Section
VIII
Handling,
Serv
and
Maint
BEECHCRAFT
Duchess
76
I
6.
2. Use only an auxiliary power source that is negatively
grounded which has a voltage of 28.0
-+-
.2 vdc (M£-
183 and after). For M£-1 through ME-182 voltage:
14.0 ±
.2
vdc. If the polarity of the power source is
unknown,
determine
the polarity with a voltmeter
before connecting the unit to the airplane.
3.
Before connecting an auxiliary power source, turn OFF
all radio equipment, the alternator switches, and turn
ON the battery switch.
Turn
the
auxiliary
power
source
OFF
prior
to
connecting the external power cable to the auxiliary
power source. Connect the positive clamp of the cable
to the positive terminal
of
the power source and the
negative clamp to
the
negative terminal
of
the power
source. (If a battery
is
used as the power source,
connect the positive terminal of the
cable
to the
positive terminal of the power source
or
battery. Isolate
the negative cable clamp.)
5. Connect the external power cable into the external
power receptacle. Turn the auxiliary power source ON.
(If a battery is used as the power source, connect the
negative cable clamp to the negative terminal of the
power source
or to a suitable ground point.)
On 14-volt airplanes only, the battery switch must be
ON
to
connect the auxiliary power source
to
the
airplane bus.
I
4.
I
Observe the following precautions when disconnecting
an
external power source:
1. Turn the aUXiliary power source OFF. (If a battery has
been used for a power source, disconnect the negative
clamp of the external power cable and isolate it.)
2. Remove the external power cable from the airplane
receptacle. Replace the protective cover
in
the external
power receptacle.
3. Disconnect the external power cable from the auxiliary
power source.
8-12
April
1979
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