The Aviation DataBase: Service Information: Twin Commander
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DataBases updated: Jul 16th, 2025
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Custom Kits
NameRevisionLangSubjectDate
A en Nonsiphoning Fuel Filler Cap9/29/1972
en Winterization Kit6/15/1977
A en Lower Spar Cap Replacement Procedure11/12/1992
en Lower Main Spar Replacement Procedure8/21/1992
Service Bulletins
NameRevisionLangSubjectDate
en Failure of Upper Bearing Retaining Pins, Electric Main Landing Gears6/18/1957
en Mandatory Modification - Upper Flame Shielding, Fuel Vent & Vapor Return Lines9/20/1957
en Spar Reinforcement - Vertical and Horizontal Stabilizer12/17/1958
en Improved Fuel Line Routing from Fuel Shutoff Valve to Fuel Booster Pump2/18/1959
en Horizontal Stabilizer Modification3/11/1959
en Rear Spar Reinforcement - Center Wing3/3/1960
A en Reinforcement of 500 Engine Mounts1/20/1961
A en Replacement of Engine Induction Alternate Air Butterfly Valves and Mounting Shafts2/5/1962
en Replacement of Fuel System Aluminum Drain Tubing and Fittings3/16/1962
en Installation of Fuel Drain Lines for Engine Gage Units3/16/1962
en Modification - Wing Trailing Edge Between Wing Stations 24.00 and 59.003/16/1962
en Main Landing Gear Piston Upper Bearing Lock Pin Replacement9/13/1963
A en Main Landing Gear Piston Upper Bearing Lock Pin Replacement6/25/1965
en Inspection of Front Spar Lower Cap at Left and Right Wing Station 24.003/30/1992
1 en Inspection of Front Spar Lower Cap at Left and Right Wing Station 24.006/5/1992
en Inspection of Lower Cap of Forward Spar Between W/S 67 and 86 on Each Wing9/29/1967
A en Modification of Landing Gear Emergency Extension System9/1/1983
A en Replacement of Unfeathering Pump Supply Line6/6/1973
en Bob Weight Installation11/1/1973
1 en Bob Weight Installation4/24/1975
en Bob Weight Installation3/22/1974
2 en Bob Weight Installation5/9/1975
4 en Bob Weight Installation1/26/1981
3 en Bob Weight Installation1/26/1981
en Replacement of Openable Pilot and Copilot Side Windows9/10/1974
en Bleed Air System11/27/1974
en Check of Battery Select Switch Wiring2/20/1975
en Bob Weight Clip Installation5/9/1975
en Failure of Flap Control Bracket6/27/1975
A en Flap Control Bracket Modification3/29/1979
en Reduction in Electric Elevator Trim Speed10/21/1976
en Inspect and/or Replace Wing Spar Cap Rivets1/21/1977
1 en Inspect and/or Replace Wing Spar Cap Rivets2/1/1977
en Fuel Cell Inspection and/or Replacement3/15/1978
en Bob Weight Assembly Modification1/26/1981
en Induction Air Elbow Duct Replacement and Exhaust System Inspection8/20/1982
en Engine Isolator Assembly Inspection and/or Replacement5/11/1984
A en Inspection for Wing Main Spar Lower Cap Corrosion11/9/1992
en Replacement of Flap Master Pulley and Cable with Inspection of Remaining Flap System2/1/1991
en Lower Main Spar Inspection and 39 Rib Modification5/6/1992
1 en Lower Main Spar Inspection and 39 Rib Modification7/7/1992
en Main Spar Lower Cap Forward Flange Crack Inspection at Wing Station 96.0011/3/1992
en Mandatory Wing Fatigue Inspection and Modification7/29/1994
1 en Mandatory Wing and Fuselage Fatigue Inspection and Modification4/19/2000
2 en Mandatory Wing and Fuselage Fatigue Inspection and Modification5/21/2001
en Coupon Removal - Wing Main Spar Lower Cap3/3/1992
en Fueling Placard and Flight Manual Addendum6/9/1992
en Mandatory Empennage - Vertical Stabilizer Inspection and Modification5/19/1994
2 en Mandatory Empennage - Vertical Stabilizer Inspection and Modification9/23/1994
en Mandatory Mandatory Reduction in Speed During Turbulence2/1/1995
en Mandatory Wing Leading Edge Attachment Inspection and Modification10/24/1996
1 en Mandatory Wing Leading Edge Attachment Inspection and Modification5/8/1997
2 en Mandatory Wing Leading Edge Attachment Inspection and Modification8/18/1997
A en Mandatory Replacement of Nose Landing Gear Bolt4/24/1996
C en Mandatory Replacement of Nose Landing Gear Bolt7/25/1996
en Mandatory Flap System Inspection4/14/1997
1 en Mandatory Flap System Inspection7/15/1997
en Mandatory Inspection and Modification of Lower Main Gear Scissors8/1/1997
A en Aileron Spar Inboard Hinge Inspection & Reinforcement12/21/2004
en Alert Upper Wing Skin and Strap - Inspection for Corrosion5/13/2005
en Aileron Spar Center Hinge Inspection & Reinforcement12/21/2004
en Alert Fuselage Attachment to Wing Main Spar - Inspection & Reinforcement9/26/2012
Service Information
NameRevisionLangSubjectDate
en Bendix Service Bulletin No. 5807/25/1975
en Bendix Service Bulletin No. 5835/11/1976
en Rockwell-Collins Service Bulletin No. 811/17/1978
A en Airworthiness Directive - Lithium Sulfur Dioxide Batteries3/25/1980
en Bendix Service Bulletin No. RS-6810/5/1979
en Volcanic Ash Hazards6/4/1980
B en Airworthiness Directive 81-18-04, Amendment 39-43956/29/1982
en Airworthiness Directive 82-13-01, Amendment 39-4405 (Bendix Engine Products Division S-1200 Series Magnetos7/16/1982
en Airworthiness Directive 82-20-01 (Bendix Engine Products Division Magnetos)9/23/1982
A en Lycoming Service Bulletin No. 456C (Replacement of Oil Pump Impellers)3/31/1987
A en Fuel Filler Port Restrictor Installation6/7/1988
en Garrett Turbine Engine Company Service Bulletin No. TPE/TSE331-74-00036/30/1986
en Airworthiness Directive 86-01-06, Amendment 39-5206 (Parker Hannifin Corp. Dry Air Pumps)6/30/1986
en Airworthiness Directive 72-06-05 R1, Amendment 39-5338 (Marvel Schebler Carburetors)7/15/1986
1 en Airworthiness Directive 72-06-05 R1, Amendment 39-5338 (Marvel Schebler Carburetors)8/19/1986
en Avco Lycoming Service Bulletin No. 477A4/16/1987
en Servicing Engine Oil System8/7/1987
A en Inspection and Replacement of Fluid Lines8/2/1995
en Deicer Boot Installation1/16/1996
Service Letters
NameRevisionLangSubjectDate
en Interpretation and Calibration of Dual Scale Fuel Quantity Gage5/12/1961