SECTION
7
AIRPLANE
AND
SYSTEMS DESCRIPTION
AVIONICS SUPPORT EQUIPMENT
CESSNA
MODEL 172S NAV
III
Avionics cooling fans, antennas, microphone and headset
provisions, power converter
and
static discharge wicks support the
operation
of
the avionics equipment installations.
AVIONICS COOLING FAN
Four
DC
electric fans provide forced air
and
ambient air circulation
cooling for the G 1 000 avionics equipment. A single fan
in
the tail
cone provides forced air cooling to the Integrated Avionics Units and
to the Transponder. A fan
located forward of the instrument panel
removes air
from
between
the
firewall bulkhead
and
instrument
panel, directing the warm air
up
at
the inside of the windshield. Two
additional fans blow air directly onto the heat sinks located
on
the
forward sides
of
the
PFD
and
MFD.
Power
is
provided to these fans when the MASTER (BAT) switch
and
the AVIONICS (BUS 1 and BUS
2)
switch are all
ON.
NOTE
None
of
the cooling fans will operate when the
essential bus avionics equipment is being powered
by
the standby battery.
(Continued Next Page)
7-66
U.S.
172SPHAUS-00
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