Airworthiness Directive · Amendment 39-10922 · Air Tractor, Inc. AT-300, AT-400, and AT-500 Series Airplanes
Air Tractor, Inc. AT-300, AT-400, and AT-500 Series Airplanes
The following model and serial numbered airplanes, certificated in any category, that do not have a part number (P/N) 70975-1 flap actuator overtravel stop installed in accordance with the REWORK INSTRUCTIONS section of Snow Engineering Co. Service Letter #165, dated May 15, 1998: Models AT-300, AT-301, AT-302, AT-400, AT-400A, AT-401, AT-401A, AT-401B, AT-402, AT-402A, and AT-402B airplanes, serial numbers 300- 0001 through 401B-1063; and Models AT-501, AT-502, AT-502A, AT-502B, and AT-503A airplanes, serial numbers 502-0001 through 502B-0500.
This amendment supersedes Airworthiness Directive (AD) 96-23- 19, which currently requires installing a new flap actuator overtravel stop and a roll pin through the overtravel stop and jack screw on certain Air Tractor, Inc. (Air Tractor) Models AT-300, AT-400, and AT- 500 series airplanes. This AD requires replacing the existing flap actuator overtravel stop with a new one of improved design. This AD is the result of reports of the jack screw breaking through the roll pin hole on three of the affected airplanes that were already in compliance with AD 96-23-19. The actions specified by this AD are intended to prevent interference between the flap pushrod and the aileron pushrod caused by the flap actuator overtravel nut disengaging, which could result in loss of aileron control.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
