# Airworthiness Directives; Aerospatiale Model ATR42-200, -300, -320, and -500 Series Airplanes; and Model ATR72 Series Airplanes
> **Rule** · Final rule. · Published 2001-07-25 · Effective 2001-08-29 · 66 FR 38535
## Document
- **Document number:** 01-18254
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 66 FR 38535
- **Publication date:** 2001-07-25
- **Effective date:** 2001-08-29
- **FAA docket:** Docket No. 2000-NM-203-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to certain Aerospatiale Model ATR42-200, -300, -320, and - 500 series airplanes; and Model ATR72 series airplanes; that requires replacement of the existing uplock boxes of the main and nose landing gears with modified uplock boxes. The actions specified by this AD are intended to prevent a mechanical failure of the uplock box mechanisms, which could result in failure of the associated landing gear to extend. This action is intended to address the identified unsafe condition.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2001/07/25/01-18254/airworthiness-directives-aerospatiale-model-atr42-200--300--320-and--500-series-airplanes-and-model)
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