AD NUMBER: 2007-10-03
MANUFACTURER: Boeing
SUBJECT: Airworthiness Directive 2007-10-03
SUMMARY: The FAA is adopting a new airworthiness
directive (AD) for certain Boeing Model 767-200 and -300 series
airplanes. For certain airplanes, this AD requires repetitive
inspections for discrepancies of the tube assemblies and insulation
of the metered fire extinguisher system and the bleed air duct
couplings of the auxiliary power unit (APU) located in the aft
cargo compartment, and corrective actions if necessary. For certain
other airplanes, this AD requires a one-time inspection for
sufficient clearance between the fire extinguishing tube and the
APU bleed air duct in the aft cargo compartment, and modification
if necessary. This AD also requires an inspection for signs of
chafing and to verify sufficient clearance between the fire
extinguisher system and the bleed air duct couplings of the APU.
This AD results from one report indicating that an operator found a
hole in the discharge tube assembly for the metered fire
extinguishing system; and another report indicating that an
operator found chafing of the fire extinguishing tube against the
APU duct that resulted in a crack in the tube. We are issuing this
AD to prevent fire extinguishing agent from leaking out of the tube
assembly in the aft cargo compartment which, in the event of a fire
in the aft cargo compartment, could result in an insufficient
concentration of fire extinguishing agent, and consequent inability
of the fire extinguishing system to suppress the fire.
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