CESSNA SECTION 7
MODEL 172S NAV III AIRPLANE AND SYSTEM DESCRIPTION
GFC 700 AFCS
U.S.
ELECTRICAL SYSTEM (Continued)
CIRCUIT BREAKERS AND FUSES
Individual system circuit breakers are found on the circuit breaker panel
below the pilot's control wheel. All circuit breakers on ESSENTIAL
BUS, AVIONICS BUS 1 and AVIONICS BUS 2 are capable of being
opened, or disengaged from the electrical system, by pulling straight
out on the outer ring for emergency electrical load management. Using
a circuit breaker as a switch is discouraged since the practice will
decrease the life of the circuit breaker. All circuit breakers on
ELECTRICAL BUS 1, ELECTRICAL BUS 2 and CROSSFEED BUS
are not capable of being opened or disengaged.
The power distribution module uses three push-to-reset circuit breakers
for the electrical bus feeders. A fast blow automotive type fuse is used
at the standby battery. The standby battery current shunt circuit uses
two field replaceable fuses located on the standby battery controller
printed circuit board.
Most Garmin G1000 equipment has internal non-field replaceable
fuses. Equipment must be returned to Garmin by an approved service
station for replacement.
(Continued Next Page)
172SPHBUS-00
7-57
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