Cirrus Design Section 7
SR22T Airplane and Systems Description
P/N 13772-003 7-53
Avionics Power Switch
A rocker switch, labeled AVIONICS, controls electrical power from the
circuit breaker panel (MAIN BUS 1) to the Avionics Bus. The switch is
located next to the ALT and BAT Master switches. Typically, the switch
is used to energize or de-energize all non-essential avionics on the
AVIONICS bus simultaneously. With the switch in the OFF position, no
electrical power will be applied to the non-essential avionics
equipment, regardless of the position of the MASTER switch or the
individual equipment switches. For normal operations, the AVIONICS
switch should be placed in the OFF position prior to activating the
MASTER switches, starting the engine, or applying an external power
source.
Ground Service Receptacle
A ground service receptacle is located just aft of the cowl on the left
side of the airplane. This receptacle is installed to permit the use of an
external power source for cold weather starting and maintenance
procedures requiring reliable power for an extended period. The
external power source must be regulated to 28 VDC. The external
power control contactor is wired through the BAT 1 MASTER switch so
that the BAT 1 switch must be 'on' to apply external power.
Refer to Section 8, Ground Handling, Servicing, and Maintenance, for
use of external power and special precautions to be followed.
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