AD 2011-05-11
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company Model 747-100 | Airworthiness Directives; The Boeing Company Model 747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747SR, and 747SP Series Airplanes |
Unsafe Condition
Undertorqued or loose fasteners, a cracked bulkhead chord, and a fractured back-up angle could lead to failure of the hanger fitting and bulkhead and consequent separation of the engine from the airplane.
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Required Actions
Inspect airplanes with hi-lok bolts and collars at Group B fastener locations (except fastener 13), and perform investigative and corrective actions if necessary. Perform repetitive inspections of the internal angle and take corrective actions if necessary. Replace fasteners on certain airplanes to terminate certain repetitive inspections.
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Compliance Time
Before further flight
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Affected Aircraft
The Boeing Company Model 747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747SR, and 747SP Series Airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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