Cessna 17273274 Pilot Operating Handbook page 145

SECTION 7
AIRPLANE & SYSTEMS DESCRIPTIONS
overcast; the flashing light reflected from water droplets or particles in the
atmosphere, particularly at night, can produce vertigo and loss of orienta­
tion.
INTERIOR LIGHTING
Instrument panel and switch and control panel lighting is provided by
flood lighting, integral lighting, and post lighting (if installed). Lighting
intensity is controlled by a dual light dimming rheostat equipped with an
outer knob labeled PANEL LT, and an inner knob labeled RADIO LT,
located below the throttle. A slide-type switch (if installed) on the overhead
console, labeled PANEL LIGHTS, is used to select flood lighting in the
FLOOD position, post lighting in the POST position, or a combination of
post and flood lighting in the BOTH position.
Instrument panel and switch and control panel flood lighting consists
of a single red flood light in the forward edge of the overhead console. To
use flood lighting, move the slide switch in the overhead console, labeled
PANEL LIGHTS, to the FLOOD position and rotate the outer knob on the
light dimming rheostat, labeled PANEL LT, clockwise to the desired light
intensity.
Post lights (if installed) are mounted at the edga of each instrument and
provide direct lighting. To use post lighting, move the slide switch in the
overhead console, labeled PANEL LIGHTS. to the POST position and
rotate the outer knob on the light dimming rheostat, labeled PANEL LT
clockwise to obtain the desired light intensity. When the PANEL LIGHTS
switch is placed in the BOTH position, the flood lights and post lights 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 light dimming rheostat labeled RADIO
LT; rotate the knob clockwise to obtain the desired light intensity. How­
ever, for daylight operation, the compass and engine instrument lights
may be turned off while 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 are turned off for daylight operation byrotating 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
7-28
CESSNA
MODEL 172N
1 July 1979