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CESSNA
MODEL
172N
SECTION
7
AIRPLANE & SYSTEMS DESCRIPTIONS
The
warning light may
be
tested
by
turning
on
the
landing lights
and
momentarily turning off the ALT portion of the master switch while
leaving
the
BAT portion turned
on.
CIRCUIT BREAKERS AND
FUSES
Most
of the
electrical circuits
in
the
airplane
are
protected
by
"push-to-
reset" type
circuit
breakers mounted on the
left
side of the switch
and
control
panel.
However, alternator output
is protected by
a
"pull-off"
type
circuit
breaker.
In
addition to the individual
circuit
breakers, a toggle
switch/circuit
breaker,
labeled
AVIONICS
POWER, on
the
left
side
of
the
switch
and
control panel
also protects the avionics systems.
The
cigar
lighter
is protected by
a
manually-reset
type
circuit breaker
on
the back
of
the
lighter,
and
a
fuse behind the
instrument
paneI.
The
controlwheel
map
tight (if installed) is
protected by the NAV LT
circuit
breaker
and
a
fuse
behind
the
instrument
paneI.
Electrical circuits which
are not
protected
by
circuit
breakers
are the
battery contactor closing (external
power)
circuit,
clock circuit,
and
flight
hour recorder circuit.
These
circuits
are
protected
by
fuses
mounted adjacent to the battery.
GROUND SERVICE PLUG
RECEPTACLE
A ground
service
plug
receptacle may
be
installed
to
permit
the
use
of
an external power
source
for
cold weather
starting
and
during lengthy
maintenance work
on
the electrical
and
electronic equipment. Details of
the ground service plug receptacle are presented
in
Section
9, Supple-
ments.
LIGHTING SYSTEMS
EXTERIOR LIGHTING
Conventional navigation lights
are
located
on the
wing tips
and
top
of
the rudder.
A
single landing
light is
Iocated
in
the cowl
nose cap.
Dual
Ianding/taxi lights
are available and also located
in
the cowl
nose
cap.
Additional lighting is available
and
includes
a
flashing
beacon
mounted
on top of
the
vertical fin,
a
strobe
light
on each
wing tip,
and
a
courtesy
Iight
recessed
into
the
lower surface
of each
wing slightly
outboard
of
the
cabin
doors.
Details
of the strobe
light
system
are
presented
in
Section
9,
Supplements. The courtesy
lights
are operated
by the
DOME LIGHTS
switch
located
on the
overhead console; push the
switch
to
the
right
to
turn
the lights on. The remaining exterior lights are
operated
by
rocker
switches
located
on
the
left switch
and
control
panel; push
the
rocker
up
to
the
ON
position.
The
flashing
beacon
should not
be
used
when
flying
through
clouds
or
1
July
1979
7-27
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