AD 2009-10-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | 747-400 and 747-400D | Airworthiness Directives; Boeing Model 747-400 and 747-400D Series Airplanes |
Unsafe Condition
Cracks found in the Section 41 upper deck floor beam upper chords, 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 the floor panel attachment fastener holes of the Section 41 upper deck floor beam upper chords using open-hole or surface high frequency eddy current methods. Perform applicable related investigative and corrective actions as specified in Boeing Alert Service Bulletin 747-53A2688. Repair any cracks found before further flight using an approved method.
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Compliance Time
Within the compliance times specified in Boeing Alert Service Bulletin 747-53A2688, unless already done.
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Affected Aircraft
Boeing Model 747-400 and 747-400D series airplanes, certificated in any category, as identified in Boeing Alert Service Bulletin 747-53A2688, dated August 21, 2008.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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