Wed, Apr 23, 2008
AD NUMBER: 2008-08-22
SUBJECT: Airworthiness Directive 2008-08-22
SUMMARY: We are adopting a new airworthiness directive
(AD) for certain Boeing Model 737-600, -700,-700C, -800, and -900
This AD requires a one-time inspection to determine the material
of the forward and aft gray water drain masts. For airplanes having
composite gray waterdrain masts, this AD requires installation of a
bonding jumper between a ground and the clamp on the tube of the
forward and aft gray water composite drain masts.
This AD results from a report of charred insulation blankets and
burned wires around the forward gray water composite drain mast
found during an inspection of the forward cargo compartment on a
Model 767-300F airplane.
We are issuing this AD to prevent a fire near a composite drain
mast and possible disruption of the electrical power system caused
by a lightning strike on a composite drain mast,which could result
in the loss of several functions essential for safe flight.
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