AD NUMBER: 2007-24-02
MANUFACTURER: Boeing
SUBJECT: Airworthiness Directive 2007-24-02 SUMMARY: The FAA is
superseding an existing airworthiness directive (AD) that applies
to all Model 737-100, -200, -200C, -300, -400, and -500 series
airplanes. The existing AD currently requires repetitive detailed
inspections for damage of the electrical wire and sleeve that run
to the fuel boost pump through a conduit in the fuel tank, and
arcing damage of the conduit and signs of fuelleakage into the
conduit; replacement of the sleeve with a new, smaller-diameter
sleeve; and related investigative and corrective actions, as
applicable. This new AD reduces the inspection threshold for
certain airplanes. This AD results from a report of a fuel tank
explosion on a Model 727-200F airplane on the ground, and a report
of chafed wires and a damaged power cable sleeve of a fuel boost
pump discovered during an inspection on a Model 737-300 airplane.
(Thefuel boost pump installation on certain Model 737 airplanes is
almost identical to the installation on Model 727 airplanes.) We
are issuing this AD to detect and correct chafing of 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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