AD 2009-04-16
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | 747-100 | Airworthiness Directives; Boeing Model 747-100, 747-100B, 747-200B, 747-200C, 747-200F, 747-300, 747SR, and 747SP Series Airplanes |
Unsafe Condition
Cracked fastener holes at the right stringer 6 (S-6) lap splice between station (STA) 340 and STA 380, which could lead to cracking in the fuselage skin, rapid decompression, and loss of structural integrity.
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Required Actions
Inspect for acceptable external skin doublers at the left- and right-side S-6 lap splices. If doublers are not found, perform repetitive investigative and corrective actions as specified in the alert service bulletin. Install acceptable external skin doublers at the affected lap splices within the specified compliance times.
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Compliance Time
Within 3,000 flight cycles after initial related investigative actions or within 300 flight cycles after the effective date of this AD, whichever is later.
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Affected Aircraft
Boeing Model 747-100, 747-100B, 747-200B, 747-200C, 747-200F, 747-300, 747SR, and 747SP series airplanes, as identified in Boeing Alert Service Bulletin 747-53A2748, dated May 9, 2008.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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