AD 92-24-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 747-100B Series | Airworthiness Directives; BOEING Model 747-300, 747-400, and 747-100B Series Airplanes |
| aircraft | The Boeing Company | 747-100B SUD Series | Airworthiness Directives; BOEING Model 747-300, 747-400, and 747-100B Series Airplanes |
| aircraft | The Boeing Company | 747-300 Series | Airworthiness Directives; BOEING Model 747-300, 747-400, and 747-100B Series Airplanes |
| aircraft | The Boeing Company | 747-400 Series | Airworthiness Directives; BOEING Model 747-300, 747-400, and 747-100B Series Airplanes |
| aircraft | The Boeing Company | 747-400D Series | Airworthiness Directives; BOEING Model 747-300, 747-400, and 747-100B Series Airplanes |
| aircraft | The Boeing Company | 747-400F Series | Airworthiness Directives; BOEING Model 747-300, 747-400, and 747-100B Series Airplanes |
Unsafe Condition
Failure of the upper floor beams and probable interference with the control cables, which could result in reduced controllability of the airplane.
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Required Actions
Conduct a high frequency eddy current inspection of the BS 860 and BS 980 upper deck floor beams to detect cracks. If cracks are found, repair them prior to further flight. If no cracks are found, reinforce the beams in accordance with Boeing Service Bulletin 747-53-2327.
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Compliance Time
Prior to the accumulation of 20,000 flight cycles, or within 1,000 flight cycles after the effective date of this AD, whichever occurs later. For modified airplanes, prior to the accumulation of 20,000 flight cycles after incorporation of the stretched upper deck modification, or within 1,000 flight cycles after the effective date of this AD, whichever occurs later.
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Affected Aircraft
Boeing Model 747-300, 747-400, and 747-100B series airplanes delivered with stretched upper decks, and Boeing Model 747 series airplanes modified to have stretched upper decks, as listed in Boeing Service Bulletin 747-53-2327.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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