AD Amdt-39-9571
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | 747-400 | Airworthiness Directives; Boeing Model 747-400 Series Airplanes Powered by General Electric CF6-80C2 or Pratt & Whitney PW4000 Series Engines |
| engine | Pratt & Whitney | PW4000 Series | Airworthiness Directives; Boeing Model 747-400 Series Airplanes Powered by General Electric CF6-80C2 or Pratt & Whitney PW4000 Series Engines |
Unsafe Condition
Fracturing of the coupling nut on the fuel tube on the outboard strut (engine position 1) could result in release of fuel onto the engine cowling and a subsequent fire.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Modify the engine fuel feed system to prevent coupling nut fracturing. Specific actions include inspecting and replacing the coupling nut as necessary.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Before further flight
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Boeing Model 747-400 series airplanes powered by General Electric CF6-80C2 or Pratt & Whitney PW4000 series engines.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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