AD 2006-25-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | McDonnell Douglas | MD-11F | Airworthiness Directives; McDonnell Douglas Model MD-11F Airplanes |
Unsafe Condition
Unprotected auxiliary power unit (APU) power feeder wires come into close proximity to the upper surface of the auxiliary 'piggy back' fuel tank, which could result in a potential ignition source and, in combination with flammable fuel vapors, could cause a fuel tank explosion and consequent loss of the airplane.
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Required Actions
Perform a general visual inspection for installation of conduit and chafing damage on the APU feeder wires and upper surface of the auxiliary fuel tank. If protective conduit is not installed and no chafing is found, install sleeving and high temperature tape, and replace clamps below the cabin floor beams. If chafing is found, repair any damaged APU power feeder wires and any damaged upper surface of the auxiliary fuel tank structure, and install sleeving and high temperature tape, and replace clamps below the cabin floor beams.
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Compliance Time
Before further flight
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Affected Aircraft
McDonnell Douglas Model MD-11F airplanes with unprotected APU power feeder wires in close proximity to the upper surface of the auxiliary 'piggy back' fuel tank.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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