AD 2006-24-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | 747 | Airworthiness Directives; Boeing Model 747 Airplanes |
Unsafe Condition
Fatigue cracks in the fuselage skin in section 41, particularly at the fastener rows, could join together and cause a loss of structural integrity and rapid decompression of the airplane.
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Required Actions
Conduct repetitive inspections for any cracking of the fuselage skin in section 41 using surface high-frequency eddy current (HFEC) inspections or, as a short-term alternative, external detailed inspections around fastener heads. If cracks are found, repair them according to the applicable Boeing 747 Structural Repair Manual or contact Boeing for repair data. Send inspection results to the manufacturer.
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Compliance Time
Within 150 flight cycles after the date of the alert service bulletin, before the accumulation of 8,000 total flight cycles, or within 2,000 flight cycles after the last HFEC inspection, whichever occurs last.
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Affected Aircraft
Boeing Model 747 airplanes with fuselage skin in section 41 that may be subject to cyclic loading during cabin pressurization and de-pressurization.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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