AD 2016-05-12
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company | Airworthiness Directives; The Boeing Company Airplanes |
Unsafe Condition
Fatigue cracking of the tension ties, shear webs, and frames of the upper deck, which could result in rapid decompression and reduced structural integrity of the airplane.
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Required Actions
Inspect for cracking and discrepancies of certain fasteners; modify the frame-to-tension-tie joints; perform repetitive post-modification inspections; conduct investigative and corrective actions if necessary; inspect for cracking in the tension tie channels and repair if necessary; inspect the angle installation and re-install if necessary; inspect fastener locations where the tension tie previously attached to the frame and repair if necessary; add a new inspection for cracking in the tension tie channels; and perform post-modification inspections of the modified tension ties for cracking and repair if necessary.
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Compliance Time
Within the applicable compliance times specified in Boeing Alert Service Bulletin 747-53A2559, Revision 2, dated May 13, 2014, for Group 3 through 5, Configuration 1 airplanes.
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Affected Aircraft
The Boeing Company Model 747-100B SUD, 747-300, 747-400, 747-400D series airplanes; and Model 747-200B series airplanes having a stretched upper deck.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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