AD 2012-22-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company | Airworthiness Directives; The Boeing Company Airplanes |
Unsafe Condition
Crown frame web cracking at left buttock line (LBL) 15.0, station (STA) 320, which could lead to complete fracture of the crown frame assembly, skin damage, and in-flight decompression.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Measure the web at STA 320. Depending on findings, conduct inspections for cracks and missing fasteners, replace the web and fasteners if necessary, and perform related investigative and corrective actions.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Before further flight
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Affected Aircraft
The Boeing Company Model 747-400, -400D, and -400F series airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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