AD NUMBER: 2007-11-07
MANUFACTURER: Boeing
SUBJECT: Airworthiness Directive 2007-11-07
SUMMARY: The FAA is superseding an existing
airworthiness directive (AD) that applies to all Model 737-00,-200,
-300, -400, and -500 series airplanes. The existing AD currently
requires repetitive detailed inspections for damage of the
electrical wire and sleeve that run through a conduit in the fuel
tank to the fuel boost pump, and related investigative and
corrective actions; as applicable. This new AD removes certain
inspection requirements. This new AD adds 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 fuel leakage into the
conduit; replacement of the sleeve with a new, smaller-diameter
sleeve; and related investigative and corrective actions, as
applicable. This AD also adds airplanes to the applicability.
Accomplishment of the initial new inspection and the sleeve
installation terminates the requirements of the existing AD. This
new 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. 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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