Air Tractor AT-400 Airworthiness Directives

Every AD in the library whose text names the Air Tractor AT-400, of which 30 are registered in the US.

14 not superseded, 6 of them with a repeat action. 19 listed in all, newest published March 25, 2021.

Published sinceHide 5 supersededOnly repeat actions14 of 19

2021-05-14Requires repetitive visual and dye penetrant inspections of the flap actuator attachment bracket welds for cracks and replacement if cracks are identifiedTe flap control system · AirplaneRepeat actionMar 25, 2021
2009-11-05Continue repetitively inspecting the engine mounts for cracks for all previously affected Air Tractor, IncAir Tractor, Inc. Models AT-400, AT-400A, AT-402, AT-402A, AT-402B, AT-502, AT-502A, AT-502B, AT-503A, AT-602, AT-802, and AT-802A Airplanes · AirplaneSupersedes 2008-10-12Repeat actionMay 22, 2009
2008-09-10Requires a report of any cracks found during any inspection to the FAAAir Tractor, Inc. Models AT-300, AT-301, AT-302, AT-400, and AT-400A Airplanes · AirplaneSupersedes 2003-06-01Repeat actionApr 28, 2008
2005-13-12Repetitively tighten the four eyebolts that attach the front and rear spar of the horizontal stabilizer to the respective stabilizer strut to the specified torque, and repetitively replace at specified intervals any...Air Tractor, Inc. Models AT-300, AT-301, AT-302, AT-400, AT-400A, AT-401, AT-402, AT-602, AT-802, and AT-802A Airplanes · AirplaneRepeat actionJun 22, 2005
2003-07-04Repetitively inspect the vertical fin front spar fitting for cracks and replace any cracked fitting foundAir Tractor, Inc. Models AT-300, AT-400, AT-400A, AT-401, AT-401B, AT-402, AT-402A, AT-402B, AT-501, AT-502, and AT-502B Airplanes · AirplaneSupersedes 95-20-06Repeat actionApr 3, 2003
2000-11-05Requires that you repetitively inspect the vertical fin front spar attachment fittings for fatigue cracks, and rework the vertical fin if any cracks are foundAir Tractor Incorporated Models AT-301, AT-401, and AT-501 Airplanes · AirplaneRepeat actionJun 2, 2000
2006-08-08 R1Air Tractor, Inc. Models AT-400, AT-401, AT-401B, AT-402, AT-402A, and AT-402B AirplanesAirplaneSupersedes 2006-08-08Mar 31, 2009
2008-26-01Air Tractor, Inc. Models AT-200, AT-300, AT-400, AT-500, AT-600, and AT-800 Series AirplanesAirplaneSupersedes 2008-11-17Dec 24, 2008
2002-13-02Inspect (one-time) the wing centerline splice joint for cracks and, if any crack is found, replace the affected wing spar lower capAir Tractor, Inc. Models AT-300, AT-301, AT-302, AT-400, and AT-400A Airplanes · AirplaneJul 1, 2002
2002-11-05Eddy-current inspect the wing lower spar cap immediately prior to the replacement/modification in order to detect and correct any crack in a bolthole before it extends to the modified center section of the wingAir Tractor, Inc. Models AT-400, AT-401, AT-401B, AT-402, AT-402A, AT-402B, AT-501, AT-802, and AT-802A Airplanes · AirplaneSupersedes 2001-10-04 R1May 31, 2002
2001-10-04Requires inspection of the wing lower spar cap for cracks on Air Tractor, IncAir Tractor, Inc. AT-400, AT-500, and AT-800 Series Airplanes · AirplaneSupersedes 2000-14-51May 16, 2001
98-25-01Requires replacing the existing flap actuator overtravel stop with a new one of improved designAir Tractor, Inc. AT-300, AT-400, and AT-500 Series Airplanes · AirplaneSupersedes 96-23-19Dec 3, 1998
97-14-05Air Tractor Incorporated Models AT-301, AT-302, AT-400, AT-400A, AT-401, AT-402, AT-501, and AT-502 AirplanesAirplaneSupersedes 95-20-06Jul 18, 1997
96-24-08Air Tractor, Inc. Models AT-250, AT- 300, AT-301, AT-302, AT-400, AT-400A, AT-401, AT-402, AT-501, and AT- 502 AirplanesAirplaneNov 26, 1996

Listed by the model designations in each AD's text. An AD written for a part number, or for "all" engines of a maker, may name no model and so not appear here: search the library for the part or the maker as well.