AD 2020-18-12
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company | Airworthiness Directives; The Boeing Company Airplanes |
Unsafe Condition
The FAA has determined that an unsafe condition exists due to the potential for an ignition source inside the center fuel tank due to electrical fault conditions, which, 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
Modifying the fuel quantity indicating system (FQIS) to prevent development of an ignition source inside the center fuel tank due to electrical fault conditions. Alternative actions for cargo airplanes include modifying the FQIS or installing a nitrogen generating system (NGS).
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Compliance Time
Within 50 flight hours
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Affected Aircraft
The Boeing Company Model 777-200, -200LR, and -300 series airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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