AD 2005-20-29
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | 747-100 | Airworthiness Directives; Boeing Model 747-100, 747-100B, 747-100B SUD, 747-200B, 747-300, 747SP, and 747SR Series Airplanes |
Unsafe Condition
Fatigue cracking in the upper chords of the upper deck floor beams, which could result in large deflection or deformation of the upper deck floor beams, leading to damage to wire bundles and control cables for the flight control system, reduced controllability of the airplane, and rapid decompression in the case of multiple adjacent severed floor beams.
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Required Actions
Conduct repetitive inspections to detect cracks in various areas of the upper deck floor beams, and repair if necessary. Inspections must be performed in accordance with Boeing Service Bulletin 747-53A2349, Revision 2, and Boeing Alert Service Bulletin 747-53A2452.
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Compliance Time
Within 750 flight cycles after the effective date of this AD, or within 2,000 flight cycles after the most recent inspection required by paragraph (i) of this AD, whichever is first, for certain inspections. Other inspections have different compliance times based on flight cycle intervals.
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Affected Aircraft
Boeing Model 747-100, 747-100B, 747-100B SUD, 747-200B, 747-300, 747SP, and 747SR series airplanes, as specified in the AD and related service bulletins.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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