AD 2001-13-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | 747-100 | Airworthiness Directives; Boeing Model 747-100, -200, -300, and 747SP Series Airplanes |
Unsafe Condition
Missing or damaged alloy-steel taperlock fasteners in the diagonal brace underwing fittings could result in separation of the engine and strut from the airplane.
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Required Actions
Inspect the diagonal brace underwing fittings for missing or alloy-steel taperlock fasteners. Replace missing or alloy-steel fasteners with new fasteners, which terminates repetitive inspections. Perform an open-hole high frequency eddy current (HFEC) inspection to detect cracks, corrosion, or damage at the bolt hole locations of the aft 10 taperlock fasteners in the diagonal brace underwing fitting.
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Compliance Time
Before further flight
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Affected Aircraft
Boeing Model 747-100, -200, -300, and 747SP series airplanes equipped with titanium diagonal brace underwing fittings, as listed in Boeing Alert Service Bulletin 747-57A2312, dated June 15, 2000.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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