Textron Cessna 172R, Pilot Operating Handbook

Page: 258 / 500

SECTION 7
AIRPLANE
&
SYSTEMS DESCRIPTION
CESSNA
MODEL 172R
IGlareshield
lighting is provided 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 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.
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
8
All manuals and user guides at all-guides.com