AD 2013-05-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company | Airworthiness Directives; The Boeing Company Airplanes |
Unsafe Condition
Electrical current flowing through a motor-operated valve (MOV) actuator into a fuel tank, which could create a potential ignition source inside the 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
Inspect the part number of the MOV actuators of the main and center fuel tanks; replace MOV actuators with part number MA20A1001-1 with new MOV actuators; measure the electrical resistance of the bond from the adapter plate to the airplane structure, and perform corrective actions if necessary.
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Compliance Time
Before further flight
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Affected Aircraft
The Boeing Company Model 777-200, -200LR, -300, and -300ER series airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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