# Airworthiness Directives; Boeing Model 747-400 and 767 Series Airplanes Equipped With General Electric CF6-80C2 Series Engines
> **Rule** · Final rule. · Published 2001-08-20 · Effective 2001-09-24 · 66 FR 43465
## Document
- **Document number:** 01-20698
- **Category:** airworthiness
- **Manufacturer:** Boeing Model 747-400 and 767 Series
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 66 FR 43465
- **Publication date:** 2001-08-20
- **Effective date:** 2001-09-24
- **FAA docket:** Docket No. 2000-NM-275-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to certain Boeing Model 747-400 and 767 series airplanes, that requires modification of the core cowl assemblies of the engines. This action is necessary to prevent failure of the core cowl latches during an engine fire, and consequent in-flight separation of an engine core cowl and its strut fire barrier from the airplane. This action is intended to address the identified unsafe condition.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2001/08/20/01-20698/airworthiness-directives-boeing-model-747-400-and-767-series-airplanes-equipped-with-general)
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