Cessna 182S Pilot Operating Handbook page 199

SECTION 7 CESSNA
MODEL 182S
AIRPLANE & SYSTEMS DESCRIPTION
The annunciator panel can be tested by turning the Master
Switch On and holding the annunciator panel switch in the TST
position. All amber and red messages will flash until the switch is
released.
NOTE
When the Master Switch is turned ON, some annunciators
will flash for approximately 10 seconds before illuminating
steadi ly. When the TST switch is toggled up and held in
TST position , all remaining lights will flash until the switch is
released.
MASTER SWITCH
I
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.
I
A
CAUTION
PRIOR TO TURNING THE MASTER SWITCH ON
OR OFF, STARTING THE ENGINE OR APPLYING
AN EXTERNAL POWER SOURCE, THE AVIONICS
MASTER SWITCH, LABELED AVIONICS MASTER,
SHOULD BE TURNED OFF TO PREVENT ANY
HARMFUL TRANSIENT VOLTAGE FROM
DAMAGING THE AVION ICS EQU IPMENT.
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 AL T side of the switch,
when placed in the off position, removes the alternator from the
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 wil l reduce battery power low
enough to open the battery contactar, remove power from the
alternator field, and preve nt alternator restart.
7-34
Nov 15/00