AD 2010-14-08
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company Model 747-400 | Airworthiness Directives; The Boeing Company Model 747-400, 747-400D, and 747-400F Series Airplanes |
Unsafe Condition
Uncommanded operation of certain override/jettison pumps could cause overheat, electrical arcs, or frictional sparks, and could lead to an ignition source inside a fuel tank. This condition, in combination with flammable fuel vapors, could result in a fuel tank explosion and consequent loss of the airplane.
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Required Actions
Install new pump control and time delay relays, do related investigative and corrective actions if necessary, and change the wiring for the center and main fuel tank override/jettison fuel pumps. For certain airplanes, install new relays and wiring for the horizontal stabilizer override/jettison fuel pumps. Revise the maintenance program to incorporate Airworthiness Limitation No. 28-AWL-24 and No. 28-AWL-26. For certain airplanes, install an automatic shutoff system for the horizontal stabilizer tank fuel pumps and install new integrated display system software.
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Compliance Time
Before further flight
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Affected Aircraft
The Boeing Company Model 747-400, 747-400D, and 747-400F series airplanes, with specific exclusions for airplanes without horizontal stabilizer tanks or where the horizontal stabilizer tank system has been deactivated in accordance with Boeing Service Bulletins.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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