SECTION 7
AIRPLANE AND SYSTEMS DESCRIPTION
ELECTRICAL SYSTEM (Continued)
LOW VOLTAGE ANNUNCIATION (Continued)
CESSNA
MODEL 172S NAV
III
ALT FIELD circuit breaker may open
on
occasion during normal
engine starts due to transient overvoltages. Provided that normal
alternator output is resumed after the
AL
T FIELD circuit breaker is
reset, these occurrences are considered nuisance events.
If
the
AL
T FIELD circuit breaker opens after reset,
do
not close again.
Repeated occurrences indicate a
problem with the electrical system
that must
be
corrected
by
a qualified maintenance technician before
flight.
CIRCUIT BREAKERS AND FUSES
Individual system circuit breakers
are
found
on
the circuit breaker
panel below the pilot's control wheel.
All
circuit breakers
are
"pullable" for electrical load management. Using a "pullable"
circuit breaker as a switch is discouraged since the practice will
decrease the
life
of
the circuit breaker.
The
Power Distribution Module uses three 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 G 1
000 equipment has internal non-field replaceable
fuses. Equipment must
be
returned to Garmin by
an
approved
service station for replacement.
EXTERNAL POWER RECEPTACLE
A external power receptacle is integral to the power distribution
module and allows the
use
of
an
external power source for cold
weather starting
or
for lengthy maintenance work
on
electrical
and
avionics equipment. The receptacle is located
on
the left side of the
cowl
near the firewall. Access to the receptacle is gained
by
opening the receptacle door.
(Continued Next Page)
7-52
U.S.
172SPHAUS-00
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