,SECTION
7
AIRPLANE & SYSTEMS DESCRIPTION
CESSNA
MODEL 172S
I
Glareshield
lighting is provoided by either
a
fluorescent
light or a
series
of
LED
lights
recessed
into
the
lower
surface
of
the
glareshield.
This light is controlled
by rotating the GLARESHIELD
LT dimmer, located below the nav indicators. Rotating the dimmer
clockwise
increases
light
intensity,
and
rotating
the
dimmer
counterclockwise
decrease light intensity.
.
Pedestal lighting consists of a single, hooded light located above
the fuel selector.This
light is controlled by rotating the PEDESTAL
LT dimmer, located below the nav indicators. Rotating the dimmer
clockwise
increases
light
intensity,
and
rotating
the
dimmer
counterclockwise
decreases light intensitY.
Panel lighting is accomplished
using individual lights mounted in
each instrument
and gauge. These light~ are wired in parallel and
are controlled
by the PANEL LT. dimmer,
located below the nav
indicators.
Rotating the dimmer clockwise .increases light intensity,
and rotating the dimmer counterclockwise
decreases light intensity ..
I
Pilot control wheel lighting is accomplished
by use of a rheostat
and light assembly, located underneath the pilot control wheel. The
light provides downward illumination from the bottom of the control
wheel to the pilot's lap area. To operate the light, first turn on the
NAV light switch, then adjust the map light intensity with the knurled
rheostat
knob.
Rotating
the
dimmer
clockwise
increases
light
intensity, and rotating the dimmer counterclockwise
decreases
light
intensity.
In addition
to the RADIO LT dimmer,
lighting intensity for the
avionics displays and the NAV indicators.(pilot's
panel) is controlled
by the annunciator panel test switch.
When the .switch is in the BRT
position (earlier serial number airplanes) or the DAY position (later
serial number airplanes), this lighting may be off regardless of the
RADIO LT dimmer position.
Regardless
of the light system in question,
the most probable
cause of a light failure is a burned out bulb. However, .in the event
any of the lighting systems fail to illuminate when turned on, check
the appropriate
circuit breaker.
If the circuit breaker
has opened,
and there is no obvious indication of a short circuit (smoke or odor),
turn off the light switch of the affected light, reset the breaker, and
turn the switch on again. If the breaker opens again, do not reset it.
7-38
Revision 4
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