The Aviation DataBase: Service Information: Enstrom Helicopter
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Flight Manuals
NameRevisionLangSubjectDate
12 en F-28A3/28/2017
9 en 2803/28/2017
9 en 280C3/28/2017
17 en F-28F10/18/2024
17 en F-28F10/18/2024
8 en 280F8/16/2017
9 en 280F9/12/2024
9 en 280F9/12/2024
11 en 280FX9/20/2017
12 en 280FX12/3/2018
13 en 280FX7/16/2020
13 en 280FX7/16/2020
14 en 280FX10/18/2024
14 en 280FX
20 en 4805/19/2016
21 en 48010/9/2019
21 en 48010/9/2019
en 480B8/12/2020
Illustrated Parts Catalogs
NameRevisionLangSubjectDate
10 en 1987 Edition - F-28A, 280, F-28C, 280C, F-28F, 280F and 280FX11/8/2023
10 en 1987 Edition - F-28A, 280, F-28C, 280C, F-28F, 280F and 280FX11/8/2023
11 en 1987 Edition - F-28A, 280, F-28C, 280C, F-28F, 280F and 280FX4/16/2024
11 en 1987 Edition - F-28A, 280, F-28C, 280C, F-28F, 280F and 280FX4/16/2024
12 en 1987 Edition - F-28A, 280, F-28C, 280C, F-28F, 280F and 280FX8/29/2024
12 en 1987 Edition - F-28A, 280, F-28C, 280C, F-28F, 280F and 280FX8/29/2024
2 en 1987 Edition - F-28A, 280, F-28C, 280C, F-28F, 280F and 280FX4/28/2000
3 en 1987 Edition - F-28A, 280, F-28C, 280C, F-28F, 280F and 280FX9/30/2013
3 en 1987 Edition - F-28A, 280, F-28C, 280C, F-28F, 280F and 280FX9/30/2013
4 en 1987 Edition - F-28A, 280, F-28C, 280C, F-28F, 280F and 280FX3/24/2017
4 en 1987 Edition - F-28A, 280, F-28C, 280C, F-28F, 280F and 280FX3/24/2017
5 en 1987 Edition - F-28A, 280, F-28C, 280C, F-28F, 280F and 280FX5/9/2018
5 en 1987 Edition - F-28A, 280, F-28C, 280C, F-28F, 280F and 280FX5/9/2018
5 en 1987 Edition - F-28A, 280, F-28C, 280C, F-28F, 280F and 280FX5/9/2018
6 en 1987 Edition - F-28A, 280, F-28C, 280C, F-28F, 280F and 280FX4/22/2019
6 en 1987 Edition - F-28A, 280, F-28C, 280C, F-28F, 280F and 280FX4/22/2019
7 en 1987 Edition - F-28A, 280, F-28C, 280C, F-28F, 280F and 280FX8/21/2019
7 en 1987 Edition - F-28A, 280, F-28C, 280C, F-28F, 280F and 280FX8/21/2019
9 en 1987 Edition - F-28A, 280, F-28C, 280C, F-28F, 280F and 280FX5/17/2023
9 en 1987 Edition - F-28A, 280, F-28C, 280C, F-28F, 280F and 280FX5/17/2023
10 en 2001 Edition - TH-28, 480 and 480B12/20/2013
11 en 2001 Edition - TH-28, 480 and 480B12/15/2015
11 en 2001 Edition - TH-28, 480 and 480B10/30/2015
12 en 2001 Edition - TH-28, 480 and 480B9/2/2016
13 en 2001 Edition - TH-28, 480 and 480B5/9/2018
13 en 2001 Edition - TH-28, 480 and 480B5/9/2015
14 en 2001 Edition - TH-28, 480 and 480B9/27/2018
14 en 2001 Edition -TH-28, 480 and 480B9/27/2018
15 en 2001 Edition - TH-28, 480 and 480B12/3/2019
15 en 2001 Edition - TH-28, 480 and 480B12/3/2019
16 en 2001 Edition - TH-28, 480 and 480B7/22/2020
16 en 2001 Edition - TH-28, 480 and 480B7/22/2020
17 en 2001 Edition - TH-28, 480 and 480B11/28/2022
17 en 2001 Edition - TH-28, 480 and 480B11/28/2022
18 en 2001 Edition - TH-28, 480 and 480B5/28/2024
18 en 2001 Edition - TH-28, 480 and 480B5/28/2024
4 en 2001 Edition - TH-28, 480 and 480B10/15/2010
4 en 2001 Edition - TH-28, 480 and 480B9/2/2010
4 en 2001 Edition - TH-28, 480 and 480B4/30/2010
5 en 2001 Edition - TH-28, 480 and 480B6/21/2011
5 en 2001 Edition - TH-28, 480 and 480B1/20/2011
5 en 2001 Edition - TH-28, 480 and 480B12/15/2010
6 en 2001 Edition - TH-28, 480 and 480B9/9/2011
6 en 2001 Edition - TH-28, 480 and 480B7/29/2011
7 en 2001 Edition - TH-28, 480 and 480B1/30/2012
8 en 2001 Edition - TH-28, 480 and 480B7/31/2012
9 en 2001 Edition - TH-28, 480 and 480B2/1/2013
Illustrated Tool Catalogs
NameRevisionLangSubjectDate
en Piston & Turbine3/30/2010
4 en Piston & Turbine1/1/2016
5 en Piston & Turbine9/1/2016
6 en Piston & Turbine1/1/2017
en Piston & Turbine7/1/2018
en Piston & Turbine12/1/2021
Maintenance Alerts
NameRevisionLangSubjectDate
en F-28/280 Series: Mount Cabin Seat LT8/3/2015
en F-28/280 Series: Pilot Collective Socket12/17/2014
en TH-28/480 Series: Oil Cooler Bearing Support12/19/2014
Maintenance Manual Supplements: F-28/280 Series
NameRevisionLangSubjectDate
7 en Avionic Systems8/28/2017
7 en Avionic Systems8/28/2017
8 en Avionic Systems1/15/2019
8 en Avionic Systems1/15/2019
9 en Avionic Systems4/30/2020
9 en Avionic Systems4/30/2020
Maintenance Manual Supplements: TH-28/480 Series
NameRevisionLangSubjectDate
8 en 480/480B Air Conditioning System P/N 4220176-( )5/1/2017
3 en Emergency Pop Out Floats3/21/2016
1 en Chelton Flight Systems FlightLogic Electronic Flight Instrument System (EFIS) P/N 4220500-( )11/9/2010
15 en Avionic Systems8/15/2018
15 en Avionic Systems8/15/2015
16 en Avionic Systems5/7/2019
17 en Avionic Systems5/23/2019
18 en Avionic Systems4/30/2020
18 en Avionic Systems4/30/2020
en Partial Wide Instrument Panel11/15/2010
en Bambi Bucket Interface Kit P/N 4220130-14/30/2013
2 en G1000H Integrated Flight Deck System10/18/2019
2 en G1000H Integrated Flight Deck System10/18/2019
Maintenance Manuals
NameRevisionLangSubjectDate
en 280 Series1/1/1977
revised en F-28A Series9/1/1975
11 en F-28F/280F Series10/25/2019
11 en F-28F/280F Series10/25/2019
12 en F-28F/280F Series7/16/2020
12 en F-28F/280F Series7/16/2020
13 en F-28F/280F Series1/5/2024
13 en F-28F/280F Series1/5/2024
14 en F-28F/280F Series7/30/2024
14 en F-28F/280F Series7/30/2024
15 en F-28F/280F Series9/26/2024
15 en F-28F/280F Series9/26/2024
9 en F-28F/280F Series12/14/2017
9 en F-28F/280F Series12/14/2017
22 en TH-28/480 Series10/1/2014
25 en TH-28/480 Series8/22/2016
25 en TH-28/480 Series8/22/2016
26 en TH-28/480 Series2/28/2020
26 en TH-28/480 Series2/28/2020
27 en TH-28/480 Series1/27/2025
Minimum Master Equipment Lists
NameRevisionLangSubjectDate
en F-28F, F-28F-R & 280FX2/24/2016
en 480B12/11/2015
Operational Suitability Data
NameRevisionLangSubjectDate
en F-28F, F-28F-R & 280FX - Flight Crew Data2/24/2016
en 480B - Flight Crew Data 11/7/2016
Operator's Manuals: F-28/280 Series
NameRevisionLangSubjectDate
en Garmin SL30 NAV/COM Transceiver2/16/2010
en Sandia Altitude Data System2/16/2010
en Garmin GNS 430W/530W Navigation System1/19/2009
en Garmin GDL 69/69A XM WX Satellite Weather/Radio Receiver1/19/2009
en Bendix/King KX 165A NAV/COM System1/16/2014
1 en Garmin GTN 650 Navigation System with MD200-306 CDI7/27/2015
2 en Garmin GTN 650 Navigation System with MD200-306 CDI3/28/2019
en GTX 330 Transponder with ADS-B Out7/27/2015
en Garmin GNC 255A NAV/COM Transceiver12/6/2017
en Garmin GMA 350Hc3/28/2019
1 en Garmin GMA 350Hc5/21/2019
en GTX 345 ADS-B Transponder3/28/2019
Operator's Manuals: TH-28/480 Series
NameRevisionLangSubjectDate
22 en 4805/14/2024
22 en 4805/14/2024
23 en 480B4/28/2016
24 en 480B5/21/2019
24 en 480B5/21/2019
25 en 480B1/27/2025
1 en Bambi Bucket Interface Kit 4220130-14/30/2013
en Avidyne Traffic Advisory System4/1/2009
en Sandia Altitude Data System2/16/2010
en 2+2 Seating Configuration10/26/2009
1 en KTR 908/KFS 598A VHF, KTR 909/KFS 599A UHF Communication Radio System and KMA 24H Audio System6/6/2012
1 en Ukraine Registered Helicopters12/7/2011
en Powerline Detection System3/11/2011
en Partial Wide Instrument Panel3/7/2011
en NAT AMS44 Dual Channel Audio Controller - NAT 247 Audio Mixing Amplifier1/25/2011
1 en Sandel SN3500 EHSI12/3/2014
en Garmin GMA 350H7/2/2014
2 en Argentine Registered Helicopters12/17/2013
1 en Garmin GNS 430W/530W Navigation System5/30/2017
en Pulse Landing Light Installation P/N 4199005-1117/2/2014
1 en Garmin G1000H Integrated Flight Deck5/19/2016
1 en Garmin GTS 800 Traffic Advisory System3/30/2017
en Garmin GDL 69AH XM WX Satellite Weather/Radio Receiver7/2/2014
en Garmin GNC 255A NAV/COM Transceiver with MD200-306 CDI12/3/2014
1 en Garmin GTN 650 Navigation System3/30/2017
2 en Garmin GTN 650 Navigation System6/19/2019
en Garmin GTX 327 Mode A/C Transponder12/3/2014
en Appareo Systems Vision 10003/23/2018
1 en Garmin GTN 650 GPS/NAV/COM (NAV Disabled)3/30/2017
1 en RA-4500 Radar Altimeter1/5/2018
en Garmin G1000H Integrated Flight Deck, Configuration P/N 4220650-33/22/2018
1 en Garmin G1000H Integrated Flight Deck, Configuration P/N 4220650-310/18/2019
en Garmin GMA 350Hc10/1/2018
1 en Garmin GMA 350Hc5/21/2019
en Helicopters Registered in Canada1/24/2019
en GTX 345 ADS-B Transponder12/19/2018
en MD200 Series CDI12/3/2018
Packing Instructions
NameRevisionLangSubjectDate
en Main Rotor Retention Assemblies12/31/2017
en Main Rotor Spindle12/31/2017
Publication Indexes
NameRevisionLangSubjectDate
en Optional Equipment Supplement 6/1/2020
en Optional Equipment Supplement 8/12/2020
en Piston Service Directive Bulletin 5/17/2024
en Piston Service Directive Bulletin 7/25/2024
en Piston Service Directive Bulletin3/28/2025
en Turbine Service Directive Bulletin 12/12/2023
en Turbine Service Directive Bulletin 5/13/2024
en Piston Service Information Letter 12/2/2024
en Piston Service Information Letter 3/28/2025
en Piston Service Information Letter 6/24/2025
en Turbine Service Information Letter 10/14/2024
en Turbine Service Information Letter 1/16/2025
en Turbine Service Information Letter 6/24/2025
en Technical Publications Status10/30/2024
en Technical Publications Status12/2/2024
en Technical Publications Status3/28/2025
Service Directive Bulletins: F-28/280 Series
NameRevisionLangSubjectDate
en Main Rotor Transmission4/12/1967
en Main Rotor Transmission7/26/1967
en Ignition System7/27/1967
en Tail Rotor Blade Life - P/N 28-151005/10/1968
en Belt Drive Support Strut P/N 28-132278/4/1969
en Lower Jack Strut Bearing O-Ring MS9021-04210/23/1969
en Torque, Main Rotor Transmission Pinion Shaft Nut NO-610/24/1969
A en Main Rotor Control Pitch Link10/22/1971
A en Idler Yoke Assembly - P/N 28-13292 Rev. A5/30/1973
en Cancelled Inspection of Stabilizer Attach Tube, P/N 28-112222/3/2005
en Taper Pins on Tail Rotor Drive Shaft3/29/1972
en Tail Rotor Output Shaft Seal Housing5/18/1972
en Cancelled Inspection of Idler Tension Straps, P/N 28-132362/3/2005
en Main Rotor Hub Nut9/25/1972
en Cyclic Stick Torque Tube Assemblies2/26/1973
C en Oil Level in Tail Rotor Gearbox9/25/1974
C en Revised Transmission Overhaul Life1/3/1983
A en Recommended Flight Procedure for Partial Loss of Power2/15/1974
en Cancelled Rapid Rotor Clutch Engagement5/31/2001
B en Main Rotor Spindles - P/N 28-14282, E.0. No. 84/2/1982
C en Main Rotor Spindle P/N 28-142 824/2/1982
en Backfire Damage to Inlet Air System10/16/1974
en Belt Tightening System10/18/1974
en Main Rotor Blade Inspection12/17/1974
A en Main Rotor Hub Retention7/31/1975
en Cooling Air Turning Vane - P/N 280-126001-97/21/1975
en Over-Running Clutch Assembly - P/N 28-1340112/9/1975
en Fuel Tank Vent Manifold12/9/1975
A en Tail Cone Attachment Bolts1/21/1976
en Bellcrank P/N 28-16338 - Tail Rotor Control System12/9/1975
en Cancelled Main Rotor Shaft3/6/2000
en Rubber Hose in Airspeed Indicator Pitot Line1/19/1976
en Tail Rotor Control Pitch Link Retention1/21/1976
en Copilot's Tail Rotor Pedal Clearance with Defroster Installation Mount Bolt1/22/1976
A en Upper Swashplate Bearing7/9/1990
en Main Rotor Shaft8/2/1976
A en Tail Rotor Spindle1/17/1977
en Cancelled Inspection of Stabilizer Attach Tube2/3/2005
en Inspection of Tail Rotor Drive Shaft After Tail Rotor Strike5/12/1977
en Replacement of Wide Chord Tail Rotor Pitch Link Retainer Assembly, P/N 28-16320; Guide Bolt, P/N 28-163075/20/1977
en Tail Rotor Cable Corrosion in Engine Compartment Area5/26/1977
en Readjusted Wide-Chord Tail Rotor Counterweight7/28/1977
en Special Inspections - Tail Rotor Controls7/11/1977
en Replacement and Installation of Tail Rotor Thrust Bearing Stack8/8/1977
en Inadvertent Engine Stoppage on Power Reductions at High Density Altitudes11/2/1977
en Dual Collective Stick Reinstallation12/2/1977
en Main Rotor Transmission12/13/1978
A en Wide Chord Tail Rotor Blade Grip9/8/1980
en Main Rotor Transmission Mount Bolts4/3/1979
en Special Inspection: Collective Control Bellcrank P/N 28-161897/1/1980
en Main Rotor Transmission Mounting Hardware8/7/1980
en Repair of Five Wire Connector3/17/1981
en Compliance to Avco Lycoming Service Bulletin No. 454 "Replacement of Oil Pump Impellers"4/30/1981
1 en Wastegate Linkage Assembly2/15/2002
A en Clutch Control System Rigging and Heat Protection4/2/1982
en Replacement of Pitch Link Retainer and Service Improvement of Pitch Control System12/2/1981
en Periodic Inspections of Lamiflex Bearings and Shims in Main Rotor Blade Retention Assembly1/11/1982
en Removal of Induction Pressure Relief Valve7/27/1982
en Installation of Covers on Right Side Engine Compartment Door Louvers6/18/1982
en Compliance to Avco Lycoming Service Bulletin No. 461 and Bendix Service Bulletin No. 617A7/28/1982
en Clutch Engagement Overcenter Lock Warning Light Installation11/12/1982
en Belt Tensioning and Idler System Modifications11/2/1982
1 en Belt Tensioning and Idler System Modifications3/28/2025
en Possible Bendix Impulse Coupling Defect as Noted by Emergency AD Issued on or about 9/9/8210/5/1982
en Collective Friction Usage10/19/1982
B en Tail Rotor Driveshaft Spline Couplings, P/N 28-136097/9/1990
en Lateral Trim Actuator Location Change, Kit Number 28-0102710/1/1984
en Narrow Chord Tail Rotor Forged Grips10/1/1984
A en Life Limit - Overrunning Clutch, P/N 28-13401-1 (Mfg. P/N CL40526-1 thru -7)7/9/1990
A en Established TBO on Overrunning Clutch P/N 28-13401-2 or -4 (Mfr. P/N CL-40526-8 and above)7/9/1990
en Clutch Engagement Handle Guard5/8/1986
en Improved Procedure for Idle Mixture Adjustment5/8/1986
en Rotor Head Hub Plates5/15/1986
en Cancelled Rotor Head Hub Plates3/29/2007
en Wastegate Position Fixity5/15/1987
en Control Cable Corrosion in Engine Compartment5/15/1987
en Tail Rotor Cable Blade Strikes6/8/1987
en Cracked Stabilizer Spar, P/N 28-11222-112/15/1987
1 en Cracked Stabilizer Spar, P/N 28-11222-16/3/2016
B en Tail Rotor Spindle, P/N 28-150064-11 and -13 Life Limit Addition11/16/1992
C en Tail Rotor Spindle, P/N 28-150064-11 and -13 Life Limit Addition6/5/2020
en Tail Rotor Gearbox Inspection10/18/1989
en Landing Gear Leg Cracks, P/N 28-17132-1 thru -410/18/1989
en Tail Rotor Drive Flex Coupling Mandatory Upgrade to (7) Plate Coupling, Inspection & Service Life10/18/1989
2 en Lamiflex Bearing Inspection (P/Ns 28-14320-12 and 28-14320-15)2/3/2017
A en Lamiflex Bearing Inspection (P/Ns 28-14320-12 and 28-14320-15)11/16/1992
A en Inadvertent Trim Motor Operation on 24 Volt D.C. Systems3/18/1993
en Wrapped Main Rotor Shafts P/N 28-13183, All Versions7/16/1993
1 en Muffler Modification and Inspection10/6/2000
2 en Muffler Modification and Inspection10/27/2010
en Cancelled Compliance with Textron Lycoming Service Bulletin 524 and Owner's Advisory #OA5247/20/2001
en Cancelled Electrical System Maintenance and Inspection for Proper Operation, 12 Volt7/20/2001
en Mandatory Serialization of Drag Links11/19/1996
en Cracks in Lower Swashplate Universal Housing, P/N 28-16119-15/28/1997
en Tail Rotor Gearbox Input Seal10/16/1998
1 en Tail Rotor Gearbox Input Seal1/7/2014
en 12 Vdc Voltage Control System Modification10/26/1998
1 en 12 Vdc Voltage Control System Modification4/23/2015
2 en 12 Vdc Voltage Control System Modification11/21/2023
3 en 12 Vdc Voltage Control System Modification6/5/2024
1 en Lower Swashplate Assembly Inspection3/6/2000
2 en Lower Swashplate Assembly Inspection2/18/2025
en Fuel Quantity System Calibration3/6/2000
1 en Fuel Quantity System Calibration10/16/2012
2 en Fuel Quantity System Calibration7/7/2014
3 en Fuel Quantity System Calibration8/3/2015
1 en Tail Rotor Control Cable Inspection12/9/2003
2 en Cracked Main Rotor Shaft2/15/2002
en Idler Pulley Actuator Arm Inspection9/5/2002
1 en Idler Pulley Actuator Arm Inspection10/15/2012
en Main Rotor Push-Pull Rod Inspection9/10/2003
1 en Main Rotor Push-Pull Rod Inspection2/15/2019
2 en Main Rotor Push-Pull Rod Inspection4/2/2019
en Incorrect Installation Hardware on Seat Belt Bracket, P/N 28-11467-12/3/2005
en Cancelled Incorrect Marking of ECD002-11 Bearing Set8/25/2010
en Incorrect Marking of ECD002-11 Bearing Set2/3/2006
en Non-Conforming Tie Rod Assemblies, P/N 28-16498-9 & 28-16498-1013/29/2006
en Inspect Swashplate Rod End (Dog Leg) Assembly, P/N 28-16143-1, for Excessive Play/Wear4/28/2006
en Inspect Main Rotor Control Rods, P/N 28-16253-103/105, for Loose Upper Fittings5/23/2006
en Hinge Pins (Main Rotor Blade Retention Pins), P/N 28-14007-3, Manufactured from Incorrect Specification Material3/20/2007
en Inspection of Turbocharger Bypass Tube5/3/2007
en Possible Interference Involving Main Rotor Pitch Change Bellcrank (Cyclic Walking Beam) (Clarification)10/6/2008
en Collective Bellcrank Inspection10/17/2008
en Main Rotor Pitch Change Bellcranks Missing Chamfers11/3/2008
en Wastegate Linkage Assembly11/7/2008
en Cracked Pylons4/16/2009
1 en Cracked Pylons9/14/2009
en Idler Yoke Inspection, P/N 28-13299-19/9/2010
1 en Idler Yoke Inspection, P/N 28-13299-110/27/2010
en Cyclic Trim System - Cyclic Trim Assembly Kit for Lateral and Longitudinal Trim Actuator Assemblies2/7/2011
1 en Cyclic Trim System - Cyclic Trim Assembly Kit for Lateral and Longitudinal Trim Actuator Assemblies4/15/2011
2 en Cyclic Trim System - Cyclic Trim Assembly Kit for Lateral and Longitudinal Trim Actuator Assemblies5/16/2011
3 en Cyclic Trim System - Cyclic Trim Assembly Kit for Lateral and Longitudinal Trim Actuator Assemblies7/6/2011
4 en Cyclic Trim System - Cyclic Trim Assembly Kit for Lateral and Longitudinal Trim Actuator Assemblies1/23/2012
en Tail Rotor Driveshaft and Tach Drive Pulley Guard Inspection4/26/2011
1 en Tail Rotor Driveshaft and Tach Drive Pulley Guard Inspection6/29/2011
2 en Tail Rotor Driveshaft and Tach Drive Pulley Guard Inspection2/26/2025
en Cooling Fan Assembly Inspection9/22/2011
en Cyclic Trim Actuator Switch Assembly Inspection9/27/2011
en Pylon Tube Inspection, P/N 28-11100-711/23/2012
en Trim Relay Replacement1/9/2013
en Cyclic and Collective Control Tube Assembly Inspections3/22/2013
1 en Cyclic and Collective Control Tube Assembly Inspections11/7/2017
2 en Cyclic and Collective Control Tube Assembly Inspections10/13/2020
3 en Cyclic and Collective Control Tube Assembly Inspections4/11/2023
en Main Rotor Drive Belt7/7/2014
1 en Main Rotor Drive Belt5/12/2015
3 en Main Rotor Drive Belt11/7/2017
4 en Main Rotor Drive Belt11/21/2023
en Idler Yoke Inspection, P/N 28-13299-3 (Machined Component)12/16/2014
1 en Idler Yoke Inspection, P/N 28-13299-3 (Machined Component)12/11/2015
en Main Rotor Spindle, P/N 28-14282-11 and P/N 28-14282-132/11/2015
1 en Main Rotor Spindle, P/N 28-14282-11 and P/N 28-14282-134/1/2015
2 en Main Rotor Spindle, P/N 28-14282-11 and P/N 28-14282-136/1/2015
3 en Main Rotor Spindle, P/N 28-14282-11 and P/N 28-14282-136/24/2016
en Collective Stick Socket Inspection4/29/2015
en Mixture Adjustment Rod Assembly3/21/2016
en Exhaust Clamp Installations7/14/2016
1 en Exhaust Clamp Installations8/2/2017
2 en Exhaust Clamp Installations4/26/2018
en Oil Pressure Line, Restrictor12/1/2016
1 en Oil Pressure Line, Restrictor5/19/2017
en Landing Gear Assembly - Clamp Inspection2/3/2017
1 en Tail Rotor Rotating Controls Installation Inspection11/10/2017
en Cabin Bellcrank Mounts and Bellcrank Attachment Inspection4/26/2017
1 en Cabin Bellcrank Mounts and Bellcrank Attachment Inspection7/6/2023
en Rod End Inspection8/2/2017
1 en Rod End Inspection10/6/2017
2 en Rod End Inspection6/20/2018
en Copilot Collective - Retention Pin Installation12/20/2017
en Air Filter Container Door Hinge Pins1/22/2019
en Battery Hold Down Installation4/2/2019
1 en Tail Rotor Control Cable Corrosion1/17/2020
en Clutch Handle Rigging12/9/2021
1 en Clutch Handle Rigging11/21/2023
Service Directive Bulletins: TH-28/480 Series
NameRevisionLangSubjectDate
en Cancelled Possible Ingestion of Inlet Duct Boots2/16/2000
A en Main Rotor Gearbox, P/N 4130020, Cracked Ring Gear Carrier12/4/1996
en Possible Interference Involving Main Rotor Pitch Change Bellcrank (Cyclic Walking Beam), P/N 28-14207-1016/6/1996
en Incorrect Length Horizontal Stabilizer Cap Screw6/11/1996
en Cancelled Replacement of Lower Pulley Bearings, P/N ECD-40188/25/2010
B en Replacement of Lower Pulley Bearings, P/N ECD-401812/22/1997
en Cracked Isolation Mount Weldment2/13/1997
en Cracks in Lower Swashplate Universal Housing, P/N 4140535-115/28/1997
en Cracked Oil Cooler Blower Short Shaft, P/N 41291025/28/1997
3 en Cracked Oil Cooler Blower Short Shaft, P/N 41291025/27/2016
en Fuel Shutoff Valve Modification10/3/1997
en Cancelled Swashplate Inspection2/16/2000
en Cancelled Possible Ingestion of Bellmouth Engine Inlet Seal2/16/2000
en Tail Rotor Gearbox Input Seal10/16/1998
1 en Tail Rotor Gearbox Input Seal1/7/2014
2 en Cracked Oil Cooler Blower Shaft Flex Packs9/5/2002
1 en Lanyard Installation for Tailcone Vibration Absorber10/6/2000
en Replacement of Low Point Drain Valve10/6/2000
en Oil Cooler Impeller Assembly Inspection2/15/2002
en Lower Pulley Drive System Inspection1/15/2003
en Cancelled Lower Pulley Drive System Inspection8/25/2010
en H-Strut Inspection6/16/2003
en Main Rotor Push-Pull Rod Inspection9/10/2003
1 en Main Rotor Push-Pull Rod Inspection2/15/2019
2 en Main Rotor Push-Pull Rod Inspection4/2/2019
en Inspection of Pylon Assembly for Cracks8/18/2005
en Installation of Oleo Condition Placards8/25/2005
en Overrunning Clutch Oil Level12/23/2005
en Incorrect Marking of ECD002-11 Bearing Set2/3/2006
en Cancelled Incorrect Marking of ECD002-11 Bearing Set8/25/2010
en Inspect Swashplate Rod End (Dog Leg) Assembly, P/N 28-16143-1, for Excessive Play/Wear4/28/2006
en Inspect Main Rotor Control Rods, P/N 4140532-5, for Loose Upper Fittings5/23/2006
en Power Output Shaft Bearing Inspection6/1/2006
1 en Power Output Shaft Bearing Inspection2/14/2014
en Overrunning Clutch Cover Equipped with a Sight Plug9/5/2006
1 en Overrunning Clutch Cover Equipped with a Sight Plug1/7/2008
1 en Turbine Engine Assembly - Steady State Operation Avoidance Range Limit3/20/2007
2 en Turbine Engine Assembly - Steady State Operation Avoidance Range Limit5/24/2016
en Hinge Pins (Main Rotor Blade Retention Pins), P/N 28-14007-3, Manufactured from Incorrect Specification Material3/20/2007
en Inspection of Circuit Breaker Bus Bar Installation5/14/2007
en Inspection of Horizontal Stabilizer Aft Spar Bolt Engagement10/18/2007
en Tail Rotor Cable Clearance7/25/2008
en Inspection of Tailcone Skins, Flanges and Longerons7/16/2008
1\ en Inspection of Tailcone Skins, Flanges and Longerons12/23/2009
en Possible Interference Involving Main Rotor Pitch Change Bellcrank (Cyclic Walking Beam)10/13/2008
en Main Rotor Pitch Change Bellcranks Missing Chamfers (Clarification)11/3/2008
en Drive System Flex Packs (Clarification)1/28/2009
1 en Drive System Flex Packs12/12/2023
en Drive Belt Clearance11/20/2009
en Engine Mount Inspection (P/N 4120012-11/-12)2/26/2010
1 en Engine Mount Inspection (P/N 4120012-11/-12)5/5/2011
en Cyclic Trim System - Cyclic Trim Assembly Kit for Lateral and Longitudinal Trim Actuator Assemblies2/7/2011
1 en Cyclic Trim System - Cyclic Trim Assembly Kit for Lateral and Longitudinal Trim Actuator Assemblies3/29/2011
2 en Cyclic Trim System - Cyclic Trim Assembly Kit for Lateral and Longitudinal Trim Actuator Assemblies5/16/2011
3 en Cyclic Trim System - Cyclic Trim Assembly Kit for Lateral and Longitudinal Trim Actuator Assemblies7/6/2011
en Cyclic Trim Actuator Switch Assembly Inspection9/26/2011
en Mounting Hardware Inspection11/28/2011
en Cyclic and Collective Control Tubes and Stop Ring Assembly Inspections12/5/2011
1 en Cyclic and Collective Control Tubes and Stop Ring Assembly Inspections6/28/2012
2 en Cyclic and Collective Control Tubes and Stop Ring Assembly Inspections11/7/2017
en Trim Relay Replacement1/9/2013
en Copilot Collective - Retention Pin Installation1/7/2014
1 en Copilot Collective - Retention Pin Installation6/25/2014
en Main Rotor Drive Belt7/7/2014
1 en Main Rotor Drive Belt5/12/2015
2 en Main Rotor Drive Belt1/11/2017
3 en Main Rotor Drive Belt11/7/2017
en Tail Rotor Drive Shaft Bearing Assembly9/25/2014
en Engine Idle Stop Assembly, P/N 4167370-19/18/2014
en Overrunning Clutch Assembly11/6/2014
en Main Rotor Spindle (Lamiflex), P/N 28-14282-132/11/2015
1 en Main Rotor Spindle (Lamiflex), P/N 28-14282-134/1/2015
2 en Main Rotor Spindle (Lamiflex), P/N 28-14282-136/1/2015
3 en Main Rotor Spindle (Lamiflex), P/N 28-14282-136/24/2016
en Fuel Tank Inspection2/16/2015
en Electrical System - Engine Idle Stop Wiring Inspection11/16/2015
en Particle Separator Assembly, Rivet Inspection11/2/2016
en Lamiflex Bearing Inspection (P/N 28-14320-15)2/3/2017
en Tail Rotor Rotating Controls Installation Inspection4/7/2017
en Shoulder Harness Attachment Inspection5/19/2017
en Fuel Quantity Transmitter - Cover and Gasket7/6/2017
en Rod End Inspection8/2/2017
1 en Rod End Inspection6/20/2018
en Fuel Quantity Indicator Identification8/2/2017
en Fiberglass Procedure for Upper Plenum/Air Inlet Hand Holds and Nutplate Rivets5/24/2018
1 en Fiberglass Procedure for Upper Plenum/Air Inlet Hand Holds and Nutplate Rivets9/5/2018
1 en Lower Air Plenum Assembly Wedge Vane10/29/2019
en Drag Strut Assembly Inspection8/27/2019
1 en Drag Strut Assembly Inspection2/3/2020
2 en Drag Strut Assembly Inspection6/5/2020
en Cargo Hook Extension Link Inspection9/10/2019
en Tailcone Bulkhead Inspection8/25/2020
en Transmission Mount - Pylon Joint Cracks10/13/2020
Service Information Letters
NameRevisionLangSubjectDate
en Tail Rotor Transmission (Gearbox), Premature Gear Wear6/24/2025
en Tail Rotor Transmission (Gearbox), Premature Gear Wear6/24/2025
Service Information Letters: F-28/280 Series
NameRevisionLangSubjectDate
en Engine Crankcase Vent2/29/1968
en Fuel Line2/29/1968
en Cancelled Taper Pins - Tail Rotor Drive Shaft10/6/2000
en Cancelled Bolts - Rotor Damper Attachment9/11/2000
en Exhaust Stack Cracks2/10/1969
en Damper Rod End Jam Nut Lockwasher2/12/1969
en Inspection of Cabin Door Handle Attachment Pins2/12/1969
en Cancelled Component Service Life9/11/2000
en Belt Idler Shaft6/4/1969
en Cancelled Replacement of Washers on 28-13236 Actuator Arm10/6/2000
en Cancelled Belt Tension Field Adjustment9/11/2000
en Roll Pin - Friction Lock Handle - Collective Control9/19/1969
en Inlet Air Ducting9/25/1969
A en Proper Lubrication of Lower Jack Strut Bearing5/11/1973
en Chafing of Pressure and Vent Lines, Main Cabin Area12/19/1969
1 en Removal of Alternator Cooling Fan10/6/2000
en Inspection of Tail Rotor Teetering Hinge Bearings4/14/1970
en Inspection of 28-11222 Stabilizer Attachment Tube5/5/1970
en Inspection of Tail Rotor Gearbox Housing Drawing No. 28-13502F11/13/1970
en Revision to Electrical Distribution System2/18/1971
en Inlet Air Ducting4/13/1971
en R.F. Interference with Engine Instrument Cluster4/30/1971
en Cancelled Compliance of Service Letter #0016 Survey10/6/2000
en Main Rotor Blade Leading Edge Protection9/24/1971
en Rod End Assembly - P/N 28-16143 - Swash Plate Assembly6/26/1972
en Safety Lock Washer on Damper Rod End5/18/1972
A en Inspection of Over-Center Mount Pad 28-11100-834/30/1974
en Cancelled Belt Engagement Over-Centering Capsule Adjustment10/6/2000
en Cancelled Oil Filler Cap Assembly - Main Rotor Gearbox10/6/2000
en Collective Control Assembly (Pilot Stick)10/10/1972
en Collective Friction Lock Assembly5/31/1973
en Field Phasing of Main Rotor Controls by Field Mechanics6/4/1973
en Blade Damper Bleeding Procedure7/25/1973
en Abnormal Airframe Vibration9/20/1973
en Field Installation of Tail Rotor Blades to Splined Tail Rotor Output Shaft12/17/1973
en Oil Sump Quick Drain Hose Assemblies2/4/1974
A en Inspection of Spindle Nylatron Sleeve10/1/1983
en Lubrication of Seal3/14/1974
en Setting Autorotative RPM5/22/1974
en Eligibility for Certification in UK5/30/1974
en Cancelled Pulley Alignment & Idler Tracking10/6/2000
en Recommended Procedure for Operation of Ground Handling Wheels1/17/1975
en Inspection of 28-16192 and 28-16339 Push-Pull Control Rods2/20/1975
en Eligibility for Certification in Republic of West Germany3/9/1979
en Possible Interference of Blade Grip and Spindle8/11/1975
en Damper Modification3/19/1976
en Title Changes for Service Communications3/11/1976
en Foam Tape Separation from Cooling Fan Shroud3/30/1976
en Cancelled "C" Model Factory Conversions6/14/1976
en Limit Range on Rotor Tachometer1/21/1976
en Improved Teetering Bearing1/27/1977
en Improved Narrow-Chord Tail Rotor Spindle Design1/27/1977
en Cancelled Low Rotor RPM Warning Unit10/18/2023
en Induction System Hose Clamps1/27/1977
1 en Induction System Hose Clamps4/7/2017
en Cancelled Main Rotor Damper Fatigue Life10/18/2023
en Tail Rotor Input Shaft Nut Torque1/27/1977
en Main Rotor Gearbox Retention Bolts1/27/1977
en Cancelled Fatigue Retirement Lives10/18/2023
en Inspection and Packing of Sealed Bearings2/15/1977
en Instructions for Obtaining Reworked Tail Rotor Spindle and New Teeter Stop3/10/1977
en Helicopter Weight and Balance Fulcrum4/25/1977
en Fuel Line Insulation (Lagging)6/22/1977
en Improved Turbocharger Oil Inlet Adapter5/27/1977
en Idler Stabilizer Installation Kit6/1/1977
en Eligibility for General Purpose Certification in UK6/2/1977
en Eligibility for General Purpose Certification in UK6/2/1977
en Configuration of Helicopters Delivered to Australia7/27/1977
en Oleo Boot Kit8/23/1977
en Engine Troubleshooting Procedures for Turbo Installations and Idle Adjustments to Correct Engine Roughness and/or Inadvertent Stoppage10/7/1977
en Eligibility for General Purpose Certification in UK2/20/1979
en Cancelled Cancellation Notice11/21/2023
en Eligibility for Certification in Republic of West Germany5/1/1978
A en O-Ring Main Rotor Retention Assembly, Reference Service Information Letter No. 00735/24/1979
en Drive Belt Inspection Requirements12/12/1978
1 en Drive Belt Inspection Requirements7/24/2007
2 en Drive Belt Inspection Requirements4/27/2016
3 en Drive Belt Inspection Requirements11/21/2023
A en Main Rotor Blade Damper11/20/1980
en Cancelled Main Rotor Transmission Mounting Hardware11/21/2023
en Torque, Main Rotor Transmission, Pinion Shaft Nut SLN 304512/12/1978
en Fire Wall Inspection12/13/1978
A en Over-Running Clutch Lubrication2/14/1980
2 en Clutch Control & Belt Tension Inspection & Rigging Procedure3/28/2025
A en Clutch Control & Belt Tension Rigging Procedure8/4/1982
en Inspection of Turbocharger for Oil Leakage between Bearing Housing Flange and Bearing Housing12/12/1978
en Replacement Oil Lines12/13/1978
en Modification to Static Vent System12/14/1978
en Inspection, Pinion Shaft Run-Out12/19/1978
en Recommended Transmission Overhaul Interval12/19/1978
en Tail Rotor Rigging Tool Markings (T-0080)3/5/1979
en Tail Rotor Blade Bearing Inspection & Lubrication3/6/1979
2 en Special Inspection for Main and/or Tail Rotor Blade Strike/Sudden Stoppage11/13/2019
A en Special Inspection for Main and/or Tail Rotor Blade Strike/Sudden Stoppage8/6/1980
en Inspection of Main Rotor Blade Leading Edge Tape1/22/1979
en Fuel Nozzle Air Vent Modification5/23/1979
A en Modification to Engine Starting System9/26/1980
en Monitoring EGT System2/14/1980
en Starter Ring Gear Clearance2/13/1980
en Preflight Control System Check2/25/1980
en Corrosion on Main and Tail Rotor Blades7/17/1980
en Inspection of P/N 28-12462 Fuel Lines
en Cancelled Life Limit on Lamiflex Bearing11/21/2023
en Life Limit on Lamiflex Bearing7/1/1980
en Turbocharger Gasket Replacement8/6/1980
en Corrosion Control on Low Usage Aircraft8/6/1980
en Main Rotor Flapping Bearing Lubrication8/6/1980
en Position and Strobe Light Assembly Light Shields8/18/1980
en Tail Rotor Teeter Bearing P/N KRP8A-C9/26/1980
en Improved Overrunning Clutch11/13/1980
en Installation of Stainless Steel Tape for Rotor Blade Corrosion and Erosion Protection11/13/1980
en Change of Retard Timing on Bendix D-2000/3000 Shower of Sparks Magnetos11/13/1980
en Cockpit Mixture Control Friction Adjustment11/13/1980
en Solar Shield Availability10/6/1980
en Improved Lower Jack Strut3/17/1981
en Slinger Rings for Rain Protection on Main Rotor Shaft and Tail Rotor Input Shaft3/10/1981
B en Swashplate Lubrications3/18/1993
en Improved Engine Starting Characteristics3/11/1981
en Tolerance Fit on Main Rotor Gearbox Pinion Drive Key4/2/1981
1 en Tolerance Fit on Main Rotor Gearbox Pinion Drive Key3/14/2018
en Landing Light Modification4/23/1981
en Recommended Optional Safety Equipment4/28/1981
en Improved Main Rotor Blade Damper3/9/1981
4 en Service Life Limits1/2/2001
5 en Service Life Limits10/14/2008
6 en Service Life Limits9/12/2011
7 en Service Life Limits6/7/2012
8 en Service Life Limits11/13/2019
en Hot Weather Auxiliary Oil Cooler Kit8/26/1981
en Engine Lubricating Oil - Recommendations for all Temperature Operation8/26/1981
en Internal Timing of 2200/3300 Series Dual Bendix Magneto with Shower of Sparks12/2/1981
en Teeter Bearing Lubrication and Inspection12/2/1981
en Troubleshooting & Tracking Enstrom Articulated Rotor System12/2/1981
en Improved Starter Installation4/14/1982
en Improved Oil Cooler Access4/14/1982
en Fuel System Ice Prevention4/14/1982
en Change of Overboost Warning System7/27/1982
en Inspection of Flapping Bearing Preload and Condition7/27/1982
A en Preventive Maintenance of Main and Tail Rotor Blades for Corrosion Control in Field12/15/1987
en Cancelled Minor Design Change Affecting Usage in Sets of Lamiflex Thrust Bearings11/21/2023
en Minor Maintenance & Repair of Main & Tail Rotor Blades11/12/1982
en Eligibility for Normal Category 2600 Pound Gross Weight10/1/1984
en Engine Damage from Improper Operation10/1/1984
en Cancelled Tail Rotor Drive Flex Couplings Inspection and Service Life3/6/2000
en Installation of Matched Angular Contact Bearings in Tail Rotor Retention Systems6/8/1987
en Eligibility for Certification in UK12/16/1988
en Eligibility for Certification in UK12/16/1988
en Applicability of Lubrication Engineering Greases, Almagard 3751 and Almaplex 127510/18/1989
en Authorized Lubrication and Fuels Specifications9/11/1985
en Cancelled Authorized Lubrication and Fuels Specifications9/25/2012
en Pinion Nut Torque and Upper Jack Strut Bearing Adaptor Inspection9/11/1985
en Inspection of Rotor Tachometer Drive Belts9/11/1985
1 en Inspection of Rotor Tachometer Drive Belts10/14/2008
en Inspection and Proper Installation of Seat Belts9/11/1985
en New Improved Tail Rotor Teeter Bearing Assembly9/11/1995
1 en New Improved Tail Rotor Teeter Bearing Assembly12/2/2024
1 en New Tail Rotor Assembly Bumpers2/15/2002
1 en Cancelled New Tail Rotor Assembly Bumpers5/17/2024
en Inadvertent Trim Motor Operation on 24 Volt D.C. Systems5/28/1997
en Main and Tail Rotor Transmission Chip Indications on New or Recently Overhauled Transmissions10/3/1997
en Vibration and/or Main Rotor Tracking Problems on F-28/280C, F-28C-2, and F-28/280F Helicopters Equipped with Floats, and/or Operating at Gross Weights Exceeding 2350 Pounds, or Operating with Large Lateral Moment Arm10/3/1997
en Improved Main Rotor Control Rod Assembly10/3/1997
en Modified Flapping Bearing Installation Procedure12/11/1997
1 en Modified Flapping Bearing Installation Procedure5/29/2015
en Low Rotor Speed Warning Switch3/31/1999
en Lamiflex Bearing, P/N 28-14320-15, Usage5/3/1999
1 en New Lower Swashplate Assembly, P/N 28-16101-9393/6/2000
2 en Lower Swashplate Assembly, P/N 28-16101-1012/18/2025
en Low Rotor Warning Tone Generator "Shelf Life"3/6/2000
en Belt Tension Adjustment and Idler Pulley Alignment5/31/2001
1 en Idler Pulley Alignment & Snubber Roller Adjustment3/28/2025
en Tail Rotor Assembly, P/N 28-150000, Configurations2/15/2002
en Starter Circuit Wiring Modification9/5/2002
1 en Drive Belt Compound Change9/10/2003
en Main Rotor Push-Pull Rod, P/N 28-16253-"X", Serviceability Inspection Criteria12/9/2003
en Installation Torque for Main Rotor Damper Relief Valve, P/N 28-14367-71/31/2005
en Fixed Length Tail Rotor Pitch Change Link, P/N 28-16391-11/31/2005
en F-28A and 280 Left Side Tail Rotor Installation1/31/2005
en Modified Procedure for Attaching Main Rotor Control Rods to Lower Swashplate Assembly10/30/2006
en Main Rotor Damper Oil Part Number5/4/2007
en Tail Rotor Thrust Bearings, P/N ECD002-115/8/2007
1 en Tail Rotor Thrust Bearings, P/N ECD002-1111/21/2023
en Turbocharger Adapter Assembly7/24/2007
1 en Turbocharger Adapter Assembly4/2/2019
en Cyclic Trim System Configurations7/24/2007
en Tail Rotor P/C Link Installation Inspection10/19/2007
2 en Tail Rotor P/C Link Installation Inspection5/12/2015
3 en Tail Rotor P/C Link Installation Inspection4/7/2017
4 en Tail Rotor P/C Link Installation Inspection11/10/2017
en Main Rotor Gearbox Bolt Retorque5/21/2008
en Sliding Window Installation11/25/2008
1 en Sliding Window Installation1/5/2010
en Grease Recommendations for Rotor System Bearings1/20/2009
en Identifying Corrosion Severity Zone for Operating Environment4/28/2009
en Application of Corrosion Prevention Compound3/22/2010
en Proper Servicing of Fuel Filter Screen3/26/2012
en Blade Tape Repair1/20/2011
en Pylon Structure Inspection for Agricultural and External Load Aircraft9/2/2010
en Blade Interchangeability and Identification1/20/2011
en Turbocharger Adapter Assembly4/8/2011
1 en Turbocharger Adapter Assembly12/12/2023
en Alternative Lubrication Method for ECD016 and ECD018 Bearings7/11/2011
en Main Rotor System Tracking8/19/2011
en Upper Swashplate Bearing Housing Configurations4/15/2014
en Copilot Flight Controls Removal12/5/2011
1 en Copilot Flight Controls Removal12/20/2017
en Cancelled Production Certificate Reissue10/14/2024
en Production Certificate Reissue4/15/2014
en Fuel Management - Dipstick Use and Fuel Samples3/17/2015
1 en Fuel Management - Dipstick Use and Fuel Samples11/7/2017
en Collective Stick Socket Replacement8/19/2015
en Collective Trim Adjustment Rod Assembly, P/N 28-162423/21/2016
1 en Collective Trim Adjustment Rod Assembly, P/N 28-1624211/20/2017
2 en Collective Trim Adjustment Rod Assembly, P/N 28-1624212/20/2018
3 en Collective Trim Adjustment Rod Assembly, P/N 28-162425/16/2023
en CHT Probe Installation5/19/2016
en Wastegate Linkage and Throttle Cable Installations3/30/2016
en Universal Block, P/N 28-14117-1111/9/2016
1 en Universal Block, P/N 28-14117-114/2/2024
en Oil Pressure Gauge, Troubleshooting12/1/2016
en Magneto Retard Terminal P-Lead Insulator2/4/2019
en Cabin Door Removal4/2/2019
en Lamiflex Bearing Discontinuation8/14/2019
en Tail Rotor Cable Assembly12/9/2019
1 en Tail Rotor Gearbox, Oil Level Check and Servicing5/9/2023
Service Information Letters: TH-28/480 Series
NameRevisionLangSubjectDate
en Generator Switch Operation9/11/1995
4 en Service Life Limits9/10/2003
5 en Service Life Limits3/22/2010
6 en Service Life Limits5/10/2013
7 en Service Life Limits4/15/2014
8 en Service Life Limits1/4/2016
en Engine Oil Warning Placard6/21/1996
en Cancelled Improved Tail Rotor Feathering Axis Bumper, P/N 28-15033-132/15/2002
en Cancelled Main and Tail Rotor Transmission Chip Indications on New or Recently Overhauled Transmissions2/16/2000
en Improved Fuel Shutoff Valve Operation10/3/1997
en Drain Hole Installation in Cabin Doors12/11/1997
en Alternative Spar Fitting Attachment12/10/1998
en Cancelled Allison Engine 250-C20W2/15/2002
en Cancelled Cyclic Stick Socket Installation Repair2/16/2000
en Main Electrical Relays3/31/1999
en Main Rotor Transmission Pinion Nut Retorque3/31/1999
en Serialization of Vibration Absorber Beams4/6/1999
en Generator Control Unit Relocation3/20/2000
en Tail Rotor Transmission Identification2/15/2002
en Drive Belt Tension2/15/2002
en Electrical System Pylon Grounds9/5/2002
en Fuel Cell Leaks6/16/2003
en Main Rotor Push-Pull Rod, P/N 4140532-"X", Serviceability Inspection Criteria12/9/2003
en Fixed Length Tail Rotor Pitch Change Link, P/N 28-16391-11/31/2005
en Elastomeric Main Rotor Damper Kit1/31/2005
en Oil Lubricated Lower Pulley Bearings1/31/2005
en Modified Procedure for Attaching Main Rotor Control Rods to Lower Swashplate Assembly10/30/2006
en Engine Cooling Kit5/2/2007
en Main Rotor Damper Oil Part Number5/4/2007
en Tail Rotor Thrust Bearings, P/N ECD002-115/8/2007
en Tail Rotor P/C Link Installation Inspection10/18/2007
1 en Tail Rotor P/C Link Installation Inspection11/22/2011
2 en Tail Rotor P/C Link Installation Inspection5/12/2015
3 en Tail Rotor P/C Link Installation Inspection4/7/2017
en Landing Gear Fairing Assembly2/11/2008
1 en Landing Gear Fairing Assembly9/5/2018
en Belt Tension and Pulley Alignment Records Log3/25/2008
en Main Rotor Gearbox Bolt Retorque5/21/2008
en Relay Kit Installation11/6/2008
en 600 Hour Inspection Termination for Upper and Lower Swashplate Assemblies and Control Rod Assembly11/25/2008
en Grease Recommendations for Rotor System Bearings1/20/2009
en Sliding Window Installation11/25/2008
1 en Sliding Window Installation1/5/2010
en Identifying Corrosion Severity Zone for Operating Environment5/4/2009
en Bearing Temperature Warning Unit3/19/2010
en Failure of Engine Drive Shaft Support Bearing (ECD4017), Overrunning Clutch Duplex Support Bearing (ECD4014) and/or P/N 23063426 Double Lip Seals10/23/2009
en Application of Corrosion Prevention Compound3/22/2010
en Hi/Lo Rotor RPM Switch Installation, P/N 41990713/22/2010
en Dual Indicating Volt-Ammeter, P/N ECD4041-73/26/2010
en Blade Tape Repair1/20/2011
1 en Blade Tape Repair2/15/2019
en Blade Interchangeability and Identification1/20/2011
en Torque Indication Check Procedure for Maintenance Ground Run and Maintenance Test Flight2/17/2011
en Clarification of Linear Actuator and Droop Compensator Rigging2/23/2011
en Supplemental Information for Restraining Cargo in Cabin3/29/2011
en Lower Drive Retaining Nut Torque Requirement and Washer Replacement5/18/2011
en Alternative, Acceptable Lubrication Method for ECD016-( ) Tail Rotor Pitch Change Bearing5/24/2011
en Retraction Notice, Maintenance Manual Supplement 4, Revision 26/22/2011
en Special Inspections for Agricultural Aircraft7/7/2011
en Main Rotor System Tracking8/19/2011
en Vented Clutch Oil Reservoir, Kit P/N 42300019/20/2011
1 en Vented Clutch Oil Reservoir, Kit P/N 423000112/22/2011
2 en Vented Clutch Oil Reservoir, Kit P/N 423000111/7/2017
en Scavenge Air and Bleed Line Installation - Clamp Replacement10/10/2011
en Teledyne Gill 7641-20 VRLA (Valve Regulated Lead Acid) Battery9/28/2012
1 en Teledyne Gill 7641-20 VRLA (Valve Regulated Lead Acid) Battery9/22/2015
en Fuel Cell Foam Baffle Maintenance Instructions10/31/2012
1 en Fuel Cell Foam Baffle Maintenance Instructions11/16/2022
en T-0192-1 Calibration Reference Bar2/4/2013
1 en T-0192-1 Calibration Reference Bar4/4/2013
en Upper Swashplate Bearing Housing Configurations4/15/2014
en Breather Tube Assembly1/9/2014
en Inspection and Repair of Minor Cabin Roof Bubbles1/23/2014
en Cancelled Production Certificate Reissue10/14/2024
en Production Certificate Reissue4/15/2014
en AeroLEDs Sunspot 36HX Landing Light Upgrade3/7/2014
1 en AeroLEDs Sunspot 36HX Landing Light Upgrade5/19/2016
2 en AeroLEDs Sunspot 36HX Landing Light Upgrade8/21/2019
en Fuel Quantity Transmitter Upgrade7/31/2015
1 en Fuel Quantity Transmitter Upgrade5/19/2017
2 en Fuel Quantity Transmitter Upgrade8/7/2017
en Fuel System, Dipstick Tube Removal8/20/2015
en Main Rotor Gearbox Pump Upgrade7/8/2015
1 en Main Rotor Gearbox Pump Upgrade9/5/2018
en Main Rotor Transmission 600-Hour Inspection12/10/2015
en Bleed Air Restrictor3/30/2016
en Dual Ground Handling Wheel Installation6/21/2016
1 en Dual Ground Handling Wheel Installation5/19/2017
en Universal Block: P/N 28-14117-11 and P/N 28-14117-1311/9/2016
1 en Universal Block: P/N 28-14117-11 and P/N 28-14117-134/2/2024
2 en Universal Block: P/N 28-14117-11 and P/N 28-14117-135/1/2024
en EASA Registration of G1000H-Equipped 480B Helicopters5/24/2017
en EASA Registration of GMA 350H-Equipped 480B Helicopters5/24/2017
en Main Rotor Gearbox Pump Upgrade9/5/2018
en Lamiflex Bearing Discontinuation8/14/2019
en G1000H System Loader Card Software Version 1852.05 Release12/2/2019
en Pylon Reinforcement Doubler Installation10/13/2020
en Fuel Cell (Bladder) Assembly11/16/2022
1 en Fuel Cell (Bladder) Assembly8/12/2024
en Upper Pulley, P/N 4130538-111/16/2025
Service Notes
NameRevisionLangSubjectDate
en Taper Pins on Tail Rotor Drive Shaft3/29/1972
A en Main Rotor Hub Retention7/31/1975
en Over-Running Clutch Assembly - P/N 28-1340112/9/1975
en Tail Cone Attachment Bolts12/9/1975
Technical Tips: F-28/280 Series
NameRevisionLangSubjectDate
en How to Install a Magnetic Pick-Up in a MRGB
en TRGB Flushing Procedures7/13/2016
en Taper Pin Size Chart11/1/2016
en Tail Rotor Gear Box Seal Replacement Input Shaft and Output Shaft Seals
en Tail Rotor Drive Shaft Alignment
en Seal Replacement - Main Rotor Transmission
en Piston Helicopter MRGB Flushing Procedures7/13/2016
en Adjusting Correlator
en Engine Fan Dynamic Balancing Procedure (Vibrex 2000 and Enstrom Photocell Bracket, T-0153-1)
en Fire Curtain Repair
en Maintaining Teledyne Bendix D-3200 Series Magneto10/8/2018
en Modifying Throttle Cable Sheath Attachment
en Piston Engine Exhaust Leaks5/1/2018
en Troubleshooting Information Form (Piston Helicopters)3/1/2016
en Using Engine CHT/EGT Display for Diagnosing Problems10/1/2008
en Collective Friction Lock Slippage
en Reaming and Installation Procedures for 28-16143-3 Rod Ends (Doglegs)
en Field Adjustment of Fuel Servo - F & C
en Plugged Fuel Injector Nozzles
en Proper Servicing of Fuel Screens
en Ground Bounce (Ground Rock)
en Oleos
en Skid Tube Replacement
en TT Strap Maintenance Information3/1/2016
en Tracking Main Rotor Blades9/26/2013
en Tracking Blades with Enstrom Rotor System
en Stick Shake after Servicing
en Repairing Main Rotor Blade Leading Edge Corrosion11/1/2016
en Purge-Locking Grips
en Making Clock Angle Corrections & Enstrom Rotor System
en Main Rotor Blade Track Chart
en Installing New Pitch Change Bearings
en Identification/Verification and Component Card Correction of 28-14282-11 or -13 Main Rotor Spindles
en Ground Bounce (Ground Rock)
en Clock Angle Corrections and Enstrom Rotor System
en Bleeding Dampers
en Blade Tape Repair - 3M 8681HS
en 28-14117 Universal Block Lower Grease Fitting Installation Procedure2/1/2016
en Instructions to Install Flapping Reservoirs
en Float Installation Instructions - P/N 28-1732610/14/2008
en Window Installation
en Tailcone Alignment Work Aid, Using T-0199-1 (Laser Fixture), T-0200-5 (Target)
en Stinger Tube Bracket/Rivet Repair
en Replacing Glass Door
en Repairing Fiberglass Door Fit
en Paint Removal Process & Repairing for Re-Paint
en Installing New Door Cables in F Doors2/1/2016
en Adjusting Door Latches on Late F28-F Doors
en 280FX Door Glass Installation
en "FM" Tail Rotor Chart
en Troubleshooting Tail Rotor Pitch Change Problems
en Tracking and Dynamic Balancing - Tail Rotor Assembly
en Tail Rotor Spindle Assembly Repair Procedure2/2/2016
en Tail Rotor Gear Box Seal Replacement
en ECD 002 Tail Rotor Grip Bearing Inspection Procedure
en Assembling Tail Rotor Spindle Teeter Bearing
en Tail Rotor Pitch Change Bearings
Technical Tips: TH-28/480 Series
NameRevisionLangSubjectDate
en Lower Pulley Hot Bearing Light Troubleshooting
en TRGB Flushing Procedures7/13/2016
en Taper Pin Size Chart11/1/2016
en Tail Rotor Gear Box Seal Replacement Input Shaft and Output Shaft Seals
en Tail Rotor Drive Shaft Alignment
en Proper Cleaning and Service of Clutch Support and Internal Drive Shaft Support Bearings11/1/2016
en Over Running Clutch
en Lower Pulley Alignment Work Aid and Checklist T-0011/15/2003
en How to Install a Magnetic Pick-Up in a MRGB
en Checklist for Belt Tension and Pulley Alignment
en 480 MRGB Flushing Procedures7/13/2016
1 en Instructions for Use of Tool T-0186
en Clarification of Linear Actuator and Droop Compensator Rigging2/23/2011
en Fire Curtain Repair
en Reaming and Installation Procedures for 28-16143-3 Rod Ends (Doglegs)
en Oleos
en Ground Bounce (Ground Rock)
en Skid Tube Replacement
en Purge-Locking Grips
en 28-14117 Universal Block Lower Grease Fitting Installation Procedure2/1/2016
en Blade Tape Repair - 3M 8681HS
en Bleeding Dampers
en Clock Angle Corrections and Enstrom Rotor System
en Ground Bounce (Ground Rock)
en Identification/Verification and Component Card Correction of 28-14282-11, or -13 Main Rotor Spindles
en Installing New Pitch Change Bearings
en Instructions to Install Flapping Reservoirs
en Main Rotor Blade Track Chart
en Making Clock Angle Corrections & Enstrom Rotor System
en Repairing Main Rotor Blade Leading Edge Corrosion11/1/2016
en Stick Shake after Servicing
en Tracking Blades with Enstrom Rotor System
en Tracking Main Rotor Blades9/26/2013
en Stinger Tube Bracket/Rivet Repair
en Changing Plenum Hand Holds10/20/2009
en Paint Removal Process & Repairing for Re-Paint
en Sealing 480 Avionics Bay to Prevent Water Damage to Avionics2/1/2016
en Speed Control Mounting Bracket
en Tuning Tail Mounted Vibration Absorber
en Windshield Leak Repair Procedure (S/N 5134)
1 en Installation of Rubber "U" Channel P/N: 980-001 on Landing Gear Fairing Closeouts
en Troubleshooting Tail Rotor Pitch Change Problems
en Tracking and Dynamic Balancing - Tail Rotor Assembly
en Tail Rotor Spindle Assembly Repair Procedure2/2/2016
en Tail Rotor Pitch Change Bearings
en Tail Rotor Gear Box Seal Replacement
en "FM" Tail Rotor Chart
en ECD 002 Tail Rotor Grip Bearing Inspection Procedure
en Assembling Tail Rotor Spindle Teeter Bearing
en Float Installation & Packing Instructions4/24/1997