AD 2000-12-19
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | 747 | Airworthiness Directives; Boeing Model 747 Series Airplanes |
Unsafe Condition
Fatigue cracking found in the upper half of the aft pressure bulkhead, which could result in rapid decompression of the fuselage or overpressurization of the tail section.
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Required Actions
Perform a detailed visual inspection of the upper half of the aft pressure bulkhead to detect cracking, followed by HFEC inspections if no cracking is found. Repair any detected cracking in accordance with Boeing Alert Service Bulletin 747-53A2425 or an approved method.
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Compliance Time
Within 12 months after the effective date of this AD or prior to the accumulation of 20,000 total flight cycles, whichever occurs later.
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Affected Aircraft
Boeing Model 747 series airplanes, as listed in Boeing Alert Service Bulletin 747-53A2425, dated October 29, 1998; certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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