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SECTION 7
CESSNA
AIRPLANE AND SYSTEMS DESCRIPTION
MODEL 208B 867 SHP
GARMIN G1000
ELECTRICAL SYSTEM
(Continued)
STANDBY ALTERNATOR POWER SWITCH
The STBY ALT PWR switch is a two-position toggle-type switch,
labeled STBY ALT PWR. There is also an amber LED light located
above the switch that comes on when the BATTERY switch is in the
OFF position with STBY ALT PWR switch in the ON position. This is an
alert to the operator to help prevent accidental discharging of the
battery that can occur if the STBY ALT PWR switch is left ON after
shutdown.
AVIONICS POWER SWITCHES
Electrical power from the airplane power distribution bus to the avionics
buses, refer to Figure 7-12, Electrical System, is controlled by two
toggle-type switch/breakers located on the left sidewall switch and
circuit breaker panel. One switch controls power to the No. 1 avionics
bus while the other switch controls power to the No. 2 avionics bus. The
switches are labeled AVIONICS 1 and 2 and are ON in the forward
position and OFF in the aft position. The AVIONICS power switches
should be placed in the OFF position prior to turning the BATTERY
switch ON or OFF, or applying an external power source. The
AVIONICS No. 1 Switch must be ON prior to engine start to display EIS
information.
AVIONICS STANDBY POWER SWITCH
The AVIONICS STBY PWR switch is a guarded two-position switch/
breaker, labeled AVIONICS STBY PWR. The guard covering this
switch must be lifted in order to select the ON position. When switched
ON, the standby electrical system directly provides power to the AVN
BUS 1. When switched OFF, the standby electrical system may provide
extra power to the avionics buses via the main power distribution bus,
provided the STBY PWR circuit breakers on the electrical buses are not
pulled. When operating solely on standby power, both AVIONICS No. 1
and No. 2 power switches should be OFF to avoid feeding a possible
fault in the primary power system.
7-92
208BPHCUS-00
U.S.
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