AD Amdt-39-10250
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | 747 | Airworthiness Directives; Boeing Model 747 Series Airplanes |
Unsafe Condition
Chafing of the Teflon sleeving and wire bundles of the boost pumps for the numbers 1 and 4 main fuel tanks and auxiliary tank jettison pumps (if installed) could result in electrical arcing between the wires and the aluminum conduit, leading to fire or explosion of the fuel tank.
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Required Actions
Conduct repetitive inspections to detect damage of the sleeving and wire bundles; replace damaged sleeving with new sleeving; repair or replace damaged wires with new wires. For airplanes with burned wires, inspect and replace damaged conduit with a serviceable conduit. Submit a report to the FAA of any damage found during the initial inspection.
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Compliance Time
Before further flight
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Affected Aircraft
Boeing Model 747 series airplanes, all line numbers (previously limited to 001-432, now expanded to include 433-1120 inclusive), equipped with boost pumps for numbers 1 and 4 main fuel tanks and auxiliary tank jettison pumps (if installed).
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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