# Proposed AD FAA-2008-0636: ATR Model ATR42-200, -300, and -320 Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2008-17-19
- Products: ATR-GIE
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: June 10, 2008, 73 FR 32659
- Comments due: July 10, 2008
- Became: [AD 2008-17-19](https://openairdocs.org/ad/2008-17-19)
- Docket: FAA-2008-0636 (https://www.regulations.gov/docket/FAA-2008-0636, where comments are filed)
- Project: 2007-NM-324-AD
- FR document: E8-12934
- Official PDF: https://openairdocs.org/files/sha256/ca/0a/ca0a560a0749f18aefdfb086ae28b46321a76f824ee3c86882be63f06af12642 (from https://www.govinfo.gov/content/pkg/FR-2008-06-10/pdf/E8-12934.pdf)
- Federal Register: https://www.federalregister.gov/documents/2008/06/10/E8-12934/airworthiness-directives-atr-model-atr42-200--300-and--320-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/1F30D5CE4B1EF0A68625746600495914.0001
- Page: https://openairdocs.org/proposed/FAA-2008-0636

## Summary

We propose to adopt a new airworthiness directive (AD) for the products listed above. This proposed AD results from mandatory continuing airworthiness information (MCAI) originated by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as:

One ATR 42-300 experienced a collapse of the Right (RH) Main Landing Gear (MLG) when taxiing, caused by failure of the side brace assembly. Investigations revealed a crack propagation that occurred from a corrosion pit, in a very high stressed area of the upper arm. * * ** * * * *

The unsafe condition is cracking of the upper arms of the secondary side brace assemblies of the MLG, which could result in collapse of the MLG during takeoff or landing, damage to the airplane, and possible injury to the flightcrew and passengers. The proposed AD would require actions that are intended to address the unsafe condition described in the MCAI.

## Notices in this docket

- Jun 10, 2008: Notice of proposed rulemaking (NPRM). (first notice), FR document E8-12934, comments due Jul 10, 2008 (https://www.federalregister.gov/documents/2008/06/10/E8-12934/airworthiness-directives-atr-model-atr42-200--300-and--320-airplanes)

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