AD 2013-24-18
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company | Airworthiness Directives; The Boeing Company Airplanes |
Unsafe Condition
Reports of cracks of both lower chords and web on certain outboard struts. If the chord severs, it could result in reduced structural integrity of the diagonal brace load path and of the strut-to-wing attachment, and consequent separation of a strut and engine from the airplane during flight.
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Required Actions
Perform detailed inspections for cracking of the lower spar chords and web, high frequency eddy current (HFEC) inspections for cracking of the lower spar chords, and all applicable repairs and modifications. Repeat inspections at intervals not to exceed 600 flight cycles. Perform lower spar chord modification, including open-hole HFEC inspections for cracking in the chord and all applicable corrective actions. Complete all applicable corrective actions before further flight.
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Compliance Time
Within the compliance times specified in Boeing Alert Service Bulletin 747-54A2237, dated March 14, 2013.
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Affected Aircraft
The Boeing Company Model 747-200B, 747-200C, 747-200F, 747-300, and 747SR series airplanes, certificated in any category, as identified in Boeing Alert Service Bulletin 747-54A2237, dated March 14, 2013.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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