# Airworthiness Directives; Boeing Model 737, 747, 757, and 767 Series Airplanes
> **Rule** · Final rule. · Published 2000-12-29 · Effective 2001-02-02 · 65 FR 82898
## Document
- **Document number:** 00-33018
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 65 FR 82898
- **Publication date:** 2000-12-29
- **Effective date:** 2001-02-02
- **FAA docket:** Docket No. 2000-NM-226-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to certain Boeing Model 737, 747, 757, and 767 series airplanes, that requires rework of certain duct assemblies of the environmental control system (ECS) or replacement of the duct assemblies with new or reworked duct assemblies. This action is necessary to prevent potential ignition of fiberglass insulation material installed on the outside of the ECS ducts, which could propagate a small fire and lead to a larger fire. This action is intended to address the identified unsafe condition.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2000/12/29/00-33018/airworthiness-directives-boeing-model-737-747-757-and-767-series-airplanes)
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