AD 2011-06-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company Model 747 | Airworthiness Directives; The Boeing Company Model 747 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
Measure the electrical bond resistance between the MOV actuators and airplane structure for the main, center, auxiliary, and horizontal stabilizer fuel tanks, as applicable, and take corrective action if necessary. Revise the maintenance program to incorporate airworthiness limitation (AWL) No. 28-AWL-21 or AWL No. 28-AWL-27, as applicable. Replace production-installed laminate phenolic spacers with metallic spacers between the fuel jettison MOV and the airplane structure, as applicable.
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Compliance Time
Within 12 months of the effective date (April 26, 2011)
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Affected Aircraft
The Boeing Company Model 747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747-400, 747-400D, 747-400F, 747SR, and 747SP series airplanes, certificated in any category; as identified in Boeing Service Bulletin 747-28A2292, Revision 3, dated December 9, 2010.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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