AD 2016-07-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company | Airworthiness Directives; The Boeing Company Airplanes |
Unsafe Condition
The upper chords of the upper deck floor beams are subject to widespread fatigue damage (WFD), 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 for cracks at the floor panel attachment fastener holes; conduct repetitive inspections for cracks in the upper and lower chords of the upper deck floor beams at permanent fastener locations; conduct repetitive inspections for cracks in certain repaired and modified areas; replace the upper chords of the upper deck floor beams, including pre-replacement inspections and corrective action if necessary; and perform post-replacement repetitive inspections and repair if necessary.
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Compliance Time
Before further flight
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Affected Aircraft
The Boeing Company Model 747-100, 747-100B, 747-100B SUD, 747-200B, 747-300, 747SR, and 747SP series airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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