CESSNA
MODEL 172R (180 HP)
SECTION 7
AIRPLANE & SYSTEMS DESCRIPTION
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 lights 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.
Back lighting intensity for the radios and instrument lighting for the
RH nav indicators, in the pilot's panel, is controlled by the TST
(TEST) - BAT (DAY) - DIM (NIGHT) switch. When the switch is in
the BAT (DAY) position, this lighting may be off regardless of the
RADIO LT dimmer position. Some earlier aircraft will always have
this lighting controlled by the RADIO LT dimmer.
Pilot control wheel lighting is accomplished by use of a rheostat
and light assembly, located underneath the pilot control wheel.
Thel
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.
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
until maintenance has been performed.
I
Oct 4/01
7-39
Summary of Contents for 172R180HP
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