Cessna SkyHawk SP 172S NAV III 2005 Pilot Operating Handbook page 262

SECTION 7
AIRPLANE AND SYSTEMS DESCRIPTION
LIGHTING SYSTEMS
(Continued)
INTERIOR LIGHTING (Continued)
CESSNA
MODEL 172S NAV III
Avionics panel lighting consists of the PFD and MFD bezel and
display lighting, Audio Panel lighting, and, if installed, KAP 140
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Flight Computer keys and display lighting. Rotating the AVIONICS
dimmer, found on the switch panel in the DIMMING group, controls
the lighting level. Positioning the dimmer control in the OFF
position, rotated fUlly counterclockwise, causes the avionics displays
to use internal photocells to automatically control the lighting levels.
This is the recommended use of the avionics lighting for all day and
lower lighting levels where lighting of the avionics bezels and keys
is not required. In low to night lighting levels rotating the dimmer
control clockwise from the OFF position places all avionics lighting
level control to the AVIONICS dimmer control. This is the
recommended use of avionics lighting for night and low lighting
conditions to allow the pilot control of the avionics illumination levels
as dark adaptation occurs.
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Rotating the STDBY IND dimmer, found on the switch panel in the
DIMMING group, controls lighting of the standby airspeed indicator,
attitude indicator, altimeter and non-stabilized magnetic compass.
Rotating the dimmer counterclockwise decreases light intensity from
the highest level to off.
Pilot's chart lighting is accomplished by use of a rheostat and a light
assembly, both found on the lower surface of the pilot's 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 the NAV light switch ON, and then adjust the map light intensity
using the knurled rheostat knob. Rotating the dimmer clockwise
increases light intensity, and rotating the dimmer counterclockwise
decreases light intensity.
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172SPHAUS-03