# Airworthiness Directives; Boeing Model 747 Series Airplanes
> **Rule** · Final rule. · Published 2004-01-07 · Effective 2004-02-11 · 69 FR 859
## Document
- **Document number:** 04-32
- **Category:** airworthiness
- **Manufacturer:** Boeing Model 747 Series
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 69 FR 859
- **Publication date:** 2004-01-07
- **Effective date:** 2004-02-11
- **FAA docket:** Docket No. 2003-NM-05-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to certain Boeing Model 747 series airplanes, that requires identification of the valves installed on the engine struts as hydraulic supply (fire) shutoff valves for the engine-driven pump, corrective action if necessary, and eventual replacement of discrepant valves with serviceable parts. This action is necessary to prevent leakage of hydraulic (flammable) fluid into an engine fire, which could result in an uncontrolled fire. This action is intended to address the identified unsafe condition.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2004/01/07/04-32/airworthiness-directives-boeing-model-747-series-airplanes)
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