AD 2000-08-21
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | 747 | Airworthiness Directives; Boeing Model 747 Series Airplanes |
Unsafe Condition
Fatigue cracking of the forward and aft inner chords and the splice fitting of the forward inner chord of the station 2598 bulkhead, which could result in reduced structural capability of the bulkhead and the inability of the structure to carry horizontal stabilizer flight loads.
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Required Actions
Conduct repetitive inspections to detect cracking of the forward and aft inner chords and the splice fitting of the forward inner chord of the station 2598 bulkhead, using high frequency eddy current (HFEC) and detailed visual inspections as specified in Boeing Alert Service Bulletin 747-53A2427, Revision 1. Repair any detected cracking in accordance with the alert service bulletin or the Boeing 747 Structural Repair Manual (SRM), as applicable.
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Compliance Time
Before further flight
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Affected Aircraft
All Boeing Model 747 series airplanes, 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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