# Airworthiness Directives; Boeing Model 747-400 Series Airplanes Equipped with Rolls-Royce RB211-524G/H and RB211-524G-T/H-T Engines
> **Rule** · Final rule; request for comments. · Published 2000-02-03 · Effective 2000-02-18 · 65 FR 5222
## Document
- **Document number:** 00-2089
- **Category:** airworthiness
- **Manufacturer:** Boeing Model 747-400 Series
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 65 FR 5222
- **Publication date:** 2000-02-03
- **Effective date:** 2000-02-18
- **FAA docket:** Docket No. 99-NM-76-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to certain Boeing Model 747-400 series airplanes. This action requires installation of a modification of the thrust reverser control and indication system and wiring on each engine; and repetitive operational checks of that installation to detect discrepancies, and repair, if necessary. This amendment is prompted by the results of a safety review, which revealed that in-flight deployment of a thrust reverser could result in a significant reduction in airplane controllability. The actions specified in this AD are intended to ensure the integrity of the fail-safe features of the thrust reverser system by preventing possible failure modes, which could result in inadvertent deployment of a thrust reverser during flight, and consequent reduced controllability of the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2000/02/03/00-2089/airworthiness-directives-boeing-model-747-400-series-airplanes-equipped-with-rolls-royce-rb211-524gh)
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