AD NUMBER: 2004-23-01
MANUFACTURER: Pilatus SUBJECT: Airworthiness Directive 2004-23-01 SUMMARY: The FAA adopts a new airworthiness
directive (AD) for certain Pilatus Aircraft Ltd. (Pilatus) Model
PC-7 airplanes with any Lear Romec RR53710B type or Lear Romec
RR53710K fuel booster pump (Pilatus part number 968.84.11.401;
968.84.11.403; or 968.84.11.404) installed. This AD requires you to
check the airplane logbook to determine whether any installed fuel
booster pump has been modified with spiral wrap to protect the wire
leads and has the suffix letter "B" added to the serial number of
the fuel booster pump identification plate. If any installed fuel
booster pump has not been modified, you are required to inspect any
installed fuel booster pump wire lead for defects; if defects are
found, replace the fuel booster pump with a modified fuel booster
pump with spiral wrap that protects the wire leads; or if no
defects are found, install spiral wrap to protect any wire leads
and add the suffix letter "B" to the serial number of the fuel
booster pump identification plate. The pilot is allowed to do the
logbook check. If the pilot can positively determine that the fuel
booster pump wire leads with spiral wrap are installed following
the service information and that the suffix letter "B" is included
in the serial number of the fuel booster pump identification plate,
no further action is required. This AD is the result of mandatory
continuing airworthiness information (MCAI) issued by the
airworthiness authority for Switzerland.We are issuing this AD to
detect and correct any defects in the leads of any fuel booster
pump, which could result in electrical arcing. This failure could
lead to a fire or explosion in the fuel tank.
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