AD Amdt-39-10957
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | 747 | Airworthiness Directives; Boeing Model 747 Series Airplanes |
Unsafe Condition
Contact between the rotating paddle wheel and the stationary end plates within the center wing tank override/jettison fuel pumps or horizontal stabilizer tank transfer pumps due to excessive wear of the pump shaft carbon thrust bearing, which could cause sparks and/or a hot surface condition and consequent ignition of fuel vapor during dry pump operation.
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Required Actions
Revise the Airplane Flight Manual to include procedures to prevent dry operation of the center wing fuel tank override/jettison pumps. For certain airplanes, prohibit operation of the horizontal stabilizer tank transfer pumps in flight.
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Compliance Time
Before further flight
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Affected Aircraft
All Boeing Model 747 series airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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