AD NUMBER: 2007-11-08
MANUFACTURER: Boeing
SUBJECT: Airworthiness Directive 2007-11-08
SUMMARY: The FAA is superseding an existing
airworthiness directive (AD) that applies to all Boeing Model 727
airplanes. The existing AD requires a boost pump dry bay inspection
to detect leakage of fuel through an arced-through conduit, and
corrective action as necessary. The existing AD also requires
repetitive inspections of the in-tank fuel boost pump wiring to
detect chafing of the wire insulation, evidence of electrical
arcing, or arc-through of the conduit wall, and applicable
corrective action; and installation of sleeving over the in-tank
fuel boost pump wires as a method to protect the wiring from
chafing. This new AD removes certain inspection requirements from
the existing AD. This new AD adds new repetitive inspections for
damage of the electrical wire andsleeve that run to the fuel boost
pump through a conduit in the fuel tank, and arcing damage ofthe
conduit and signs of fuel leakage into the conduit; applicable
investigative and corrective actions; and a new repetitive engine
fuel suction feed operational test. Initiation of the new
inspections terminates the requirements of the existing AD. This AD
results from reports of a fuel tank explosion on a Model 727-200F
airplane on the ground; and of chafed wires and a damaged power
cable sleeve of a fuel boost pump that were discovered during an
inspection required by an existing AD on a Model 737-300 airplane.
We are issuing this AD to detect and correct chafingof the fuel
boost pump electrical wiring and leakage of fuel into the conduit,
and to prevent electrical arcing between the wiring and the
surrounding conduit, which could result in arc-through of the
conduit, and consequent fire or explosion of the fuel tank.
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