Fri, Jun 03, 2011
AD NUMBER: 2011-11-05
MANUFACTURER: The Boeing Company Model
DC-10-10, DC-10-10F, DC-10-15, DC-10-30, DC-10-30F (KC-10A and
KDC-10), DC-10-40, DC-10-40F; Model MD-10-10F, MD-10-30F, MD-11,
and MD-11F Airplanes
SUBJECT: Airworthiness Directive 2011-11-05
SUMMARY: The FAA is superseding an existing
airworthiness directive (AD) for the products listed above. That AD
currently requires an inspection to determine if a certain fuel
pump housing electrical connector is installed. The existing AD
also requires a revision to the FAA-approved airplane flight manual
(AFM) to advise the flightcrew of the appropriate procedures for
disabling certain fuel pump electrical circuits following failure
of a fuel pump housing electrical connector if applicable. The
existing AD also requires the deactivation of certain fuel tanks or
fuel pumps and the installation of placards if applicable. The
existing AD allows the optional replacement of the fuel pump
housing electrical connectors with new, improved parts, which would
terminate the AFM revisions, deactivation of certain fuel tanks and
fuel pumps, and placard installation.
This new AD instead requires replacing the fuel pump housing
electrical connector assembly with a new part and doing repetitive
inspections for continuity, resistance, and insulation resistance,
and doing corrective actions if necessary. This AD was prompted by
reports of failures of a certain fuel pump housing electrical
connector.
The FAA has issued this AD to detect and correct insulation
resistance degradation and arcing in the potted backside of the
electrical connector assembly of the fuel boost/transfer pump
housing, which could compromise its performance and cause an
ignition source in the fuel tank, resulting in a fuel tank
explosion and consequent loss of the airplane.
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