# Proposed AD 2000-CE-59-AD: Air Tractor, Inc. Models AT-300, AT-400, AT-400A, AT-401, AT-401B, AT-402, AT-402A, AT-402B, AT-501, AT-502, and AT-502B Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2003-07-04
- Products: Air Tractor
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: December 27, 2002, 67 FR 79008
- Comments due: February 28, 2003
- Became: [AD 2003-07-04](https://openairdocs.org/ad/2003-07-04)
- Docket: 2000-CE-59-AD
- FR document: 02-32685
- Official PDF: https://openairdocs.org/files/sha256/ed/fa/edfade9b7255dad8ca0828b1f779da94b6fc6ad09ac9196898078d5cff647233 (from https://www.govinfo.gov/content/pkg/FR-2002-12-27/pdf/02-32685.pdf)
- Federal Register: https://www.federalregister.gov/documents/2002/12/27/02-32685/airworthiness-directives-air-tractor-inc-models-at-300-at-400-at-400a-at-401-at-401b-at-402-at-402a
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/B451B59290ED943086256C9C006C9C05.0001
- Page: https://openairdocs.org/proposed/2000-CE-59-AD

## Summary

This document proposes to adopt a new airworthiness directive (AD) that would apply to certain Air Tractor, Inc. (Air Tractor) Models AT-300, AT-400, AT-400A, AT-401, AT-401B, AT-402, AT-402A, AT-402B, AT-501, AT-502, and AT-502B airplanes. This proposed AD would require you to repetitively inspect the vertical fin front spar fitting for cracks and replace any cracked fitting found. This proposed AD would also require you to install a steel doubler as a terminating action for the repetitive inspections. This proposed AD is the result of a report of failure of a 1/4-inch thick vertical fin front spar fitting. The actions specified by this proposed AD are intended to prevent failure of the vertical fin front spar fitting, which could result in failure of the rear spar fitting. Such failures could lead to loss of directional control of the airplane.

## Notices in this docket

- Dec 27, 2002: Notice of proposed rulemaking (NPRM). (first notice), FR document 02-32685, comments due Feb 28, 2003 (https://www.federalregister.gov/documents/2002/12/27/02-32685/airworthiness-directives-air-tractor-inc-models-at-300-at-400-at-400a-at-401-at-401b-at-402-at-402a)

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