# Airworthiness Directives; Boeing Model 767 Series Airplanes Powered by Pratt & Whitney JT9D-7R4 Series Turbofan Engines or General Electric CF6-80A Series Turbofan Engines
> **Rule** · Final rule. · Published 1999-10-18 · Effective 1999-11-22 · 64 FR 56151
## Document
- **Document number:** 99-26568
- **Category:** airworthiness
- **Manufacturer:** Boeing Model 767 Series
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 64 FR 56151
- **Publication date:** 1999-10-18
- **Effective date:** 1999-11-22
- **FAA docket:** Docket No. 98-NM-363-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to certain Boeing Model 767 series airplanes, that requires repetitive inspections to detect certain discrepancies of the cables, fittings, and pulleys of the engine thrust control cables; and repair, if necessary. For certain airplanes, this amendment also requires replacement of certain pulleys with new pulleys, and re-rigging of the engine thrust control cable. This amendment is prompted by reports of engine thrust control cable failures. The actions specified by this AD are intended to prevent such failures, which could result in a severe asymmetric thrust condition during landing, and consequent reduced controllability of the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1999/10/18/99-26568/airworthiness-directives-boeing-model-767-series-airplanes-powered-by-pratt-and-whitney-jt9d-7r4)
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