AD 2012-04-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company | Airworthiness Directives; The Boeing Company Airplanes |
Unsafe Condition
Scribe lines found at lap joints and butt joints, around external doublers and antennas, and at locations where external decals had been cut can develop into fatigue cracks in the skin and cause sudden decompression of the airplane.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect affected lap and butt splices, wing-to-body fairing locations, and external repair and cutout reinforcement areas for scribe lines. Perform related investigative and corrective actions if necessary.
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Compliance Time
Within 12 months of effective date
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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, 747-400, 747-400D, 747-400F, 747SR, and 747SP series airplanes.
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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