AD 97-14-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Air Tractor, Inc. | AT-301 | Airworthiness Directives; Air Tractor Incorporated Models AT-301, AT-302, AT-400, AT-400A, AT-401, AT-402, AT-501, and AT-502 Airplanes |
| aircraft | Air Tractor, Inc. | AT-302 | Airworthiness Directives; Air Tractor Incorporated Models AT-301, AT-302, AT-400, AT-400A, AT-401, AT-402, AT-501, and AT-502 Airplanes |
| aircraft | Air Tractor, Inc. | AT-400 | Airworthiness Directives; Air Tractor Incorporated Models AT-301, AT-302, AT-400, AT-400A, AT-401, AT-402, AT-501, and AT-502 Airplanes |
| aircraft | Air Tractor, Inc. | AT-400A | Airworthiness Directives; Air Tractor Incorporated Models AT-301, AT-302, AT-400, AT-400A, AT-401, AT-402, AT-501, and AT-502 Airplanes |
| aircraft | Air Tractor, Inc. | AT-401 | Airworthiness Directives; Air Tractor Incorporated Models AT-301, AT-302, AT-400, AT-400A, AT-401, AT-402, AT-501, and AT-502 Airplanes |
| aircraft | Air Tractor, Inc. | AT-402 | Airworthiness Directives; Air Tractor Incorporated Models AT-301, AT-302, AT-400, AT-400A, AT-401, AT-402, AT-501, and AT-502 Airplanes |
| aircraft | Air Tractor, Inc. | AT-501 | Airworthiness Directives; Air Tractor Incorporated Models AT-301, AT-302, AT-400, AT-400A, AT-401, AT-402, AT-501, and AT-502 Airplanes |
| aircraft | Air Tractor, Inc. | AT-502 | Airworthiness Directives; Air Tractor Incorporated Models AT-301, AT-302, AT-400, AT-400A, AT-401, AT-402, AT-501, and AT-502 Airplanes |
Unsafe Condition
In-flight vertical fin cracking could result in structural failure of the front spar attachments and eventually the rear spar attachment, causing loss of directional control of the airplane.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the fin front spar attachment fittings for fatigue cracks in accordance with Snow Engineering Report No. 138. If no cracks are found, repeat the inspection every 25 hours time-in-service. If cracks are found, modify the fittings prior to further flight.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Required initially within the next 25 hours time-in-service after the effective date of this AD, unless already accomplished, and thereafter as indicated in the body of this AD.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Air Tractor Models AT-301 (301-0261 through 301-0736), AT-401 (401-0662 through 401-0736), AT-302, AT-400, AT-400A, AT-402 (402-0694 and 402-0695 through 402-0736), AT-501 (501-0002 through 501-0030), and AT-502 (502-0002 through 502-0030) equipped with a 3/16-inch fin front spar fitting and all-metal rudder (P/N 30456-1), not modified per Snow Engineering Report No. 138.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.