AD Amdt-39-11183
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | 747-400 | Airworthiness Directives; Boeing Model 747-400 Series Airplanes Powered by Pratt & Whitney PW4000 Engines |
| engine | Pratt & Whitney | PW4000 | Airworthiness Directives; Boeing Model 747-400 Series Airplanes Powered by Pratt & Whitney PW4000 Engines |
Unsafe Condition
Fatigue cracking of end cap bolts, caused by improper installation, and subsequent investigation revealed that properly installed end caps are also subject to early fatigue cracking. This could lead to failure of the end cap assembly, potentially causing engine separation in the event of a primary thrust linkage failure.
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Required Actions
Conduct repetitive inspections to ensure proper installation of the engine thrust link components. Take follow-on corrective action if necessary. Replace the forward engine mount end cap assembly with an improved end cap assembly, which will terminate the repetitive inspections.
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Compliance Time
Not specified in the provided text.
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Affected Aircraft
Boeing Model 747-400 series airplanes powered by Pratt & Whitney PW4000 engines.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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