# Airworthiness Directives; Boeing Model 757 Series Airplanes
> **Rule** · Final rule. · Published 1999-11-16 · Effective 1999-12-21 · 64 FR 62109
## Document
- **Document number:** 99-29471
- **Category:** airworthiness
- **Manufacturer:** Boeing Model 757 Series
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 64 FR 62109
- **Publication date:** 1999-11-16
- **Effective date:** 1999-12-21
- **FAA docket:** Docket No. 99-NM-101-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to certain Boeing Model 757 series airplanes, that requires a modification of the reverse thrust lever assemblies and replacement of the spring bumper assemblies of the thrust reverser sleeves with new assemblies. This amendment is prompted by an FAA review of the thrust reverser system on all transport category airplanes including the Boeing Model 757 series airplane. The actions specified by this AD are intended to prevent operation with an energized sync lock or malfunctioning sleeve locking devices, which could result in the deployment of a thrust reverser in flight and subsequent reduced controllability of the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1999/11/16/99-29471/airworthiness-directives-boeing-model-757-series-airplanes)
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