# Airworthiness Directives; Boeing Model 777 Series Airplanes
> **Rule** · Final rule; request for comments. · Published 1999-07-21 · Effective 1999-08-05 · 64 FR 39005
## Document
- **Document number:** 99-18365
- **Category:** airworthiness
- **Manufacturer:** Boeing Model 777 Series
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 64 FR 39005
- **Publication date:** 1999-07-21
- **Effective date:** 1999-08-05
- **FAA docket:** Docket No. 99-NM-113-AD
## Abstract

This amendment adopts a new airworthiness directive (AD) that is applicable to certain Boeing Model 777 series airplanes. This action requires replacement of a certain engine-driven pump (EDP) supply shutoff valve, which is located in the aft strut fairing, with a new shutoff valve. This amendment is prompted by reports of failure of the shutoff valve due to corrosion in the direct current motor in the shutoff valve. The actions specified in this AD are intended to prevent failure of an EDP supply shutoff valve. Such failure, in the event of an engine fire, could result in an uncontrolled fire in the engine compartment.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1999/07/21/99-18365/airworthiness-directives-boeing-model-777-series-airplanes)
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