Electrical System - Piper Cheyenne IIXL PA-31T2 1981 Pilot Operating Handbook

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PIPER AIRCRAFT CORPORATION SECTION 7
PA-31T2, CHEYENNE II XL DESCRIPTION & OPERATION
7.25 ELECTRICAL SYSTEM
Electrical power is supplied by a 28 volt, direct current, negative ground
electrical system. Two 30 volt, 200 ampere, D.C. starter/ generators in
parallel provide torque for engine starting and generate D.C. electrical
power. One 24 volt, 36 ampere hour air-cooled nickel-cadmium battery,
located in the nose section behind the nose cone, furnishes power for engine
starting and also serves as a reserve source of emergency electrical power in
the event of a dual generator failure. The electrical system is automatically
protected from overvoltage and reverse current.
An external power receptacle, located on the underside of the nose
section, allows the use of an external auxiliary power source for starting the
engines or to allow an extended ground check of electrical equipment.
CAUTION
Do not allow external auxiliary power to be
applied to the airplane before ensuring that the
battery master switch, condition levers,
ignition switches, starter switches, radio master
switch, and inverter power switch are all OFF.
During an external start, monitor the airplane
voltmeter until the reading stabilizes (27 volts
minimum - 30 volts maximum), and then turn
the battery master switch ON. Generator
switches are to be OFF until the engines are
running.
ISSUED: DECEMBER
21, 1983
REPORT:
2272
7-24a