AD 2001-12-21
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, which could cause sparks and/or a hot surface condition and consequent ignition of fuel vapor in the center wing tank or horizontal stabilizer tank during dry pump operation (no fuel flowing).
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Required Actions
For certain airplanes, install improved fuel pumps. For all airplanes, 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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