engine - Replacement of Vane Assembly, Turbine, Second Stage11/15/1974
1 en Alert Engine - Inspection of Thin Lug Turbine Nozzle Case8/17/1973
2 en Engine - Incorporation of Nozzles, Spray (Fog), Main Gearbox5/25/1973
2 en Alert Engine - Inspection and Rework of First Stage Compressor Blade4/20/1978
3 en Engine - Case and Duct Set, Turbine - Incorporation of Improved Cooling Air System in Turbine Case9/29/1978
en Turboprop Engine; Inspection/Replacement of Bleed Off Valve (BOV) Cover12/10/1996
4 en Engine - Rework of Blade Assembly, Compressor First Stage10/28/1976
2 en Alert Engine - Vane Assembly, Second Stage Turbine Stator and Shroud Assembly, Second Stage Turbine Stator Inner - Inspection7/19/1974
8 en Alert Engine - Temperature Check of Compartment Breather - No. 3 Bearing12/5/1977
1 en Engine - Rework of Case, Combustion Chamber Outer7/8/1976
4 en Alert Engine - Reoperation of Turbine Exhaust Case1/27/1977
1 en Engine - Replacement of Elbow, Main Bearing Breather Tube4/7/1976
3 en Fan Blade Inspection10/14/1976
1 en Alert Engine - Second Stage Fan Blade Pin Retention Rivets - Inspection5/27/1976
1 en Alert Engine - Modification of Riveting Configuration, Third Stage Turbine Blade8/20/1976
3 en Alert Engine - Modification of Riveting Configuration, Third Stage Turbine Blade5/5/1978
en Alert Engine - Removal from Service of Bearing, No. 4 1/28/12/1976
1 en Alert Engine - Removal from Service of Bearing, No. 4 1/22/18/1977
2 en Alert Engine - Removal from Service of Bearing, No. 4 1/27/26/1977
2 en Alert Engine - Hub - Front Compressor Front - Inspection3/18/1977
3 en Alert Engine - Rework of Hubs, Turbine Rear8/17/1978
en Alert Engine - Disks, High Pressure Compressor, Inspection for Tierod Hole Cracking4/6/1977
12 en Alert Engine - Disks, High Pressure Compressor, Inspection for Tierod Hole Cracking3/8/1990
2 en Alert Engine - Disks, High Pressure Compressor, Inspection for Tierod Hole Cracking2/13/1978
3 en Alert Engine - Disks, High Pressure Compressor, Inspection for Tierod Hole Cracking5/3/1978
4 en Alert Engine - Disks, High Pressure Compressor, Inspection for Tierod Hole Cracking6/26/1978
5 en Alert Engine - Disks, High Pressure Compressor, Inspection for Tierod Hole Cracking7/25/1978
6 en Alert Engine - Disks, High Pressure Compressor, Inspection for Tierod Hole Cracking5/30/1980
7 en Alert Engine - Disks, High Pressure Compressor, Inspection for Tierod Hole Cracking2/16/1981
9 en Alert Engine - Disks, High Pressure Compressor, Inspection for Tierod Hole Cracking6/13/1983
3 en Alert Engine - First Stage Compressor Fan Blade Information Concerning Blue-Etch Anodize Inspection and Refurbishment3/10/1978
1 en Alert Engine - No. 4 Bearing Compartment - Inspection & Cleaning12/4/1978
5 en Engine - Rework of Seal Assembly, Sixth Stage Turbine Air9/27/1983
6 en Alert Engine - First Stage Fan Hub Blade Slots - Inspection7/15/1983
en Alert Engine - Main Gearbox Assembly - Magnetic Plug Inspection3/27/1978
1 en Engine - Installation of Strainer Element Assembly, No. 4 Bearing Compartment4/9/1979
en Alert Engine - Disk, 15th Stage Rear Compressor - Inspection8/15/1978
1 en Alert Automatic Fuel Control Unit - Bypass Valve Diaphragm Replacement2/15/1978
2 en Replacement of Temperature Compensator11/6/1984
3 en Alert Engine, Hub, Rear Compressor Front - Balance Flange Inspection and Rework8/16/1988
2 en Engine - Manifold Assembly, Bleed Valve Control Fuel Signal - Replace with a Manifold Having a Recontoured Tube and Added Support8/16/1982
3 en Engine - Replacement of Pins, Low Pressure Turbine Vane, Locating6/24/1985
1 en Engine - Blade, 3rd Stage Turbine - Increased Shroud Notch Contact Area; and Undersize Air Sealing Ring Modification1/8/1990
3 en Engine - Gearbox Assembly, Main - Removal of Centrifugal Oil Filter Drive System11/7/1984
3 en Engine - Case Assembly, Rear Turbine - Incorporation of Additional Antirotation Pins12/5/1984
1 en Engine - Inspection and Repair of Seal, Air Low Pressure Turbine (LPT), 3rd Stage - Modification of Front Snap Diameters; and Disk, Turbine, 2nd Stage2/13/1984
1 en Alert Engine - Disk, 2nd Stage Turbine - Inspection5/4/1984
4 en Engine Fuel and Control - Nozzle and Support Assembly, Fuel - Incorporation of a Welded Nozzle to Support Configuration6/23/1988
4 en Engine - Diffuser Case - Eddy Current Inspection of Case Rear Rail for Cracks3/6/1986
7 en Engine - Diffuser Case - Eddy Current Inspection of Case Rear Rail for Cracks8/25/1992
en Engine - Replacement of Blade, Low Pressure Compressor (LPC), Fifth Stage11/26/1985
en Alert Engine - Second Stage Turbine Vane Inner Shroud Position - Radioisotope Inspection7/31/1985
en Alert Engine - Combustion Chamber Assembly - Inspection Requirements11/15/1985
1 en Alert Engine - Combustion Chamber Assembly - Inspection Requirements3/21/1986
10 en Alert Engine - Combustion Chamber Assembly - Inspection Requirements7/7/1995
en Alert Engine - Spacer Assembly, Compressor Rotor, 7th-8th Stage, 8th-9th Stage, 9th-10th Stage, 10th-11th Stage, 11th-12th Stage, and 12th-13th Stage - Replacement of Removable Sleeve Configurations with Integral Configurations1/15/1986
3 en Alert Engine - Spacer Assembly, Compressor Rotor, 7th-8th Stage, 8th-9th Stage, 9th-10th Stage, 10th-11th Stage, 11th-12th Stage, and 12th-13th Stage - Replacement of Removable Sleeve Configurations with Integral Configurations8/19/1987
en Engine - Incorporation of Complete Low Emission Combustion Chamber and Fuel Nozzle Package1/17/1986
2 en Engine - Vane Assembly, 2nd Stage Turbine - Borescope Inspection Intervals6/11/1992
en Engine - Diffuser Case - Eddy Current Inspection of Case Rear Rail for Cracks3/6/1986
1 en Alert Engine - Case Assembly, Combustion Chamber Outer - Inspection Requirements9/24/1986
6 en Alert Engine - Case Assembly, Combustion Chamber Outer - Inspection Requirements6/26/1989
8 en Alert Engine - Case Assembly, Combustion Chamber Outer - Inspection Requirements11/5/1993
en Engine - Tube Assembly, No. 4 Bearing Internal Oil Pressure - Replacement of with a Tube having a Larger Diameter9/17/1986
3 en Engine - Vane Clusters, 2nd, 3rd, and 4th Stage Turbine - Modification of Increase Circumferential Gap at Inner and Outer Platforms4/1/1987
en Alert Engine - Blade or Blade Assembly, Compressor Rotor, 2nd Stage - Inspection of Root Attachment Straps1/29/1987
2 en Alert Engine - Blade or Blade Assembly, Compressor Rotor, 2nd Stage - Inspection of Root Attachment Straps7/8/1988
en Engine - Incorporation of Strut Insert, Diffuser Case2/4/1987
en Engine - Case Assembly, Low Pressure Turbine - Radiographic Isotope Inspection of the Vane Anti-Rotation Pins2/20/1987
1 en Engine - Disk, First Stage Turbine - Eddy Current Inspection or Fluorescent Penetrant Inspection of Cooling Air Holes for Cracks3/21/1990
2 en Engine - Airseal, Sixth Stage Turbine - Modification to Reduce the Axial Length of the Seal Wing10/24/1990
5 en Engine - Vane and Vane Cluster Assembly, Low Pressure Turbine (LPT), 3rd and 4th Stages - Modification of to Incorporate Reduced Inner Platform Leading Edge8/3/1993
4 en Engine - Diffuser Case - Eddy Current Inspection of Case Rear Rail for Cracks5/10/1993
5 en Engine - Diffuser Case - Eddy Current Inspection of Case Rear Rail for Cracks9/29/1995
8 en Engine - Diffuser Case - Eddy Current Inspection of Case Rear Rail for Cracks10/30/1998
2 en Engine - Case, Turbine Rear - Incorporation of Improved Anti-Rotation Pins and Vane Clusters, 2nd, 3rd and 4th Stage Turbine - Modification of to Increase Anti-Rotation Slot Width7/20/1989
2 en Alert Engine - Case Assembly, Low Pressure Turbine, Radiographic Isotope Inspection of the Vane Anti-Rotation Pins12/11/1987
6 en Engine - Case and Stator Assembly, Diffuser - Modification of to Incorporate Diffuser Case with the Rear Rail Detached from the Bosses for Weld Repaired Diffuser Cases or Diffuser Cases Requiring Weld Repairs9/15/1993
en Alert Engine - Incorporation of Plate, Retaining, Blade, Low Pressure Compressor, 1st Stage2/15/1989
3 en Alert Engine - Case Assembly, Combustion Chamber Outer - Inspection Requirements10/10/1990
2 en Engine - Airseal, 6th Stage Turbine - Modification of to Increase Clearance10/31/1990
1 en Alert Engine - Inspection of Rotor, Compressor Hubs, Disks, Spacers and Airseals12/13/1991
1 en Engine - Seal, Air, First Stage High Pressure Turbine (HPT) - Replacement of with a Prior, More Durable, Air Seal12/20/1989
6 en Engine Fuel and Control - Pump - Fuel Modification of by Incorporation of an Improved Gearbox Quick Disconnect Adapter Assembly12/20/1993
en Engine - Case Assembly, Turbine Exhaust - Modification of to Incorporate Shields3/27/1990
4 en Alert Engine - Blade, Turbine Rotor, 3rd and 4th Stage - Uncontained Blade Fracture Management2/20/1992
5 en Alert Engine - Blade, Turbine Rotor, 3rd and 4th Stage - Uncontained Blade Fracture Management8/10/1992
5 en Alert Engine - Blade, Turbine Rotor, 3rd and 4th Stage - Uncontained Blade Fracture Management8/10/1992
2 en Alert Engine - Compartment, No. 4 and 5 Bearing - Preventive Management of Oil Fires and High Pressure Turbine Shaft Fractures6/8/1992
3 en Alert Engine - Compartment, No. 4 and 5 Bearing - Preventive Management of Oil Fires and High Pressure Turbine Shaft Fractures12/16/1994
en Engine - Case Assembly, Turbine Exhaust - Incorporation of Thicker Case Wall12/14/1990
3 en Engine - Airseal, Turbine, Sixth Stage - Borescope and Eddy Current Inspection of the Retaining Wing5/20/1992
4 en Engine - Airseal, Turbine, Sixth Stage - Borescope and Eddy Current Inspection of the Retaining Wing5/6/1998
2 en Engine - Airseal, Turbine, Sixth Stage - Eddy Current Inspection of the Knife Edges4/28/1992
5 en Alert Engine - Disks, 7th, 8th, 9th, 10th, 11th, and 12th Stage High Pressure Compressor (HPC) - Inspection for Corrosion8/17/1994
3 en Alert Engine - Low Pressure Turbine Case Shield Assemblies and Fan Exhaust Inner Front Duct Segment Assembles for Improved 3rd and 4th Stage Low Pressure Turbine (LPT) Containment10/15/1993
7 en Alert Engine - High Pressure Turbine (HPT), with Improved Containment Capabilities5/24/1993
1 en Engine - Airseal, Sixth Stage Turbine - Replace with an Airseal Made of Nickel Alloy Material and Improved Blade Retention4/24/1992
1 en Engine - Case and Stator Assembly - Diffuser - Diffuser Case Ultrasonic and Metallographic Inspection of the Shell Wall and Ultrasonic Inspection of the Rear Rail at the Boss 6 Location8/20/1992
en Engine - Case and Stator - Diffuser Assembly - Do an X-Ray Inspection of the Rear Rail and Sides of Bosses8/5/1992
2 en Alert Engine - Hub, Front, Low Pressure Compressor (LPC) - Inspection for Cracks6/18/1993
2 en Engine- Case and Stator, Diffuser - Replacement of to Incorporate an Improved Rear Rail Configuration5/14/1993
en Engine- Case Assembly, Turbine Exhaust - Replacement of with a Thicker Wall Case for Better Blade Containment4/13/1993
3 en Engine - Case Assembly, Turbine Exhaust - Replace the Flange 'P' with a New Flange that Has a Thicker Case Wall for Better Blade Containment1/10/1996
en Engine Fuel and Control - Pump, Fuel - Modification of by Incorporation of a Better Gear Box Quick Disconnect Adapter Assembly9/10/1993
en Engine - Bolts, Low Pressure Turbine Case - Incorporation of Bolts with Stronger Material1/19/1994
1 en Engine - Bolts, Low Pressure Turbine Case - Incorporation of Bolts with Stronger Material8/27/1998
1 en Engine - Case Assembly, Turbine Exhaust - Replacement of 'P' Flange7/17/1996
en Engine - Blade Assembly, First Stage Low Pressure Compressor (LPC) - Introduce 55 Degree Angle Shroud to Minimize Shroud Locking10/31/1994
2 en Engine - Blade, Low Pressure Turbine (LPT) Rotor, 3rd and 4th Stage - Inspection for Shroud Notch Wear8/27/1998
en Engine - Case Assembly, Turbine Exhaust - Replacement of with a Thicker Wall Case for Better Blade Containment2/1/1996
21 en Engine Operating Time Between Overhauls and Hot Section Inspection Frequency1/30/1991
1 en Improved Durability Combustion Chamber Liner - Introduction of11/12/1974
3 en Introduction of Modified Fuel Manifold Assembly2/23/1979
3 en Operation of a JT15D-1A Engine as a JT15D-1 Engine or a JT15D-1B Engine as a JT15D-1A or JT15D-1 Engine12/21/1982
1 en Conversion JT15D-1 to JT15D-1A1/25/1978
en Outer Bypass Duct - Improved Retention of P3 Air-to-Fuel Control Box2/16/1987
1 en Introduction of JT15D Fan Blade Inspection5/19/1987
2 en Introduction of JT15D Fan Blade Inspection7/2/1987
en Low Compressor Case Dampening Ring - Introduction of2/29/1988
1 en New Oil Filler Neck Assembly - Introduction of6/6/1989
en Improved Fuel Flow Divider Valve - Introduction of4/19/1990
1 en New Improved Gas Generator Case - Introduction of5/4/1990
1 en Turboprop Engine; Inspection/Replacement of Bleed Off Valve (BOV) Cover12/2/1996
en Turboprop Engine Turbine Exhaust Duct - Inspection of Bulletin Index Locator1/24/2002
1 en Engine Turbine/Turboprop - Fuel Nozzles Revised Configuration - Introduction of5/19/1983
3 en Turboprop Engine - Modification of Power Turbine Containment Ring1/17/1992
en Replacement of Turboprop Engine Asbestos Fiber Gaskets10/8/1993
12 en Engine Turbine/Turboprop Rotor Components - Service Life11/9/1983
2 en Introduction of Engine-Turbine/Turboprop No. 2 Bearing Oil Pressure Tube with Increased Wall Thickness3/31/1978
2 en Replacement of Turboprop Engine Power Turbine Shroud12/6/1991
en Alert Introduction of Engine Turbine/Turboshaft Third-Stage Compressor Stator Vibration Damping Strap12/31/1987
en Conversion of Engine Turbine/Turboshaft PT6B-36 Engines to PT6B-36A9/28/1987
1 en Introduction of Engine Turbine/Turboprop Improved Linearity Fuel Control Unit8/16/1989
3 en Inspection of Turboprop Engine Compressor Turbine Blades4/19/1993
1 en Replacement of Turboprop Engine Compressor Turbine (C.T.) Stator Assembly, C.T. Shroud Housing, Small Exit Duct Assembly5/12/1993
1 en Introduction of Turboprop Engine Compressor Turbine Blade with Feather Seals5/12/1993
1 en Alert Deletion of Auxiliary Power Unit Oil Strainer Element5/12/1993
2 en Alert Auxiliary Power Unit - Replacement of Exhaust Duct Support and Insulation Blankets3/1/2011
6 en Alert Engine - Blade, Turbine Rotor, 3rd and 4th Stage - Uncontained Blade Fracture Management10/15/1993
3 en Alert Engine - Hub, Front, Low Pressure Compressor (LPC) - Inspection for Cracks6/16/1994
1 en Alert Engine - Turbine Assembly, Low Pressure (LPT) - Improved 3rd and 4th Stage Containment10/15/1993
en Alert Engine - Bracket, No. 6 Bearing Scavenge Pump - Modification to Allow LPT Intermeshing of Blades and Vanes if an LPT Shaft Fracture Occurs8/24/1993
1 en Alert Engine - Bracket, No. 6 Bearing Scavenge Pump - Modification to Allow LPT Intermeshing of Blades and Vanes if an LPT Shaft Fracture Occurs5/16/1995
2 en Alert Engine - Bracket, No. 6 Bearing Scavenge Pump - Modification to Allow LPT Intermeshing of Blades and Vanes if an LPT Shaft Fracture Occurs7/28/1997
1 en Alert Engine Fuel and Control - Nozzle and Support Assembly, Fuel - Borescope Inspection for Burning6/8/1994
1 en Alert Engine Fuel and Control - Fuel Nozzle and Support Assembly - Replacement of with Welded Spacer for Improved Sealing to Prevent Fuel Leakage6/15/1994
2 en Alert Engine Fuel and Control - Fuel Nozzle and Support Assembly - Replacement of with Welded Spacer for Improved Sealing to Prevent Fuel Leakage10/26/1994
en Alert Engine - Tubes and Fitting, Oil Scavenge and Pressure - Modification to Install Fire Resistant Fittings for Engines that Incorporate the Low Emissions Configuration, Service Bulletin 56505/13/1994
2 en Alert Engine - Tubes and Fitting, Oil Scavenge and Pressure - Modification to Install Fire Resistant Fittings for Engines that Incorporate the Low Emissions Configuration, Service Bulletin 565010/20/1994
en Alert Engine - Case Assembly, Combustion Chamber Outer - Inspection for Intergranular Cracks2/20/1995
1 en Alert Engine - Case Assembly, Combustion Chamber Outer - Inspection for Intergranular Cracks1/4/1996
3 en Alert Engine - Disks, 10 thru 15th Stage High Pressure Compressor (HPC) - Inspection for Corrosion1/11/1996
en Alert Engine - Disks, High Pressure Compressor (HPC), 7th, 8th, 9th, 10th, 11th and 12th Stage - Inspection for Corrosion10/17/1995
en Alert Engine - Case Assembly, Combustion Chamber Outer (Original Design) - Consolidated Inspection Requirements11/7/1995
en Alert Engine - Disks, 14th and 15th Stage High Pressure Compressor - Inspection of Waspaloy Disks for Bore Cracks12/13/1995
2 en Alert Engine - Disks, 14th and 15th Stage High Pressure Compressor - Inspection of Waspaloy Disks for Bore Cracks6/26/1997
en Alert Engine - Blade Assembly, First Stage - Inspection for and Correction of Fan Blade Shroud Lock-Up1/25/1996
2 en Alert Engine - Blade Assembly, First Stage - Inspection for and Correction of Fan Blade Shroud Lock-Up6/29/1998
en Alert Engines - Hub, Front Compressor (LPC) (Fan Hub) - Eddy Current Inspection for Cracks9/24/1996
en Alert Engine - Hub, 4th Stage Low Pressure Turbine (LPT) - Inspection for Cracks11/7/1996
1 en Alert Engine - Hub, 4th Stage Low Pressure Turbine (LPT) - Inspection for Cracks12/9/1996
2 en Engine - Case Assembly, Combustion Chamber Outer - Introduce a One-Piece Machined Case Assembly8/27/1999
en Alert Engine - High Pressure Turbine (HPT) - Containment, with Improved Effectiveness9/10/1998
1 en Alert Engine - High Pressure Turbine (HPT) - Containment, with Improved Effectiveness4/23/1999
1 en Alert Engine - Case Assembly, Combustion Chamber Outer Front - Inspection Requirements7/30/1999
en Alert Engine Fuel and Control - Fuel Pump, Control Shaft - Make Inspection for Spline Wear3/15/2000
6 en Alert Engine - Blade, Low Pressure Turbine (LPT) Rotor, 3rd and 4th Stage - Inspection for Shroud Notch Wear5/3/2007
7 en Alert Engine - Blade, Low Pressure Turbine (LPT) Rotor, 3rd and 4th Stage - Inspection for Shroud Notch Wear8/26/2019
4 en Engine - Blades, Compressor First Stage - Reduced Leading Edge Thickness6/30/1989
3 en Engine - Replacement of Clevis, Engine Support11/5/1985
5 en Engine - Inspection of Blade Assembly, First Stage Compressor Rotor1/8/1990
en Engine - Replacement of Tube Assembly, No. 4 Bearing Internal Pressure3/26/1986
10 en Engine- Blade Assembly, First Stage Compressor Rotor - Incorporation of a 52 Degree Shroud9/2/1993
2 en Engine - Incorporation of Improved Fan Containment Features8/19/1987
3 en Engine - Incorporation of Improved Fan Containment Features2/19/1988
2 en Engine - Incorporation of Improved Fan Containment Features6/26/1987
5 en Engine - Incorporation of Improved Fan Containment Features3/31/1989
en Engine - Runners - Incorporation of Synchronizing Ring, Non Classified, 5th through 7th - Stage, High Pressure Compressor10/22/1986
en Alert Engine - Seal, Air, 2nd Stage Turbine - Replacement or Modification of Rotor Assembly, 1st Stage Turbine - Reduced Number of Metering Bolts; and Duct Assembly, Cooling Air High Pressure Turbine (HPT), 1st Stage - Increased Air Flow Characteristics10/25/1986
5 en Engine - Valve Assembly, 3.0 Bleed - Modification of by Incorporating a Vibration Dampening Configuration for Improved Durability6/23/1988
2 en Alert Engine - Shaft, High Pressure Compressor (HPC) Drive, Turbine - Eddy Current Inspection of Rear Threads12/22/1989
2 en Engine - Seal, Air, First Stage High Pressure Turbine (HPT) - Replacement of with a Prior, More Durable, Airseal3/2/1990
1 en Engine - Seal, Air, High Pressure Turbine (HPT), First Stage - Replacement of with a Prior, More Durable, Air Seal12/21/1989
1 en Engine - Case Assembly, Turbine Exhaust - Modification to Incorporate Shields8/16/1990
2 en Engine - Case, Turbine Exhaust, Assembly of - Modification of to Incorporate a Containment Shield5/10/1996
2 en Engine - Vane Cluster Assembly, 5th Stage Low Pressure Turbine (LPT) - Do a Visual Inspection to Find and Identify Vane Clusters with Cast Pockets2/8/1993
1 en Engine - Case, Turbine Exhaust - Replacement of with a Thicker Wall Case11/12/1993
en Alert Engine - Vane Cluster Assembly, 5th Stage Low Pressure Turbine (LPT) - Replacement of the 5th Stage LPT Vane Clusters which have Machined Slot4/20/1993
en Alert Engine - Stop, Low Pressure Turbine (LPT) Air Sealing Ring - Replacement of the Machine Bolt and Nut Option4/20/1993
1 en Engine - Replacement of Bolt, for the 3rd, 4th, and 5th Stage Low Pressure Turbine (LPT) Air Sealing Ring Stop Assembly10/9/1993
1 en Engine - Stop, Air Sealing Ring Assembly, 3rd, 4th, and 5th Stages Low Pressure Turbine - Replacement of with a Cast Stop11/20/1993
3 en Engine - Case Assembly, Turbine Exhaust - Replacement of 'P' Flange to Eliminate Flange Distortion or Provide Containment11/13/1996
en Engine - Case Assembly, Turbine Exhaust - Modification for Improved Containment10/18/1996
2 en Engine - Hub, 2nd Stage High Pressure Turbine (HPT) - Fluorescent Penetrant Inspection of the Tiebolt Holes for Cracks4/30/1998
1 en Engine - Disk, 1st Stage High Pressure Turbine, and, Hub, 2nd Stage High Pressure Turbine - Repetitive Inspection of for Possible Material Subsurface Anomalies2/17/1999
en Engine Fuel and Control - Modification of Control, Main Fuel5/3/1983
1 en Alert Engine - Disks, 14th Stage High Pressure Compressor - Inspection of Waspaloy Disks for Bore Cracks6/26/1997
en Alert Engine - Turbine Exhaust Case, One Time Metallographic Inspection for Shell Wall Weld Repairs in the Vicinity of the Mount Lugs on "R" and "S" Flanges3/19/1998
1 en Alert Engine - Turbine Exhaust Case, One Time Metallographic Inspection for Shell Wall Weld Repairs in the Vicinity of the Mount Lugs on "R" and "S" Flanges8/13/1998
en Alert Engine - Disk, 1st Stage High Pressure Turbine (HPT) - Repetitive Eddy Current Inspection of the Cooling Air Holes for Cracks7/28/1999
en Engine - Diffuser Case Assembly - Fuel Nozzle Bosses, Modification to Prevent Cracking; and, Front Rail, Modification for Stress Reduction; and, Dog Bone Bosses, Modification to Prevent Cracking and Stress Reduction5/20/1998
en Alert Engine - Turbine Exhaust Case - One Time Metallographic Inspection for Shell Wall Weld Repairs in the Vicinity of the Mount Lugs on "R" and "S" Flanges3/19/1998
1 en Alert Engine - Turbine Exhaust Case - One Time Metallographic Inspection for Shell Wall Weld Repairs in the Vicinity of the Mount Lugs on "R" and "S" Flanges8/13/1998
1 en Alert Engine - Combustion Chamber Outer Case - On Wing Ultrasonic Inspection of Front Flange ("L" Flange)10/8/1998
en Alert Engine - Disk, 1st Stage High Pressure Turbine (HPT) - Repetitive Eddy Current Inspection of the Cooling Air Holes for Cracks7/28/1999
23 en Turbofan Engine - Approved Listing of (Synthetic) Lubricating Oils11/10/2008
38 en Turbofan Engine - Engine Operating Time Between Overhauls and Hot Section Inspection Frequency9/9/2014
3 en Rework/Replacement of Turbofan Engine High Turbine Stator Assembly (Nickel)10/18/1991
1 en Introduction of Turbofan Engine High Turbine Blade Classified Retaining Rivets5/25/1991
2 en Rework of Turbofan Engine High Turbine Stator Assembly (Cobalt)12/19/1991
en Turbofan Engine - Fuel Control Unit Idle Solenoid - Replacement of10/11/1991
en Turbofan Engine Flow Divider Valve - Addition of Clamps10/14/1992
2 en Turbofan Engine - Single and Dual Ignition System Components - Replacement of11/27/1996
3 en Turbofan Engine - Fuel Control Unit (FCU) - Minimum Fuel Flow - Inspection of5/21/1996
en Turbofan Engine - Igniter - Replacement of6/15/1995
en Turbofan Engine - Oil Pressure and Compressor Air Pressure Tubes - Replacement of2/16/1995
en Turbofan Engine - Flow Divider Valve - Replacement/Modification of7/14/1995
1 en Turbofan Engine - Fuel Pressure to Cooler Tube Support Strut - Introduction of11/13/1995
2 en Turbofan Engine - Low Compressor Case Assembly - Inspection of5/15/1996
en Turbofan Engine - Fuel Control Unit - Inspection of Decel Schedule4/22/1996
1 en Turbofan Engine - Anti-Icing Valve - Replacement of2/1/1996
en Turbofan Engine - High Turbine Blade Lean - Inspection of4/3/1996
en Turbofan Engine - Rear Inner Compressor Stator - Field Inspection/Replacement of11/15/1996
en Turbofan Engine - Igniter Plugs - Replacement of2/24/1997
1 en Turbofan Engine - Fuel Control Unit (Overspeed Valve) - Field Inspection and Cleaning3/19/1999
1 en Turbofan Engine - Igniter Box Grounding Strap - Introduction of7/7/2000
en Turbofan Engine Borescope Inspection of Impeller Rear Face5/23/2003
1 en Turbofan Engine - Low Compressor Rotor - Replacement/Modification of7/9/2004
en Turbofan Engine - New Build Specification No. 1219 (JT15D-4) - Introduction of12/22/2005
en Turbofan Engine - Fuel Control Ratio Lever - Inspection of11/9/2006
en Turbofan Engine - Impeller Rear Face - Inspection of4/14/2022
en Alert Turbofan Engine - Introduction of New Compressor Air to HMU Delivery Tube3/26/2008
1 en Alert Turbofan Engine - Introduction of New Compressor Air to HMU Delivery Tube6/16/2008
27 en Turboprop Engine - Approved Listing of (Synthetic) Lubricating Oils10/18/2012
29 en Turboprop Engine - Approved Listing of (Synthetic) Lubricating Oils7/8/2014
28 en Turboprop Engine - Rotor Components - Service Life10/23/2012
29 en Turboprop Engine - Rotor Components - Service Life12/5/2013
21 en Turboprop Engine - Engine Fuels and Additives - Requirements and Approved Listing3/16/2005
26 en Turboprop Engine - Engine Fuels and Additives - Requirements and Approved Listing9/26/2013
5 en Turboprop Engine - Propeller Shaft Oil Seal Dust Seal - Introduction of Propeller Shaft Oil Seal Runner - Replacement of9/26/2013
4 en Turboprop Engine - Tachometer Drive Bevel Gearshaft - Modification of2/21/2014
3 en Turboprop Engine - Compressor Turbine Blade - Replacement of10/17/2013
1 en Turboprop Engine - Vane-Ring Damping-Strap Assembly of - Introduction of1/13/1995
1 en Turboprop Engine - Third-Stage Compressor-Stator Assembly - Replacement of; Impeller Housing, Compressor Bleed-Valve Assembly - Modification/Replacement of7/6/1995
en Turboprop Engine - Ignition-Exciter to Igniter Cable Assembly - Replacement/Rerouting of6/13/1995
5 en Turboprop Engine - Compressor Turbine Disk Balancing Assembly and Blades - Replacement/Modification of11/25/2013
3 en Turboprop Engine; Inspection/Replacement of Bleed Off Valve (BOV) Cover12/2/1996
4 en Turboprop Engine - Fuel Nozzles and Manifold Adapters Inspection/Replacement of5/13/1998
1 en Turboprop Engine - Fuel Nozzles and Manifold Adapters Inspection/Replacement of5/1/1998
7 en Turboprop Engine - Fuel Control Unit - Modification/Replacement of10/24/2013
en Turboprop Engine - No. 1 Bearing Outer Housing - Inspection of11/20/1998
1 en Replacement of Turboprop Engine Compressor Bleed Off Valve2/1/2000
en Turboprop Engine - Compressor Bleed Off Valve - Replacement of2/18/2000
2 en Turboprop Engine - Compressor Bleed Off Valve - Replacement of10/24/2013
en Replacement of Turboprop Engine Compressor Bleed Off Valve11/1/2000
en Turboprop Engine - Rear-Governor Heated-Air-Pressure Tube Assembly - Replacement of8/21/2000
2 en Inspection of Turboprop Engine Turbine Exhaust Duct10/1/2002
en Turboprop Engine - Shroud Segment - Inspection of2/18/2005
en Turboprop Engine - Oil Tank Filler Cap Inspection of5/24/2005
2 en Turboprop Engine - Seal, Plain - Replacement of4/24/2013
en Turboprop Engine - Fuel Pump, Coupling Shaft Spline - Inspection of12/23/2005
1 en Turboprop Engine - New Oil Tank Filler Cap and Gage Assembly - Replacement of11/20/2013
3 en Turboprop Engine - Bolts and Nuts of the FCU Connector Rod - Replacement of9/27/2007
1 en Turboprop Engine - Bolt of the FCU Connector Rod - Replacement of10/1/2007
5 en Turboprop Engine - Inspection/Replacement of Compressor Turbine Blades6/11/2009
9 en Turboprop Engine - Inspection/Replacement of Compressor Turbine Blades6/28/2013
en Turboprop Engine - PY and P3 Insulated Air Pressure Tubes - Inspection/Replacement of5/21/2010
1 en Turboprop Engine - Oil Scavenge Hose - Inspection of6/10/2011
1 en Turboprop Engine - Operating Time Between Overhauls and Hot Section Inspection Frequency11/13/2001
10 en Turboprop Engine - Operating Time Between Overhauls and Hot Section Inspection Frequency4/2/2014
7 en Turboprop Engine - Operating Time Between Overhauls and Hot Section Inspection Frequency5/9/2013
9 en Turboprop Engine - Operating Time Between Overhauls and Hot Section Inspection Frequency9/4/2013
en Turboprop Engine - Turboprop Engine with Hamilton Sunstrand Fuel Pump, Coupling Shaft Spline - Inspection of8/17/2012
1 en Turboprop Engine - Turboprop Engine with Hamilton Sunstrand Fuel Pump, Coupling Shaft Spline - Inspection of1/14/2014
en Turboprop Engine - Reversed Position Adjuster Bolt Installation6/28/2013
en Turboprop Engine - First Stage Carrier Balancing Assembly - Modification/ Replacement of9/25/2013
en Turboprop Engine - Fuel/Oil Heat Exchanger (FOHE) - Inspection of6/25/2013
en Turboprop Engine - Motive Flow Solenoid Valve - Replacement of6/13/2013
en Turboprop Engine - Power Turbine Disk - Replacement of7/2/2013
en Turboprop Engine - Propeller Reduction Gearbox Front Housing Assembly - Replacement of7/29/2013
1 en Turboprop Engine - Propeller Reduction Gearbox Front Housing Assembly - Replacement of2/4/2014
1 en Turboprop Engine - Fuel Filter Impending Bypass Indicator- Replacement of11/6/2013
en Turboprop Engine - Compressor Turbine Blades - Replacement of8/23/2013
en Turboprop Engine - Accessory Gearbox Housing Assembly - Modification / Replacement of1/27/2014
en Turboprop Engine - Accessory Gearbox (AGB) Housing Assembly - Replacement of12/12/2013
en Turboprop Engine - Torque Limiter - Inspection of12/10/2013
en Turboprop Engine - Single Port Turbine Exhaust Duct Assembly - Replacement/Modification of3/5/2014
en Turboprop Engine - Fuel Control Unit - Inspection of7/28/2014
1 en Turboprop Engine - Fuel Nozzle Tips - Inspection of2/18/2015
en Inspection/Replacement of Turboprop Engine - Fuel Pump12/19/2014
en Turboprop Engine - Scavenge-Pump Drive-Shaft Plug - Introduction of12/5/2019
1 en Turboprop Engine - Scavenge-Pump Drive-Shaft Plug - Introduction of12/23/2021
2 en Turboprop Engine - Operating Time Between Overhauls and Hot Section Inspection Frequency3/8/2013
2 en Turboprop Engine - Replacement/Modification of Oil-to-Fuel Heater8/9/2001
en Turboprop Engine - Modification of Main Pressure Pump Cover and Housing Assembly12/10/2003
en Turboprop Engine - Introduction of Oil Tank Pressurizing Valve12/10/2003
1 en Turboprop Engine - Inspection of Propeller Reversing Lever1/6/2009
en Turboprop Engine - Replacement/Modification of Propeller-Shaft Oil Seal Retaining-Ring-Halves7/19/2011
en Turboprop Engine - Fuel Pump - Inspection/Replacement of12/19/2014
2 en Turboprop Engine - Fuel Control Unit - Replacement/Modification of3/7/2016
3 en Turboprop Engine - Fuel Control Unit - Replacement/Modification of4/4/2016
en Turboprop Engine - Py Air Pressure Tube Assembly Support Bracket - Introduction of1/16/2017
1 en Turboprop Engine - Oil to Fuel Heater - Replacement/Modification of3/19/2020
9 en Turboprop Engine - Approved Listing of (Synthetic) Lubricating Oils7/8/2014
3 en Turboprop Engine - Improved Engine/Fuel Pump Coupling - Introduction of12/11/2001
1 en Turboprop Engine - Bleed Off Valve (BOV) Cover - Inspection/Replacement of12/2/1996
2 en Turboprop Engine - Fuel Nozzles and Manifold Adapters Inspection/Replacement of5/1/1998
1 en Turboprop Engine - Fuel Nozzles and Manifold Adapters Inspection/Replacement of5/1/1998
1 en Turboprop Engine - Oil Tank Filler Cap Inspection of5/27/2005
en Turboprop Engine - Fuel Pump, Coupling Shaft Spline - Inspection of3/2/2006
1 en Turboprop Engine - Bolts and Nuts of the FCU Connector Rod - Replacement of9/27/2007
en Turboprop Engine - Turboprop Engine with Hamilton Sunstrand Fuel Pump, Coupling Shaft Spline - Inspection of8/17/2012
2 en Turboprop Engine - Bolt of the FCU Connector Rod - Replacement of10/31/2007
en Turboprop Engine - PY and P3 Insulated Air Pressure Tubes - Inspection/Replacement of5/21/2010
en Turboprop Engine - Fuel Pump - Inspection/Replacement of12/19/2014
1 en Turboprop Engine; Inspection/Replacement of Bleed Off Valve (BOV) Cover12/2/1996
1 en Replacement/Modification of Propeller Governor7/11/2003
en Turboprop Engine - Fuel Pump - Inspection/Replacement of12/23/2014
19 en Turboprop Engine - Turbo Prop Engine Approved Listing of (Synthetic) Lubricating Oils5/11/2016
1 en Turboprop Engine - Power-Turbine Rotor Balancing Assembly - Replacement of4/12/1996
1 en Turboprop Engine - Inspection/Replacement of Bleed Off Valve (BOV) Cover12/2/1996
en Turboprop Engine - Main Oil Filter Patch - Inspection of12/8/2000
en Turboprop Engine - Fuel Pump - Inspection/Replacement of12/19/2014
en Turboprop Engine - Power Turbine Stator Housing - Inspection of3/20/2015
en Turboprop Engine - Electrical Oil-Level Filler-Cap and Indicator - Inspection/Replacement of5/1/2015
3 en Alert Turboprop Engine - Modification of Power Turbine Containment Ring1/27/2012
en Alert Turboprop Engine - Replacement of Oil Transfer Tube Adapter Retaining Ring11/8/2002
en Alert Turboprop Engine - Spark Igniters - Inspection of9/7/2007
en Alert Turboprop Engine - Fuel Control Unit (FCU) Manual Override (MOR) System - Inspection of3/7/2016
en Alert Turboprop Engine - Spark Igniters - Inspection of9/6/2007
en Alert Turboprop Engine - Second-Stage Power-Turbine Blades - Inspection/Replacement of2/13/2024
en Alert Turboprop Engine - Single-Engine Application First-Stage PT Blades - Inspection/Replacement of6/13/2024
en Alert Turboprop Engine - Second-Stage Power-Turbine Blades - Inspection/Replacement of2/13/2024
en Turboprop Engine - Ignition Cable Assembly - Inspection/Replacement of12/6/2022
8 en Turboshaft Engine Rotor Components - Service Life6/11/2003
4 en Turboshaft Engine - No. 9 & 10 Bearings, RGB Assembly - Replacement of12/29/2014
3 en Turboshaft Engine - No. 10 Bearing, RGB Assembly - Inspection of12/29/2014
1 en Turboshaft Engine - Fuel Control Unit - Replacement/Modification of12/13/2017
en Turboshaft Engine - Roller Bearing Option (IC), No. 9 and 10 Positions - Replacement of9/30/2016
5 en Turboshaft Engine - Replacement/Modification of Power Turbine Shaft Housing Assembly, No. 3 Bearing Seal Runner and Turbine Shaft Spacer, Turbine Exhaust Duct1/17/2013
3 en Alert Turboshaft Engine - Inspection of Retaining Ring, Power Turbine Baffle10/11/2012
en Alert Turboprop Engine - Second-Stage Power-Turbine Blades - Inspection/Replacement of2/13/2024
1 en Alert Turboprop Engine - Second-Stage Power-Turbine Blades - Inspection/Replacement of2/14/2024
1 en Turboprop Engine - Compressor Bleed Valve Assembly - Modification/Replacement of10/6/2021
3 en Turboprop Engine - P3 Probe Snorkel - Introduction of2/17/2022
en Alert Engine - Inspection of Shaft, Low Pressure Turbine (LPT) Eddy Current9/28/1990
3 en Engine - Blades, 9th Through 15th Stage High Pressure Compressor (HPC), Featuring Aluminum Oxide Blade Tips that Can Be Ground at Assembly7/1/1997
1 en Engine - Stator Set, 8th, 9th and 10th, 11th and 12th, and 13th and 14th Stage Compressor; with Aluminum Bronze Coating and Revised Rubstrip Machining11/23/1994
1 en Engine - Vane or Vane Cluster, 1st Stage High Pressure Turbine (HPT) & Duct, 1st Stage HPT Cooling - Modification of to Improve Compressor Surge Margin & Wear Resistance8/2/1996
1 en Engine - Blade, 13th, 14th and 15th Stage HPC - Replacement of with Blades that have Zirconium Oxide Tips to Improve Blade Durability6/30/1997
en Engine - Ring Segment and Vane Cluster and Seal, First Stage HPT Air - Modification of to Improve Low Cycle Fatigue of the Second Stage HPT Air Seal5/16/1997
en Engine - Seal, Air, Second Stage HPT - Incorporation of a More Durable Air Seal5/16/1997
en Engine - Disk, 4th Stage Low Pressure Turbine (LPT) - Reduced Cycle Life, Information Concerning - & Modification of, to Restore the Disk Cycle Life by Enlarging the Cooling Air Hole Area11/25/1997
2 en Engine - Introduction of the Advantage Performance Upgrade (APU) Configuration, to Improve High Pressure Turbine (HPT) Performance and Durability4/5/2011
1 en Engine - Seal, 13th, 14th, and 15th Stage, High Pressure Compressor (HPC) - Replacement of, and Introduction of a New Shot Peen Specification, to Improve Rear Drum Rotor Durability6/12/2012
en Engine - Disk Assembly, Drum Rotor, High Pressure Compressor (HPC) and Blade Locks, 14th, and 15th Stage - Introduction of, to Improve Durability12/7/2011
en Engine Fuel and Control - Fuel Nozzle and Support Assembly - Introduction of a New Fuel Nozzle and Support Assembly that does Not have a Brazed Inlet Fitting2/5/2018
en Engine Fuel and Control - Manifold Assembly, Supply, Fuel Nozzle (FS01 thru FS08) - Installation of New Hardware for Improved Durability11/8/2017
1 en Alert Engine - Air Seal (Rotating), HPT 2nd Stage - Inspection of for Cracks2/17/1998
1 en Alert Engine - Air Seal, 4th Stage Low Pressure Turbine (LPT) - Replacement or Modification of, to Reduce Heavy Rubs and Cracks5/2/2017
en Alert Engine - Disk Assembly, Drum Rotor, High Pressure Compressor (HPC) - Eddy Current and Ultrasonic Inspection of the 10th Stage Disk for Cracks8/20/2015
en Alert Air - Modification of Valve, High Pressure Compressor (HPC) Secondary Flow Control6/26/1990
en Engine - Blade Assembly, 1st Stage Low Pressure Compressor (LPC) - Inspection of the Blade Assembly and Lubrication of the Blade Shroud8/6/1996
en Engine - Blade Assembly, 1st Stage Low Pressure Compressor (LPC) - Inspection of the Blade Root Attachment Area for Cracks and Radius Dimension12/18/1996
en Engine - Blade, 1st Stage Low Pressure Compressor (LPC) - Replacement of or Modification of with Blade Featuring a Revised Airfoil Leading Edge and Platform4/24/1997
en Engine - Ring Segment and Vane Cluster and Seal, First Stage HPT Air - Modification of to Improve Low Cycle Fatigue of the Second Stage HPT Air Seal5/22/1997
en Engine - Seal, Air Second Stage HPT - Incorporation of a More Durable Air Seal5/22/1997
en Engine - Disk, 4th Stage Low Pressure Turbine (LPT) - Reduced Cycle Life, Information Concerning - and Modification of, to Restore the Disk Cycle Life by Enlarging the Cooling Air Hole Area11/12/1997
4 en Engine - Conversion of a PW4164, PW4168, or PW4168A Engine to a PW4164-1D, PW4168-1D, PW4168A-1D, or PW4170 Engine9/30/2011
1 en Engine - Seal, 13th, 14th, and 15th Stage, High Pressure Compressor (HPC) - Replacement of, and Introduction of a New Shot Peen Specification, to Improve Rear Drum Rotor Durability6/12/2012
en Engine - Disk Assembly, Drum Rotor, High Pressure Compressor (HPC) and Blade Locks, 14th, and 15th Stage - Introduction of, to Improve Durability11/15/2011
en Engine - Disk, 6th Stage Low Pressure Turbine (LPT) - Inspection for Suspect 6th Stage LPT Disks11/18/2014
1 en Engine Fuel and Control - Manifold Assembly, Supply, Fuel Nozzle (FS01 thru FS08) - Replace the Manifold Assemblies and Install New Hardware for Improved Durability4/24/2018
1 en Alert Power Plant - Bolts, Forward Mount Pylon - Inspection and Torque Check for Excess Stress11/24/1997
1 en Alert Powerplant - Engine Mount, Forward - Periodic Visual Inspection of the Primary Thrust Load Path12/9/1999
en Alert Power Plant - Bolts, Forward Mount Pylon - Inspection and Torque Check of the MP159 Material Bolts for Excess Stress12/9/1999
1 en Alert Engine - Air Seal (Rotating), HPT 2nd Stage - Inspection of for Cracks2/17/1998
en Alert Engine - Disk Assembly, Drum Rotor, High Pressure Compressor (HPC) - Eddy Current and Ultrasonic Inspection of the 10th Stage Disk for Cracks8/31/2015
1 en Alert Engine - Ring Segment, Assembly, Air Sealing, Low Pressure Turbine (LPT), 4th Stage - Replace the LPT 4th Stage Air Sealing Ring Segment Assemblies and Examine the LPT Case for Bulging9/3/2020
1 en Alert Engine Fuel and Control - Fuel Nozzle to Fuel Nozzle Supply Manifold Interface - Inspection for Fuel Leaks, Soot and Coke Formation, and Incorporation of an Increased Tube Coupling Nut (B-Nut) Torque2/12/2015
en Alert Engine Fuel and Control - Fuel Nozzle and Support Assembly - On-Wing Inspection for Fuel Leaks, Soot and Coke Formation, and Replacement/Repair of Suspect Nozzles; Replacement/Repair of Fuel Nozzles at Overhaul2/16/2016
en Alert Engine Fuel and Control - Nozzle and Support Assembly, Fuel - Replacement of3/10/2017
1 en Engine - Disk, 15th Stage High Pressure Compressor (HPC) - Repetitive Borescope Inspection or Eddy Current Inspection (ECI) for Cracks in the Front Rail of the Outer Rim7/1/2010
en Engine - Hub, Front, Turbine, Assembly of - Inspection of the Hub for a Mismatch (Step) on the Aft Side9/23/2016
7 en Alert Engine - Blade Assembly, 1st Stage, Low Pressure Compressor (LPC) - Thermal Accoustic Image (TAI) Inspection to Detect Airfoil Cracks9/6/2018
2 en Alert Engine - Air Seal Assembly, 2nd Stage High Pressure Turbine (HPT) - Inspection of the Seal for Cracks7/11/2013
en Alert Engine - Case Assembly, Diffuser Outer - Repetitive Inspection of Bosses for Cracks3/31/2017
4 en Alert Engine - Case Assembly, Diffuser Outer - Repetitive Inspection of Bosses for Cracks9/1/2022
en Alert Engine - Blade Assembly, 1st Stage, Low Pressure Compressor (LPC) - Ultrasonic Testing (UT) Inspection & Thermal Acoustic Image (TAI) Inspection of 1st Stage LPC Blade Assemblies to Find Airfoil Cracks10/15/2021
2 en Alert Engine - Hub Assembly, Low Pressure Compressor (LPC) - Do a Repetitive Eddy Current Inspection of LPC Hub Assembly Blade Slots for Cracks8/2/2023
en Alert Engine - Hub Assembly, Low Pressure Compressor (LPC) - Inspect the LPC Hubs, PN 51B821 and 52B521, for Cracks2/22/2018
5 en Nacelle - Exhaust - Inspection and Modification of Aft Cascade Support Frame Assembly - Thrust Reverser3/6/1996
2 en Nacelle - Inspection and Replacement of Forward Engine Mount - Link2/28/1992
1 en Nacelle - Power Plant - Inspection of Aft Engine Mount Beam and Link Assemblies7/25/1991
6 en Nacelle - Exhaust - Inspection and Modification of Aft Cascade Support Frame Assembly - Thrust Reverser3/6/1996
1 en Alert Nacelle - Inspection and Replacement of Powerplant - Engine Aft Mount Beam Assembly8/30/1995
en Engine - Rotor Assemblies - High Pressure Compressor (HPC) Rotor Nuts Replacement of, to Reduce Risk of Stress Corrosion at Titanium Rotor Disks3/5/2015
1 en Nacelle - Power Plant - Inspection of Aft Engine Mount Beam and Link Assemblies7/25/1991
2 en Nacelle - Inspection and Replacement of Forward Engine Mount - Link5/14/1992
1 en Alert Nacelle - Powerplant - Inspection and Replacement of Engine Aft Mount Beam Assembly8/30/1995
2 en Replacement/Rework of Engine Turbine/Turboprop Low Pressure Rotor Balancing Assembly11/25/1991
2 en Introduction of Turboprop Engine No. 5 Bearing Vent Tube Assembly12/9/1991
4 en Turboprop Engine - Introduction/Modification of Air Flow Directing Bracket Nozzle Assembly and Gas Generator Case2/1/1993
8 en Replacement of Turboprop Engine Fuel Manifold Transfer Tubes and Locking Plates4/4/1997
1 en Replacement/Introduction of Turboprop Engine Switching Valve-to-Rear Inlet Case Sealing Air Tube Assembly, Sealing Tube and Electrical Wiring Harness11/12/1991
en Replacement of Turboprop Engine Switching Valve-to-Rear Inlet Case Sealing Air Tube Assembly and Sealing Tube11/8/1991
en Replacement/Introduction of Turboprop Engine Switching Valve-to-Rear Inlet Case Sealing Air Tube Assembly, Sealing Tube and Wiring Harness12/16/1991
1 en Replacement/Introduction of Turboprop Engine Switching Valve-to-Rear Inlet Case Sealing Air Tube Assembly, Sealing Tube and Wiring Harness6/22/1992
en Introduction of Turboprop Engine Switching Valve-to-Rear Inlet Case Sealing Air Tube Assembly Fire Detector Wire Clamping Arrangement2/13/1992
1 en Replacement of Turboprop Engine Switching Valve-to-Rear Inlet Case Sealing Air Tube Assembly and Sealing Tube5/4/1992
4 en Modification of Turboprop Engine No. 5 Bearing Air System4/20/1995
1 en Replacement of Turboprop Engine Preformed Packings4/28/1995
3 en Replacement of Turboprop Engine Fuel Manifold Transfer Tube Lock Plate10/11/1996
en Replacement of Turboprop Engine Fuel Manifold Transfer Tubes8/14/1997
en Replacement of Turboprop Engine Fuel Manifold Drain Transfer Tube9/18/1997
2 en Turboprop Engine - Inspection/Replacement of First Stage Power Turbine Blades11/15/2012
3 en Turboprop Engine - Inspection/Replacement of First Stage Power Turbine Blades3/8/2013
en Turboprop Engine - Fuel Nozzle Configuration - Modification Requirements of11/21/2014
4 en Turboprop Engine - Replacement of Propeller Shaft3/16/2012
3 en Turboprop Engine - Inspection of Propeller Shaft3/21/2012
4 en Engine Turbine/Turboprop Rotor Components - Service Life11/21/1988
1 en Replacement of Engine Turbine/Turboprop Fuel Pump8/1/1990
en Replacement of Engine Turbine/Turboprop Cooling Air Nozzle Housing3/6/1989
2 en Modification of Turboprop Engine Cooling Air Nozzle Housing Assembly9/3/1991
2 en Modification of Engine Turbine/Turboprop High Pressure Turbine Front Cover8/20/1990
3 en Modification of Engine Turbine/Turboprop High Pressure Vane Ring Segments11/26/1990
3 en Modification of Engine Turbine/Turboprop Low Pressure Stator Assembly8/20/1990
en Replacement of Engine Turbine/Turboprop Front & Rear High Pressure Turbine Cover11/27/1989
1 en Re-Introduction of Engine Turbine/Turboprop Front and Rear High Pressure Turbine Covers2/25/1991
2 en Replacement of Engine Turbine/Turboprop High Pressure Turbine Vane Ring Segment Assembly2/11/1991
3 en Modification of Engine Turbine/Turboprop Cooling Air Nozzle Assembly4/8/1991
en Replacement of Engine Turbine/Turboprop High Pressure Vane Ring Segment Assembly2/19/1990
4 en Replacement of Engine Turbine/Turboprop R High Pressure Vane Ring Segment Assembly6/17/1991
3 en Modification of Engine Turbine/Turboprop Cooling Air Nozzle Assembly8/26/1991
1 en Replacement of Engine Turbine/Turboprop Fuel Pump Cover Assembly10/15/1990
en Replacement of Engine Turbine/Turboprop Fuel Pump Cover Assembly8/20/1990
2 en Turboprop Engine Turbomachinery Chip Detector Continuity and Circuitry Checks11/18/1991
2 en Replacement of Engine Turbine/Turboprop Fuel Pump5/13/1991
3 en Replacement/Modification of Turboprop Engine Switching Valve-to-Rear Inlet Case Sealing Air Tube Assembly and Sealing Tube10/15/1991
1 en Replacement of Engine Turbine/Turboprop Outer Vane Segment Housing Support and High Pressure Turbine Vane Ring Segment Assembly4/26/1991
2 en Replacement/Modification of Engine Turbine/Turboprop High Pressure Rotor Balancing Assembly and Cooling Air Nozzle Assembly7/8/1991
4 en Modification of Turboprop Engine Intercompressor Case Assembly12/9/1991
5 en Modification of Turboprop Engine Intercompressor Case Assembly8/10/1992
en Replacement of Engine Turbine/Turboprop High Pressure Turbine Front & Rear Covers4/29/1991
3 en Replacement of Turboprop Engine Intercompressor Case Assembly5/11/1992
4 en Replacement of Turboprop Engine Intercompressor Case Assembly8/10/1992
1 en Turboprop Engine - Re-Routing of Igniter Cable5/3/2012
1 en Turboprop Engine - Centrifugal Impeller - Replacement/Inspection of5/3/2016
en Turboshaft Engine Electronic Control5/3/1997
en Turboshaft Engine Data Collection Unit (DCU) Automatic Low Cycle Fatigue (LCF) Calculation - Verification of Bulletin Index Locator2/12/2004
2 en Alert Turboshaft Engine Automatic Low Cycle Fatigue (LCF) Calculation3/11/2004
4 en Alert Turboshaft Engine Compressor Turbine Disc Inspection of and Retaining Nut Replacement8/28/2007
2 en Alert Inspection/Reidentification of Turboshaft Engine PT Disk7/24/2012
1 en Alert Turboshaft Engine - HP Compressor Rotor and Impeller - Manual Calculation of Cycle Count3/26/2020
1 en Alert Turboshaft Engine - HP Compressor Rotor and Impeller - Manual Calculation of Cycle Count3/26/2020
3 en Turbofan Engine - Electronic Engine Control and Engine Diagnostic Unit - Replacement/Modification of3/15/2006
1 en Turbofan Engine - Engine Diagnostic Unit - Replacement/Modification of12/9/2005
1 en Turbofan Engine - Preformed Packing on Fuel and Oil Filters - Inspection of12/23/2005
en Turbofan Engine - Electronic Engine Control and Engine Diagnostic Unit - Replacement/Modification of11/24/2008
en Turbofan Engine - Alternator and Starter Seals - Replacement of5/20/2009
en Turbofan Engine - Electronic Engine Control and Engine Diagnostic Unit - Replacement/Modification of3/5/2015
2 en Turbofan Engine - Electronic Engine Control (EEC) and Engine Diagnostic Unit (EDU) - Replacement of / Modification of3/31/2018
1 en Turbofan Engine - Outer Electrical Wiring Harness - Inspection of3/7/2022
3 en Turbofan Engine - Combustion Chamber Outer Case Flange Bolts - Replacement of2/4/2022
2 en Turbofan Engine - Outer Combustion Case & Inner Bypass Duct Flange - Replacement / Modification of2/9/2022
3 en Turbofan Engine - Revision of N1 Trim Value for PW307A3/10/2016
en Turbofan Engine - Engine Electronic Control - Replacement/Modification of1/13/2016
en Turbofan Engine - First & Second Stage HPT Disks - Inspection of2/13/2023
en Replacement/Modification of Turbofan Engine Compressor Stator (2 Stg.) Assembly1/7/1998
2 en Replacement/Modification of Turbofan Engine Compressor Stator (2 Stg.) Assembly7/10/1998
en Turbofan Engine - Ignition Exciter - Replacement of; Ignition Exciter to Igniter Cable - Replacement of1/7/1998
1 en Turbofan Engine - Fan Inlet Case Abradable - Inspection of3/9/1998
1 en Turbofan Engine Second Stage HP Compressor Rotor Clearance - Borescope Inspection5/19/1998
2 en Turbofan Engine Second Stage HP Compressor Rotor Clearance - Borescope Inspection7/10/1998
en Turbofan Engine - Engine Electronic Control (EEC) - Replacement of8/14/1998
en Turbofan Engine - Fan Case Assembly - Replacement of11/12/1998
2 en Turbofan Engine - Fuel Control Unit (FCU) - Replacement/Modification of1/22/1999
1 en Turbofan Engine - Gaskets and Additional Washers for Front Fan Case Flange - Introduction of2/16/1999
1 en Turbofan Engine - Oil Level Indicator - Replacement of11/9/2000
en Turbofan Engine - Fuel Tube - Replacement of1/27/2000
1 en Turbofan Engine - Oil Filler Cap - Replacement of11/9/2000
1 en Turbofan Engine - Accessory Drive Gearshaft and Lip Seal - Replacement of6/1/2001
3 en Turbofan Engine - Bellows Seal for Cabin Bleed Air Tubes - Replacement of6/23/2004
1 en Turbofan Engine - Oil Leaks from No. 4 Bearing Pressure and Scavenge Transfer Tubes - Inspection of9/18/2001
en Turbofan Engine - Oil Leaks from No. 4 Bearing Pressure and Scavenge Transfer Tubes - Repair of9/18/2001
3 en Turbofan Engine - P3 Bellows Seals - Replacement of6/23/2004
4 en Turbofan Engine - New Fuel Manifold - Introduction of9/27/2006
5 en Turbofan Engine - New Fuel Manifold - Introduction of3/19/2007
en Turbofan Engine - Alternator Shaft Plain Seal - Replacement of1/9/2002
en Inspection of Turbofan Engine Fuel Tube5/24/2002
1 en Inspection of Turbofan Engine Fuel Tube7/29/2002
2 en Turbofan Engine - Alternator Shaft Plain Seal - Replacement of5/21/2004
2 en Turbofan Engine - Front-Fan-Case-Assembly Vibration Damper Ring - Installation of10/6/2004
en Turbofan Engine - Fuel Manifold - Inspection/Replacement of9/16/2003
1 en Turbofan Engine - No. 4 BRG Oil Pressure and Oil Scavenge Tubes - Replacement of1/19/2006
1 en Turbofan Engine - Fuel Pressure Tube Replacement and Attenuator Introduction of11/13/2003
1 en Turbofan Engine - Fuel Pressure Tube Replacement & Attenuator Introduction of2/4/2004
1 en Turbofan Engine - AC Alternator Drive Spur Gearshaft Assembly- Inspection of6/23/2004
2 en Turbofan Engine - Hydromechanical Fuel Control - Replacement/Modification of12/5/2005
2 en Turbofan Engine - Oil Tank Filler Cap - Inspection of12/5/2005
en Turbofan Engine - First Stage Low Pressure Turbine Blades - Inspection of5/16/2005
1 en Turbofan Engine - HFC Ratio Unit Setscrew Adjustment - Inspection of11/2/2005
1 en Turbofan Engine - Electronic Engine Control (EEC) - Replacement/Field Modification of11/3/2006
4 en Turbofan Engine - New Transfer Tubes with Heat Shield5/18/2007
en Turbofan Engine - HFC Ratio Unit Setscrew Adjustment - Inspection of2/20/2006
en Turbofan Engine - Fuel Pressure Hose & Tube Routing - Modification of6/5/2007
en Turbofan Engine - Gas-Generator-Case to Intermediate-Case Retaining-Bolts - Borescope - Inspection of7/13/2007
1 en Turbofan Engine - Gas-Generator-Case to Intermediate-Case Retaining-Bolts - Borescope - Inspection of1/21/2008
1 en Turbofan Engine - Electronic Engine Control (EEC) - Replacement/Modification of1/25/2008
en Turbofan Engine - Intermediate Case Grounding Terminal Stud Installation - Inspection of
2 en Turbofan Engine - Intercompressor-Bleed-Valve Servo Valve - Inspection2/16/2009
2 en Turbofan Engine - Fuel Manifold and Fuel Shut-Off Cable Grommets and Cover Plate Fairing / Replacement of8/6/2009
1 en Turbofan Engine - Turbine Exhaust Cone, Inner By-Pass Duct Assembly, Fuel Manifold, Fuel Shut-Off Cable Grommets and Cover Plate Fairing - Replacement/Modification of7/31/2009
en Turbofan Engine - Intercompressor-Bleed-Valve Servo Valve - Inspection of1/29/2009
1 en Turbofan Engine - Hydromechanical Fuel Control Unit - Replacement/Modification of1/28/2010
en Turbofan Engine - Intercompressor Bleed Valve / Servo-Valve - Replacement/Modification of6/29/2010
2 en Turbofan Engine - Electronic Engine Control / Replacement-Modification7/15/2011
2 en Turbofan Engine - Electronic Engine Control (EEC) - Replacement/Modification of7/12/2011
5 en Turbofan Engine - Electronic Engine Control (EEC) - Replacement/Modification of7/15/2015
1 en Turbofan Engine - Accessory Drive Lip Seal - Replacement of11/20/2012
3 en Turbofan Engine - Electronic Engine Control (EEC) - Replacement/Field Modification of7/15/2015
1 en Turbofan Engine - Gas Generator Case - Replacement/Modification of 2/5/2020
2 en Turbofan Engine - Gas Generator Case - Replacement of 11/17/2023
en Turbofan Engine - Gas Generator to Turbine Support Case Bolts - Inspection of 6/9/2023
2 en Alert Turbofan Engine - Fuel Control Unit - Deceleration Test8/23/1999
en Alert Turbofan Engine - Fuel Control Unit - Deceleration Test9/27/1999
en Alert Inspection of Turbofan Engine HFC Ratio Unit Setscrew Adjustment12/2/2003
1 en Alert Inspection of Turbofan Engine HFC Ratio Unit Setscrew Adjustment12/3/2004
en Alert Turbofan Engine New Fuel Manifold - Introduction of Bulletin Index Locator 73-10-049/27/2006
en Alert Turbofan Engine - New Fuel Manifold - Introduction of3/19/2007
1 en Alert Turbofan Engine - Intercompressor Bleed Valve/Servo-Valve - Inspection/Replacement of8/27/2010
en Turbofan Engine - Replacement of Combustion Chamber Liner Assembly6/1/2011
2 en Turbofan Engine - Engine Electronic Control - Replacement/Modification of8/30/2012
2 en Alert Turbofan Engine - Fuel Oil Heat Exchanger (FOHE) Fuel-Filter Bypass Valve - Replacement of12/1/2009
1 en Alert Turbofan Engine - Fuel Oil Heat Exchanger (FOHE) Fuel-Filter Bypass Valve - Replacement of1/7/2010
1 en Turbofan Engine - Electronic Engine Control (EEC) - Reprogramming/Replacement of1/11/2007
Iss 2 en Engine - Hub, HPC Front - Decrease in Certified Life of the HPC Front Hub5/10/2019
en Engine - Module, Low Pressure Compressor (LPC) - Repetitive Borescope Inspection of the LPC Module9/23/2019
en Engine - Hub, HPC Front - Decrease in Certified Life of the HPC Front Hub4/2/2019
en Engine - Module, Low Pressure Compressor (LPC) - Repetitive Borescope Inspection of the LPC Module9/23/2019
Iss 2 en Alert Engine - Hub, High Pressure Turbine (HPT), 1st & 2nd Stage - Inspection of HPT 1st & 2nd Stage Hubs for Manufacturing Anomaly11/30/2023
Iss 4 en Alert Engine - Disk, High Pressure Compressor (HPC), 8th Stage - Do an Inspection of HPC 8th Stage Disk for Material Anomalies11/30/2023
en Alert Engine - Disk, High Pressure Compressor (HPC) 8th Stage - Do a Repetitive Angled Ultrasonic Scan Inspection of HPC 8th Stage Disk for a Material Anomaly11/30/2023
en Alert Engine - Hub, High Pressure Turbine (HPT), 1st & 2nd Stage - Do a Repetitive Angled Ultrasonic Scan Inspection of HPT 1st & 2nd Stage Hubs for a Manufacturing Anomaly11/30/2023
Iss 2 en Alert Engine - Rotor, HPC, Axial, 7th Stage - Do an Inspection of HPC 7th Stage Axial Rotor for Material Anomalies5/22/2024
Iss 2 en Alert Engine - Rotor, High Pressure Compressor (HPC), Axial, 7th Stage - Do a Repetitive Angled Ultrasonic Scan Inspection of HPC 7th Stage Axial Rotor for a Material Anomaly8/1/2024
en Engine - Bearing, Ball - Inspection & Replacement of Suspect No. 3 Ball Bearing for Spalling3/15/2022
Iss 2 en Alert Engine - Hub, High Pressure Turbine (HPT), 1st & 2nd Stage - Inspection of HPT 1st & 2nd Stage Hubs for Manufacturing Anomaly11/30/2023
Iss 4 en Alert Engine - Disk, High Pressure Compressor (HPC), 8th Stage - Do an Inspection of HPC 8th Stage Disk for Material Anomalies11/30/2023
en Alert Engine - Disk, High Pressure Compressor (HPC) 8th Stage - Do a Repetitive Angled Ultrasonic Scan Inspection of HPC 8th Stage Disk for a Material Anomaly11/30/2023
en Alert Engine - Hub, High Pressure Turbine (HPT), 1st & 2nd Stage - Do a Repetitive Angled Ultrasonic Scan Inspection of HPT 1st & 2nd Stage Hubs for a Manufacturing Anomaly11/30/2023
Iss 2 en Alert Engine - Rotor, HPC, Axial, 7th Stage - Do an Inspection of HPC 7th Stage Axial Rotor for Material Anomalies5/22/2024
Iss 2 en Alert Engine - Rotor, High Pressure Compressor (HPC), Axial, 7th Stage - Do a Repetitive Angled Ultrasonic Scan Inspection of HPC 7th Stage Axial Rotor for a Material Anomaly8/1/2024
Iss 6 en Oil - Cooler, Fuel Oil - Replace or Modify the Fuel Oil Cooler to Stop Potential Oil Leaks3/20/2019
Iss 6 en Oil - Cooler, Fuel Oil - Replace or Modify the Fuel Oil Cooler to Stop Potential Oil Leaks3/20/2019
Iss 2 en Engine - Vanes, High Pressure Turbine (HPT) 2nd Stage and Air Seal, Diffuser Case and Hub, High Pressure Compressor (HPC) Rear - Inspection of HPC Rear Hub and Replacement of Diffuser Case Air Seal and HPT 2nd Stage Vanes to Modify Airflow6/15/2018
Iss 2 en Engine - Fan Hub Assembly - Inspection of the Fan Hub Assembly for Damage5/31/2018
en Alert Engine - Hub, Front, High Pressure Compressor (HPC) and Gear, No. 3 Bearing Bevel - Decrease of the HPC Front Hub Life and Replacement of the Hub and Gear to Improve HPC Durability5/15/2018
en Engine - Gearshaft, Integrated Drive Generator (IDG), Oil Pump Drive, Assembly - Replace the IDG Oil Pump Drive Gearshaft Assembly to Improve Main Gearbox Durability4/18/2019
Iss 4 en Engine - Seal, Air, Turbine Stator Intermediate, Outer Rear - Examine the Turbine Stator Intermediate Outer Rear Air Seal Shiplap for Wear2/14/2020
Iss 2 en Engine - Hub, High Pressure Turbine (HPT), 1st & 2nd Stage - Inspection of HPT 1st & 2nd Stage Hubs for a Manufacturing Anomaly7/8/2022
Iss 2 en Alert Engine - Rotor, High Pressure Compressor (HPC) 2nd & 4th Stage - Inspection & Repair of Parts, which have been Cleaned with SPOP18 or Equivalent without Masking1/18/2024
Iss 2 en Alert Engine - Hub, High Pressure Compressor (HPC) Rotor, Rear - Inspection & Repair of HPC Rear Hub Rotors with a New Honeycomb6/20/2023
en Alert Engine - Rotor, High Pressure Compressor (HPC), 7th Stage, Compressor Rotor, HPC, 8th Stage, & Hub, Rear, HPC Rotor - Repetitive Inspection for a Manufacturing Anomaly & Part Life Retirement Limits11/3/2023
Iss 2 en Alert Engine - Hubs, High Pressure Turbine (HPT), 1st and 2nd Stage - Repetitive Angled Ultrasonic Scan Inspection & Part Life Retirement Limits of HPT 1st & 2nd Stage Hubs12/12/2023
en Engine Fuel and Control - Control, Electronic Engine (EEC), and Prognostics and Health Management Unit (PHMU) - Incorporation of FCS5.0 Software5/28/2019
2 en Modification of Engine - Case and Vane Assembly, High Pressure Turbine (HPT)9/27/1988
3 en Modification of Engine - Case and Vane Assembly, High Pressure Turbine (HPT)5/30/1989
en Engine - Second Stage Turbine Rotor Assembly, Hub Assembly, and Blade Assembly - High Pressure Turbine (HPT) - Inspection and Modification to Improve Life3/13/1992
1 en Engine - Second Stage Turbine Rotor Assembly, Hub Assembly, and Blade Assembly - High Pressure Turbine (HPT) - Inspection and Modification to Improve Life3/26/1992
2 en Engine - Second Stage Turbine Rotor Assembly, Hub Assembly, and Blade Assembly - High Pressure Turbine (HPT) - Inspection and Modification to Improve Life4/7/1992
3 en Engine - Second Stage Turbine Rotor Assembly, Hub Assembly, and Blade Assembly - High Pressure Turbine (HPT) - Inspection and Modification to Improve Life5/29/1992
4 en Engine - Second Stage Turbine Rotor Assembly, Hub Assembly, and Blade Assembly - High Pressure Turbine (HPT) - Inspection and Modification to Improve Life8/28/1992
en Engine - Blade, Second Stage High Pressure Turbine (HPT) - Inspection of Platform Radius and Verification of Relief (Scarf) Cut9/30/1993
en Engine - Disk Assembly, First Stage High Pressure Turbine (HPT) - Eddy Current Inspection (ECI) of Blade Attachment Area2/17/1997
1 en Engine - Disk Assembly, First Stage High Pressure Turbine (HPT) - Eddy Current Inspection (ECI) of Blade Attachment Area3/31/1997
en Engine - Disk, 1st Stage High Pressure Turbine, and Hub, 2nd Stage High Pressure Turbine - Repetitive Inspection of for Possible Material Surface Anomalies1/4/1999
1 en Engine - Diffuser Case and High Pressure Turbine Case - One-Time Eddy Current Inspection for Cracks8/30/2013
1 en Alert Engine - Replacement of Plate Assembly, First Stage Turbine Blade Front Blade Retaining4/25/1986
2 en Alert Engine - Replacement of Plate Assembly, First Stage Turbine Blade Front Blade Retaining7/17/1986
3 en Alert Engine - Replacement of Plate Assembly, First Stage Turbine Blade Front Blade Retaining11/7/1986
4 en Alert Engine - Replacement of Plate Assembly, First Stage Turbine Blade Front Blade Retaining6/18/1987
3 en Alert Engine - Inspection of Airseal Assembly, High Pressure Turbine (HPT) 2nd Stage4/13/1989
4 en Alert Engine - Inspection of Airseal Assembly, High Pressure Turbine (HPT) 2nd Stage9/20/1989
2 en Alert Engine - Rotor and Stator Assembly, High Pressure Turbine (HPT) - Incorporation of Airflow Modification for Improved Cooling Air Management for the 2nd Stage Blade Rear Retaining Plate Assembly5/10/1988
3 en Alert Engine - Rotor and Stator Assembly, High Pressure Turbine (HPT) - Incorporation of Airflow Modification for Improved Cooling Air Management for the 2nd Stage Blade Rear Retaining Plate Assembly8/25/1988
4 en Alert Engine - Rotor and Stator Assembly, High Pressure Turbine (HPT) - Incorporation of Airflow Modification for Improved Cooling Air Management for the 2nd Stage Blade Rear Retaining Plate Assembly11/9/1988
5 en Alert Engine - Second Stage Turbine Rotor Assembly, Hub Assembly, and Blade Assembly - High Pressure Turbine (HPT) - Inspection and Modification to Improve Life5/28/1994
6 en Alert Engine - Second Stage Turbine Rotor Assembly, Hub Assembly, and Blade Assembly - High Pressure Turbine (HPT) - Inspection and Modification to Improve Life7/9/1996
en Alert Engine - Disk Assembly, First Stage High Pressure Turbine (HPT) - Modification of Front and Rear Sideplate Snap Radii3/18/1997
1 en Alert Engine - Diffuser Case Assembly - Repetitive Eddy Current Inspection for Cracks7/13/2016
2 en Alert Engine - Diffuser Case Assembly - Repetitive Eddy Current Inspection for Cracks8/12/2016
4 en Alert Engine - Diffuser Case Assembly - Repetitive Eddy Current Inspection for Cracks2/25/2018
2 en Alert Engine - Hub Assembly, Turbine & Blade Assembly, HPT, 2nd Stage - Do an Inspection of Turbine Hub Assembly and HPT 2nd Stage Blade Assembly4/11/2023
en Alert Engine Fuel and Control - Control, Electronic Engine (EEC) (EEC104-40 and EEC104-60) with SCN 5B/I Software - Replacement or Modification of7/14/2016
en Alert Engine Fuel and Control - Control, Electronic Engine (EEC) - Replacement or Modification of the EEC to Incorporate SCN 27A Software3/24/2017
en Alert Engine Fuel and Control - Fuel Control, Main - Inspection of Suspect Main Fuel Control10/16/2017
en Alert Engine - Revision of Clamping Configuration, Compressor and Turbine Case Cooling Air Valve Tubes10/28/1987
Service Information Letters
NameRevisionLangSubjectDate
en Sulphidation Attack10/29/1987
en Chip Detector Functional Test2/21/1989
en Alert Fuel Nozzle Adapter & Sheath Distortion9/26/1989
1 en Improved Power Turbine Blade Commercial Support Plan 91C-576/15/1992
en Proventive Periodic Maintenance Fuel Control Drivebody Inspection/Driveshaft Bearing Replacement4/21/1993
1 en Inspection for Compressor Turbine Blade Exceeding 2500 Hours12/23/1992
en Findings Related to the PT6A-114 Compressor Turbine Blade Inspection Program and Upcoming Improvements12/23/1992
en Sulphidation Attack10/29/1987
en Chip Detector Functional Test2/21/1989
en Alert Fuel Nozzle Adapter & Sheath Distortion9/26/1989
en Proventive Periodic Maintenance Fuel Control Drivebody Inspection/Driveshaft Bearing Replacement4/21/1993
en Sulphidation Attack10/29/1987
en Alert Power Section Decoupling, Oil Filter and Chip Detector Inspection10/20/1988
en Alert Fuel Nozzle Adapter & Sheath Distortion9/26/1989
en Sulphidation Attack10/29/1987
en Alert Fuel Nozzle Adapter & Sheath Distortion9/26/1989
en JT15D No. 4 Bearing Housing Security5/6/1980
en Gas Generator Case in-Situ Inspection10/10/1985
en JT15D-4B Minimum Fuel Flow Adjustment10/22/1986
en Sulphidation Attack10/29/1987
en Low Compressor in-Situ Inspection10/11/1988
revised en Oil Filler Neck Assembly6/14/1989
en Bird Strike Incident Reports2/27/1990
en Oil Discoloration7/13/1990
1 en High Pressure Turbine Blade Shift5/8/1991
1 en Low Pressure Compressor Stator Retaining Rivets3/4/1991
en Gas Generator Case in-Situ Inspection12/17/1990
2 en Automatic Fuel Shut-Off Control Wire Rope & Linkage11/26/1992
en High Pressure Turbine Blade Shift4/26/1991
1 en Hot Section Durability Improvements5/5/1992
en JT15D-4 Turbine Exhaust Duct5/7/1992
1 en Flow Divider Valve (FDV)6/27/1994
en Alert Fuel Nozzle Adapter & Sheath Distortion9/26/1989
en Alert Fuel Nozzle Adapter & Sheath Distortion9/26/1989
en Sulphidation Attack10/29/1987
en Alert Fuel Nozzle Adapter & Sheath Distortion9/26/1989
en Sulphidation Attack10/29/1987
en Chip Detector Functional Test2/21/1989
en Alert Fuel Nozzle Adapter & Sheath Distortion9/26/1989
en Proventive Periodic Maintenance Fuel Control Drivebody Inspection/Driveshaft Bearing Replacement4/21/1993
en Sulphidation Attack10/29/1987
en Chip Detector Functional Test2/21/1989
en Alert Fuel Nozzle Adapter & Sheath Distortion9/26/1989
en Chip Detector Functional Test2/21/1989
en Alert Fuel Nozzle Adapter & Sheath Distortion9/26/1989
1 en Use of Dyes in Oil and Fuel Systems7/6/1990
en Alert Oil Filler Cap Security6/21/1990
en Fuel Nozzle Maintenance: A. Introduction of Fuel Nozzle in Situ Cleaning B. Fuel Nozzle Cleaning/Refurbishment Interval C. Operation and Maintenance Recommentation3/11/1994
en P&WC'S 24-Hour Global Service - Customer First Centre Revamped Telephone Menu11/9/1998
4 en P&WC'S 24-Hour Global Service - Customer First Centre Revamped Telephone Menu7/12/2013
1 en Stolen Parts11/10/2012
3 en Engine Maintenance at Other than Pratt & Whitney Canada Corp. ("P&WC") Recommended Time Between Overhaul ("TBO")/Hot Section Inspection ("HSI") Intervals and the Effect on Warranty11/10/2012
3 en Use of Non Pratt & Whitney Canada (P&WC) Supported Parts or Non P&WC Approved Repair Schemes11/10/2012
en Replacement of Exxon Turbine Oils by Air BP Oils3/19/2001
1 en Pratt & Whitney Canada (P&WC) Corp. (P&WC) Customer Training Collaborative Agreement with Flight Safety International (FSI)9/12/2012
1 en Installation of O-Ring in Oil Filter Groove2/19/2013
en Changes Coming to Technical Publications3/19/2012
en Qualified Engine Oil Analysis Laboratory List1/21/2013
1 en Qualified Engine Oil Analysis Laboratory List8/16/2013
2 en Qualified Engine Oil Analysis Laboratory List12/9/2013
en Material Test Result Findings from Supplier: Carmel Forge3/1/2013
en Discontinued Electronic Bulletin Email Delivery Subscriptions7/2/2013
en Technical Publication Revision Status11/12/2013
en Handling of Suspected Hexavalent Chromium Residue on Engine Parts During Maintenance, Repair, and Overhaul7/20/2020
en Occasional Dust Plume Exposure6/30/2020
en Alert Accessory Gearbox Coupling Shaft Ball Lock Inspection - PT6 Engines7/13/1989
1 en Use of Dyes in Oil and Fuel Systems7/6/1990
en #1 Bearing Electrical Discharge Damage (EDD)5/25/2007
en Use of Cleaning Procedures and Products on Assembled Compressor Turbine Disk and Blades1/17/2014
1 en Hybrid Fuel Nozzles Service Bulletin 7493/7526 Carbon Contamination10/21/1999
en FCU Metering Valve (SB 7458) Clarification6/28/1996
en No Response to Power Lever Movement3/8/1999
en Replacement of Oil Pump Plug1/18/1999
en JT15D-5 Limited Engine Response to Power Lever Movement1/18/1999
1 en Third Stage Compressor Stator Airfoil Fractures6/9/1995
en Clarification of B.O.V. Installed on PT6A-114/114A Engines6/13/1995
1 en Clarification of B.O.V. Installed on PT6A-114/114A Engines3/26/1999
1 en Combustion Chamber Dome Bulging7/18/1996
en SB1538/SB3344/SB4204/SB12134/SB13287/SB14251 One Time Inspection of Compressor Bleed Valve11/27/1996
6 en TBO Escalation Process through Sampling5/9/2013
1 en Emergency Power Lever (EPL)/Fuel Control Manual Override System8/9/2000
2 en Emergency Power Lever (EPL)/Fuel Control Manual Override System1/8/2004
2 en SB1555R2/SB3351R2/SB4209R1/SB12147R1/SB13307R2/SB14268R15/13/1998
1 en SB1558/SB3353/SB4211/SB12148/SB13310/B14270 - One Time Inspection of Simplex Fuel Manifold Assemblies5/13/1998
en BOV Diaphragm Wear on PT6A-114A and PT6A-25C Engines6/19/1998
en SB1570/SB12158/SB10307 - No.1 Bearing Outer Housing11/20/1998
en Inspection of Second Stage PT Blades Pre/Post 141725/14/1999
en Fuel Pumps3/3/2000
1 en Fees Applicable to TBO Extension Recommendations5/9/2013
en PT6A-42A, Premature Wear at the Aluminum Bushing and Magnesium Housing of the Main Oil Pressure Pump12/18/2001
1 en PT6A-67D, Oil Discoloration10/29/2004
1 en Borescope Inspection in Conjunction with Fuel Nozzle Check5/2/2006
2 en Borescope Inspection in Conjunction with Fuel Nozzle Check4/1/2008
3 en Borescope Inspection in Conjunction with Fuel Nozzle Check7/3/2013
1 en Web-Based Engine Condition Trend Monitoring (WebECTM®) Services9/26/2006
en PT6A Compressor Turbine (CT) Blade Fractures1/21/2004
en Warranty Coverage for Main Oil Pressure (MOP) Pump Events Occurring Beyond the Basic Warranty Period3/8/2005
en Compressor and Turbine Washes as an Effective Means of Preventative Maintenance7/31/2006
2 en Compressor and Turbine Washes as an Effective Means of Preventative Maintenance3/16/2010
en PT6A-114 & -114A Compressor Turbine Blade Maintenance10/25/2006
1 en PT6A-114 & -114A Compressor Turbine Blade Maintenance7/3/2013
en Cleanable Filters Part Marked "Noncleanable"8/27/2007
3 en Maintenance of Engine Fuel Pump Drive and Coupling Shaft Assembly8/23/2012
4 en Maintenance of Engine Fuel Pump Drive and Coupling Shaft Assembly5/15/2013
en Commercial Support Program for New Compressor Turbine Blades6/9/2009
1 en Commercial Support Program for New Compressor Turbine Blades7/3/2013
2 en Commercial Support Program for New Compressor Turbine Blades8/29/2013
en 2012 PT6A Customer Days and PT6A Events6/11/2012
en Removal of HTS Oils from the Approved Listing of Lubricating Oils7/11/2012
1 en Removal of HTS Oils from the Approved Listing of Lubricating Oils12/10/2013
en Price Reduction of Platinum Aluminide Coated Compressor Turbine Blade for Small PT6As11/16/2012
en Migration ot Technical Publications Online4/8/2013
en Recommended Maintenance following Engine-Mounted Starter/Generator Faults4/3/2013
en Compressor and Turbine Washes as an Effective Means of Preventative Maintenance3/18/2013
en 2013 PT6A Customer Days and PT6A Events5/21/2013
1 en 2013 PT6A Customer Days and PT6A Events9/10/2013
en Oil Discoloration7/5/2013
en Scavenge Pump Inlet Screen Inspection8/8/2013
1 en FASTTM System Activation5/23/2014
en Fuel Control Unit (FCU) Health Monitoring8/29/2014
en Fuel Nozzle Tip Assembly Replacement12/9/2014
en Chip Detector Functional Test2/21/1989
en PW100 Gas Generator Case Drain Valve Connection One Time Inspection6/18/1997
en PW306C Accessory Gearbox Starter and Alternator Pad Magnetic Seal Inspection/Replacement5/25/2006
en Reported Loss of Thrust Control during Landing Incident - PW306C9/19/2007
en PW530A Engine Second Stage High Pressure Compressor Rotor - Borescope Inspection6/8/1998
en PW545A Fan Case Extension Cracking4/10/2003
en PW500 High ITT6/30/2003
en T1-FCU Sensor and FCU Acceleration Adjustment11/12/2003
en PW535A Field events of Engine Fire9/27/2006
2 en PW500 Hydromechanical Fuel Control Unit1/22/2010
Service Letters
NameRevisionLangSubjectDate
en Sub-Idle Operation in Descent10/31/1983
Spare Parts Bulletins
NameRevisionLangSubjectDate
1 en Turboprop Engine - Repair Parts for the Gas Generator Diffuser Exit Tubes - Introduction of3/22/2013
en Turboprop Engine - Fuel Filter Replacement Parts Kit - Replacement of12/16/2013
en Turboprop Engine - Metal Shipping Container - Introduction of12/13/2013
Special Instructions
NameRevisionLangSubjectDate
en Front End Oil Leakage - Procedure to Establish Source of Leakage on PT6A-6 thru -36 and PT6A-110 thru -135 Incorporating Propeller Shaft Oil Seal Retaining Ring with Drain Channel4/16/1984
en Establishment of Sufficient Clearance between Main Body Assembly and Fuel Outlet Body for Fuel Control Unit DP-L2 - Engine JT15D-1 and JT15D-49/20/1974
en Inspection of Fuel Control Drive Gear-Oil Supply Hole PT6A-6/6A/6B/20/27 and 28 Engines Equipped with Pesco Fuel Pumps7/14/1970
en Field Management Plan for GMS HPT Disks with Possible Low Creep Properties11/30/2012
A en Field Management Plan for GMS HPT Disks with Possible Low Creep Properties5/17/2016
en Cool Bodie Test Procedures for Engine Surge Margin Diagnostic Testing1/10/1996
en Propeller Shaft Oil Seal - Provision of Additional Support PT6A-6 thru -36 and -110 thru -135 Incorporating the Intent of Service Bulletin No. 12279/10/1982
2 en PW500 Auto Shut-off Mechanism Inspection8/23/2005
en PW545A ITT Trimming Procedure7/18/2005
en Instructions for Regular Operation into Zone 2 Areas Containing Low Concentrations of Volcanic Ash4/21/2010
en Inspection and Replacement of External Scavenge Pump Retaining Nut Lock Washers12/29/1987
en Accessory Gearbox Coupling Shaft Locking Ball and Spring - Replacement of Specified PT6A Engines7/13/1989
en Sundstrand Fuel Pump, Inspection of Units Installed on All PT6 Engine Installations11/16/1988
en Cold Engine Fuel Spiking Diagnostic Testing with Electronic Engine Control (EEC), PN 500341-5KX02 or PN 530063-SK07 Equipment4/13/1999
en "E1E" Procedure for Engine Surge Margin Diagnostic Testing8/9/1996
en PT6A-114A & PT6A-34 - Inspect Bleed Off Valve8/31/2011
en Modification of Main Fuel Control10/7/1983
en V2500 High Pressure Turbine Hubs - Require Removal5/24/2021
en V2500 High Pressure Turbine Hubs - Require Removal5/24/2021
en PW1100G-JM/PW1400G-JM HPT Hub Time of Flight Removal for Ausi8/4/2023
en Hub, High Pressure Turbine (HPT), Stage 1 & 2 - Inspection & Replacement11/20/2023
en PW1100G-JM HPT Hub Time of Flight Removal for AUSI11/3/2023
B en PW1100G-JM Powdered Metal Part Exemptions List3/1/2024
A en PW1500G & PW1900G High Pressure Turbine (HPT) Hub Time of Flight (TOF) Removal2/7/2024
en No 3 Bearing Replacement for Suspect Lot12/17/2021
A en PW4000-112 Air/Oil Heat Exchanger Special Inspection2/15/2022
Temporary Revisions
NameRevisionLangSubjectDate
en To Revise Replacement Interval for Flexible Fuel Tube10/28/2002
en To Revise Replacement Interval for Flexible Fuel Tube10/28/2002
en Scheduled Maintenance Checks10/28/2002
en Add Testing-203/15/1999
en Add Testing-203/15/1999
en Add Testing-203/15/1999
en Engine General - Cleaning/Painting11/11/1983
en Engine, Turbine, Inspection8/19/1985
en Engine, Turbine, Inspection8/20/1985
en Engine: Turbine - Inspection1/16/1991
en Engine: Turbine - Maintenance Practices1/16/1991
en Fuel Nozzle and Support - Cleaning/Painting2/14/1985
Miscellaneous
NameRevisionLangSubjectDate
en Cactus Correspondence: Fuel Spike Test Program9/2/1993
A en Engineering Authorization: Borescope Inspect HPC STG 7 IBR Aft Integral Arm for Cracks - Split Case3/24/2015
D en FAST/DTU SIM Card Specifications for Cellular Carrier ((Form))