Textron Cessna 172R - Page 258

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
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