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CESSNA
MODEL 172R
SECTION
7
AIRPLANE
&
SYSTEMS DESCRIPTION
MASTER
SWITCH
The
master
switch
is a split rocker
type
switch labeled
MASTER,
and is
ON
in
the up
position
and
OFF
in
the
down position.
The|
right half of
the switch, labeled
BAT,
controls all electrical
power
to
the
airplane.
The
left half,
labeled
ALT,
controls
the
alternator.
A
CAUTION
PRIOR
TO TURNING
THE MASTER SWITCH ON
OR OFF, STARTING THE ENGINE OR APPLYING
AN EXTERNAL
POWER
SOURCE,
THE
AVIONICS
MASTER SWITCH
SHOULD BE TURNED OFF
TO
PREVENT ANY
HARMFUL TRANSIENT VOLTAGE
FROM DAMAGING
THE AVIONICS
EQUIPMENT.
I
\
Normally,
both sides of
the master switch should be used
simultaneously;
however, the
BAT
side of the switch could be turned
on
separately to
check equipment while
on
the
ground.
To check or
use
avionics equipment
or
radios while on the
ground,
the avionics
master
switch
must
also
be turned on. The
ALT
side
of
the
switch,
when placed
in
the OFF position, removes the alternator from
thel
electrical
system.
With this
switch
in
the
OFF
position, the
entirel
electrical load is placed on the battery. Continued operation with the
alternator
switch
in
the
OFF position will
reduce
battery
power
low|
enough
to
open
the battery
contactor,
remove
power from
the
alternator
field,
and
prevent
alternator
restart.
Revision
8
7-33
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