# Airworthiness Directives; Air Tractor, Inc., Airplanes
> **Rule** · Final rule. · Published 2021-03-25 · Effective 2021-04-29 · 86 FR 15784
## Document
- **Document number:** 2021-06142
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 86 FR 15784
- **Publication date:** 2021-03-25
- **Effective date:** 2021-04-29
- **FAA docket:** Docket No. FAA-2020-0710
## Abstract

The FAA is adopting 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 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. This AD requires repetitive visual and dye penetrant inspections of the flap actuator attachment bracket welds for cracks and replacement if cracks are identified. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2021/03/25/2021-06142/airworthiness-directives-air-tractor-inc-airplanes)
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