CESSNA
MODEL 172S
MASTER SWITCH
SECTION
1
AIRPLANE & SYSTEMS DESCRIPTION
•
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.the
battery 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 .
.
~
~
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
power switch must also 'be turned on. The
ALI
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 entire
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 4
7-33
Содержание Cessna 172S Skyhawk SP
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