AD 2020-04-11
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company | Airworthiness Directives; The Boeing Company Airplanes |
Unsafe Condition
undetected fatigue cracks, which could result in sudden decompression and loss of structural integrity of the airplane
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Required Actions
repetitive low frequency eddy current (LFEC) inspections of a certain fuselage upper skin lap splice for cracks, repetitive high frequency eddy current (HFEC) inspections of a certain fuselage upper skin lap splice for cracks, and applicable on-condition actions
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Compliance Time
within the compliance times specified in the "Compliance" paragraph of Boeing Alert Requirements Bulletin 747-53A2901 RB, dated July 25, 2019
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Affected Aircraft
The Boeing Company Model 747-400 series airplanes, certificated in any category, as identified in Boeing Alert Requirements Bulletin 747-53A2901 RB, dated July 25, 2019
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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