AD NUMBER: 2008-22-08
SUBJECT: Airworthiness Directive 2008-22-08 SUMMARY: We are adopting a
new airworthiness directive (AD) for certain Boeing Model 757-200
and 757-300 series airplanes.
This AD requires installing a bonding jumper between a ground
and the clamp on the tube of the forward and aft gray water
composite drain masts. For certain airplanes, this AD requires
inspecting existing aft bonding jumper assemblies that might be too
short, repair if necessary, and replacing the bonding jumper
assembly with a new, longer bonding jumper assembly if
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 afire near a composite drain
mast and possible disruption of the electrical power system due to
a lighting strike on a composite drain mast, which could result in
the loss of several functions essential for safe flight.