AD 2013-22-11
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
Inspect Section 41 and Section 44 upper deck floor beam upper chords for cracks in the floor panel attachment fastener holes, and take corrective actions if necessary. Perform repetitive post-repair and post-modification inspections, and take corrective actions if necessary. Replace the upper deck floor beam upper chords as specified.
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Compliance Time
Within the applicable times specified in Tables 1 through 4 of Boeing Service Bulletin 747-53A2688, Revision 1, dated September 19, 2012.
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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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