AD 2002-23-21
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | 747 | Airworthiness Directives; Boeing Model 747 Series Airplanes |
Unsafe Condition
Corrosion and cracks found in certain bolt holes of the fail-safe bar of the flap tracks of the wing trailing edge flaps, which could result in separation of the flap and consequent loss of control of the airplane.
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Required Actions
Inspect the forward four bolt holes on each side of the affected trailing edge flap tracks for corrosion and adequate cadmium plating. If cadmium plating is inadequate or corrosion is found, conduct an eddy current inspection for cracks. If necessary, cadmium plate the affected bolt holes and conduct subsequent inspections as specified.
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Compliance Time
Within 2,000 flight cycles after March 11, 1991, or before further flight if cadmium plating is inadequate or corrosion is found.
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Affected Aircraft
Boeing Model 747 series airplanes, as listed in Boeing Service Bulletin 747-57-2256, Revision 3, dated June 21, 2001; 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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