AD 2012-13-08
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company | Airworthiness Directives; The Boeing Company Airplanes |
Unsafe Condition
Tension ties are susceptible to widespread fatigue damage, leading to cracks on the forward and aft tension tie channels at station (STA) 740 and STA 760. This could result in tension ties becoming severed or disconnected from the frames, potentially causing rapid in-flight decompression.
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Required Actions
Modify the tension tie structure or tension tie and frame structure at certain stations. Conduct a post-modification inspection of the modified area and post-modification repetitive inspections of the unmodified area, with repair if necessary. Terminate repetitive inspection requirements in the existing AD for modified airplanes.
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Compliance Time
Within 12 months of the effective date of this AD.
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Affected Aircraft
The Boeing Company Model 747-100, 747-100B, 747-200B, 747-200C, 747-200F, 747-400F, 747SR, and 747SP series airplanes, without a stretched upper deck or stretched upper deck modification.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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