Beechcraft Duchess 76 - Starting Engines Using Auxiliary Power Unit

I
Section IV
Normal
Procedures
CAUTION
BEECHCRAFT
Ouchess76
I 1.
Exercise caution when connecting the external
power cable to prevent shorting the battery to
the airframe
or arcing the clamps of the cable
together.
Make certain the battery switch is
ON and all avionics,
and electrical switches are OFF, and a battery is in the
system before connecting
an external power unit. This
protects the voltage regulators and associated
electrical equipment from voltage transients (power
fluctuations).
)
2. The airplane has a negative ground system. Be sure to
connect the positive lead of the auxiliary power unit to
the positive terminal of the airplane's external power
receptacle and the negative lead of the auxiliary power
unit to the negative terminal of the external power
receptacle.
3.
To prevent arcing, make certain no power is being
supplied when the connection is made.
STARTING ENGINES USING AUXILIARY POWER UNIT
I 1.
2.
3.
4.
I
4-8
Battery Switch - ON
Alternators, Electrical and Avionics Equipment -
OFF
Auxiliary Power Unit - CONNECT
Auxiliary Power Unit - SET OUTPUT 13.5 to 14.25
volts (If 28-volt system - SET OUTPUT 27.0 to 28.5
volts)
April 1979