AD 99-11-12
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 747-400 Series | Airworthiness Directives; Boeing Model 747-400 Series Airplanes |
| aircraft | The Boeing Company | 747-400D Series | Airworthiness Directives; Boeing Model 747-400 Series Airplanes |
| aircraft | The Boeing Company | 747-400F Series | Airworthiness Directives; Boeing Model 747-400 Series Airplanes |
Unsafe Condition
Fatigue cracking of end cap bolts caused by improper installation and early fatigue cracking of properly installed end caps, which could lead to separation of the engine from the airplane in the event of a primary thrust linkage failure.
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Required Actions
Conduct repetitive inspections to ensure proper installation of engine thrust link components and perform follow-on corrective actions if necessary. Replace the forward engine mount end cap assembly with an improved end cap assembly, which terminates the repetitive inspections upon completion.
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Compliance Time
Before further flight
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Affected Aircraft
Boeing Model 747-400 series airplanes, including 747-400D and 747-400F models, equipped with engine thrust link components requiring inspection and replacement.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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