AD 2005-08-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | 747-200B | Airworthiness Directives; Boeing Model 747-200B, -200C, -200F, and -400F Series Airplanes |
Unsafe Condition
Fatigue cracks found in the crease beam during a follow-on inspection of a previously installed modification, which could result in reduced structural integrity of the frame and consequent rapid decompression of the airplane.
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Required Actions
Accomplish a detailed inspection for cracks in the crease beam and adjacent structure of the fuselage, using Boeing Alert Service Bulletin 747-53A2504. If any crack is found, repair the cracking before further flight. Repeat the inspection at intervals not to exceed 6,000 flight cycles.
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Compliance Time
Within 1,500 flight cycles after the effective date of this AD, or before the accumulation of 10,000 or 14,000 total flight cycles, depending on the airplane group.
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Affected Aircraft
Boeing Model 747-200B, -200C, -200F, and -400F series airplanes, line numbers 604 and subsequent, 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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