AD 2006-08-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | 747-200C and -200F | Airworthiness Directives; Boeing Model 747-200C and -200F Series Airplanes |
Unsafe Condition
Fatigue cracking in the upper chord of the upper deck floor beams could extend and sever floor beams at a floor panel attachment hole location, resulting in rapid decompression and loss of controllability of the airplane.
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Required Actions
Inspect the upper deck floor beams for fatigue cracking in accordance with Boeing Alert Service Bulletin 747-53A2439, Revision 1, dated March 10, 2005. Repair any identified cracking as necessary. Reduce the compliance time for all initial inspections and reduce the repetitive inspection interval for certain inspections.
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Compliance Time
Within 90 days of the effective date for airplanes that have accumulated 17,000 or more total flight cycles as of the effective date.
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Affected Aircraft
Boeing Model 747-200C and -200F series airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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