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National Agricultural Aviation Association eNewsletter
Voice of the Aerial Application Industry
July 30, 2020
FAA Proposes Airworthiness Directive for All Air Tractor Models

The FAA proposes to adopt a new airworthiness directive (AD) for all Air Tractor Inc. (Air Tractor) Models AT-250, AT-300, AT-301, AT-302, AT-400, AT-400A, AT-401, AT-401A, AT-401B, AT-402, AT-402A, AT-402B, AT-501, AT-502, AT-502A, AT-502B, AT-503, AT-503A, AT-504, AT-602, AT-802, and AT-802A airplanes. This proposed AD was prompted by reports of cracks in the flap torque tube actuator attachment brackets that may cause the flap actuator to detach from the flap torque tube. For more information on the proposed AD, see the Federal Register announcement here.

There are differences between this proposed AD and Air Tractor Service Letter 347: Air Tractor SL #347, Rev A, provides an allowance (plus or minus 15%) for the 300-hour visual inspections, and this proposed AD would not. Air Tractor SL #347, Rev A, specifies performing the dye penetrant inspection within 900 hours time-in-service (TIS), and this proposed AD would require the initial dye penetrant inspection within 300 hours TIS. Air Tractor SL #347, Rev A, specifies replacing a cracked torque tube, while this proposed AD would require replacing a cracked torque tube with a torque tube that has zero hours TIS. Air Tractor SL #347, Rev A, specifies reporting any cracked welds identified during the inspections to Air Tractor, and this proposed AD would not.
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This newsletter is intended for NAAA members only. NAAA requests that should any party desire to publish, distribute or quote any part of this newsletter that they first seek the permission of the Association. The views, thoughts, and opinions expressed herein do not necessarily represent those of the National Agricultural Aviation Association (NAAA), its Board of Directors, staff or membership. Items in this newsletter are not the result of paid advertising and are only meant to highlight newsworthy developments. No endorsement by NAAA is intended or implied.
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