AD 2019-23-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company | Airworthiness Directives; The Boeing Company Airplanes |
Unsafe Condition
The potential for a fuel tank ignition source to occur from the FQIS due to its design architecture, component design details, and installation design details, 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 body-mounted auxiliary fuel tanks due to electrical fault conditions, or deactivating the body-mounted auxiliary fuel tanks.
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Compliance Time
Within 50 flight hours
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Affected Aircraft
The Boeing Company Model 727 airplanes equipped with Boeing body-mounted auxiliary fuel tanks.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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