AD 2014-20-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company | Airworthiness Directives; the Boeing Company Airplanes |
Unsafe Condition
The upper deck floor beams are subject to widespread fatigue damage (WFD), the existing inspection program is not sufficient to maintain an acceptable level of safety, and the upper chords of the upper deck floor beam of section 42 are subject to cracking, which could lead to failure of the floor beams and consequent loss of controllability, rapid decompression, and loss of structural integrity of the airplane.
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Required Actions
Inspect the upper chords of the upper deck floor beam of section 41 for cracking, and perform corrective actions if necessary. Replace the upper chords, straps (or angles), and radius fillers of certain upper deck floor beams in section 41. Add repetitive inspections of the upper chords of the upper deck floor beam of section 42, and perform repetitive replacements of the upper chords. Conduct post-replacement inspections for both sections 41 and 42, and take corrective actions if necessary.
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Compliance Time
Within the compliance times specified in Table 1 of paragraph 1.E. of Boeing Alert Service Bulletin 747-53A2696, Revision 1, dated April.
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Affected Aircraft
All The Boeing Company Model 747-200C and -200F series airplanes, certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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