AD 2009-25-11
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | 747-100 | Airworthiness Directives; Boeing Model 747-100, 747-100B, 747-100B SUD, 747-200B, 747-300, 747-400, 747SR, and 747SP Series Airplanes |
Unsafe Condition
A crack found in a body frame with a tapered side guide bracket at fuselage station 1800, located on the left side between stringers 39 and 40; the frame was severed. This could result in loss of structural integrity of the fuselage, leading to rapid depressurization of the airplane.
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Required Actions
Perform detailed visual inspections for frame cracking from fuselage section 540 to 760, and 1820 to 1900, stringers 35 left to 42 left. Inspections must be conducted within specified compliance times based on landing counts. If any crack is found, repair must be done before further flight using an approved method.
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Compliance Time
Within specified landing counts based on the airplane's landing history as of September 17, 1986, or before further flight if a crack is found.
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Affected Aircraft
Boeing Model 747-100, 747-100B, 747-100B SUD, 747-200B, 747-300, 747-400, 747SR, and 747SP series airplanes, certificated in any category, as identified in Boeing Alert Service Bulletin 747-53A2749, dated September 25, 2008.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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