AD Amdt-39-12247
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Air | Tractor, Inc. AT-400, AT-500, and AT-800 Series | Airworthiness Directives; Air Tractor, Inc. AT-400, AT-500, and AT-800 Series Airplanes |
Unsafe Condition
Fatigue cracks in the wing lower spar cap, originating in the outboard 3/8-inch bolthole, could result in the wing separating from the airplane during flight.
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Required Actions
Inspect the wing lower spar cap using eddy current methods for airplanes at or over the lower safe life. Replace or modify the wing lower spar cap if cracks are found. Terminate inspections when parts become available or after performing three repetitive inspections.
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Compliance Time
Before further flight for airplanes at or over the lower safe life.
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Affected Aircraft
Air Tractor, Inc. AT-400, AT-500, and AT-800 series airplanes, excluding those AT-800 series airplanes equipped with the factory-supplied part number 80540 computerized fire gate.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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