Cessna 172P - Page 153

CESSNA
MODEL 172P
SECTION
?
AIRPLANE & SYSTEMS
DESCR,IPIIONS
tight dimming
rheostat,
labeled
PANEL
LT, ctockwise
to the desired
light
intensity.
Post lights
(if
installed)
are mou
sürument
and
provide
direot
lighting.
To use
posü switch
in the
óverhead
console,
tabeled
PANEL
position and
rotate
the outer
knob
on the
light dimming
rheostat,
labeled
PANEL
LT'
clockwise
to obtain
the desirod
light intensity.
When the
PANEL
LIGHTS
switch
is
placed
in
the BOTH
position,
the flood
lights and
post
ligbts
will
operate
simultaneouslY.
The engine
instrument cluster
(if
post
lights are installed)'
radio
equipment,
and magnetic
compass have integral
lighting
and
operate
independently
of
post
or flood
lighting. The
intensity of this
lighting
is
controlled by
the
inner knob
on
the
tight dimming
rheostat
labeled
F,ADIO
LT; rotate
the knob olookwise
to obtain the
desired light
intensity.
How-
ever, for daytight
operation,
tho compass
and
engine instrument
lights
may be turned off
white still
maintaining maximum
light intensity
for the
digital readouts
in the radio
equipment. This
is accomplished
by rotating
the
RADIO
LT knob
full counterclockwise. Check
that the
flood
lights/
post
lights
aro turnod
off
for daylight operation by
rotating the
PANEL LT
knob
full
counterclockwise.
A cabin dome
light, in the aft
part
of the overhead
console, is operated
by
a
switch near
the
light. To
turn the light
on, move
the switch
to
the right.
A control wheel
map light is available and
is mounted on the bottom
of
the
pilot's
control
wheel The
light
illuminates
the lower
portion
of the
cabin
just
forward of the
pilot
and is helpful
when
checking
maps and other
flight data during
night
operations. To operate
the light,
first
turn
on
the
NAV LT switch; then
adjust the
map light's
intensity
with
the
knurled
disk
type rheostat control
located
at the bottom of
the control wheel.
A doorpost
map light
is
located on the left forward
doorpost. It
contains
both
red
and white
bulbs and
may be
positioned
to illuminate
any area
desired by the
pilot.
The light is controlled by
a switch, below the
light,
which is labeled RED, OFF, and
IVHITE. Placing
the
switch in
the top
position
will
provide
a red
light.
In the bottom
position,
standard
white
Iighting is
provided.
In the
center
position,
the map light is turned off. Red
light intensity is controlled by the outer knob on the light
dimming
rheostat labeled
PANEL LT.
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, checkthe
appropriate
circuit breaker. Ifthe
circuitbreaker
has
opened
(white
button
popped
out), and there is no
obvious
indication
of
a
30
May 1980
7-29