AD 2009-12-08
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | 747 | Airworthiness Directives; Boeing Model 747 Airplanes |
Unsafe Condition
Fatigue cracking of the Stringer 11 longeron, which can propagate and cause damage to the adjacent horizontal stabilizer pivot bulkhead, leading to loss of structural integrity and inability of the bulkhead to carry flight loads.
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Required Actions
Inspect for cracks in the left- and right-side Stringer 11 longeron exposed surfaces and edges between Station 2598 and 2607 adjacent to the horizontal stabilizer pivot bulkhead using surface high frequency eddy current (HFEC) inspection. Perform all applicable related investigative and corrective actions before further flight, in accordance with Boeing Service Bulletin 747-53A2703, Revision 1, dated September 16, 2008.
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Compliance Time
Within the compliance times specified in Boeing Service Bulletin 747-53A2703, Revision 1, dated September 16, 2008, or before further flight if cracks are found.
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Affected Aircraft
All Boeing Model 747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747-400, 747-400D, 747-400F, 747SR, and 747SP 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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