AD 2007-23-12
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | 707 | Airworthiness Directives; Boeing Model 707 Airplanes and Model 720 and 720B Series Airplanes |
Unsafe Condition
Failures of the fuel pumps or fuel quantity indication system (FQIS) could result in a potential ignition source inside the fuel tank, which, in combination with flammable fuel vapors, could lead to a fuel tank explosion and consequent loss of the airplane.
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Required Actions
Conduct an airplane survey within 12 months to define system configurations and repair any discrepancies before further flight. Modify the fuel system within 72 months by installing lightning protection for the FQIS, ground fault relays for fuel boost pumps, and redundant power relays for center tank fuel pumps and uncommanded on-indication lights.
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Compliance Time
Within 12 months for the survey and within 72 months for the fuel system modifications.
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Affected Aircraft
All Boeing Model 707-100 long body, -200, -100B long body, -100B short body series airplanes; Model 707-300, -300B, -300C, and -400 series airplanes; and Model 720 and 720B series airplanes, certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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