Cessna 172P - Page 245

the
ground
servioe
plug
receptacle
circuit
incorporates a
polarity
reversol
protection.
Power
from the external
power
source
will flow only it
the
ground
servioe
plug
is
correctly connocted
to the aiqplane.
If tùte
plug
is
accidentally
connected backwards,
no
power
will
flow to the eleotrioal
system,
thereby
preventing
any
damage to eleotrical equipnent.
The
following check shoulà be
made after engine start
and removal of
the external
power
sourcer
if there is any
question
ae
to the oonflition
of the
battery.
L. Master Switch
--
OFF.
2. Taxi and
Landing Light Switches
--
ON.
3. Engine RPM
--
REDUCE
to idle.
4, Master Switch
--
ON
(with
taxi
and
landing lights turned on),
5. Engine RPM
--
INCREASE
to
approximately
1ã00 F,PM.
6. Ammetor
and Low-Voltage lVarning
Light
-- CHECK.
NOTE
If
the ammeter
does
not show a oharge or
the low-voltage
warning
light does
not
go
out,
the
battery
should be
removed
from the airplane
and
properly
serviced
prior
to
flight.
PILOT'S OPERATING
HANDBOOK
SUPPI,EMENT
There is
service
plug
6
GR,OUND
SER,VICE PLUG
RECEPTACLE
MODEL
17åP
sEciloN
5
PERFORMANCE
no change to
the airplane
performance
when
the
ground
receptacle is
installed.
30 May 1980
3/(4
blank)