AD 2016-07-31
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company | Airworthiness Directives; The Boeing Company Airplanes |
Unsafe Condition
Fatigue cracking in certain upper chords of the upper deck floor beam, which could become large and cause the floor beams to become severed, resulting in rapid decompression or reduced controllability of the airplane.
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Required Actions
Conduct repetitive inspections to detect cracks in the floor panel attachment fastener holes of certain upper deck floor beam upper chords. Perform corrective actions if necessary, including replacement of the upper deck floor beam upper chords.
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Compliance Time
Within the compliance times specified in Boeing Alert Service Bulletin 747-53A2688, Revision 2, dated August 21, 2014.
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Affected Aircraft
The Boeing Company Model 747-400 and -400D series airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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