Textron 172R180HP, Pilot Operating Handbook

Page: 301 / 396

CESSNA
MODEL 172R
SECTION 9 - SUPPLEMENTS
SUPPLEMENT 3 - FAA APPROVED
SUPPLEMENT
BENDIX/KING KMA 26 AUDIO SELECTOR PANEL
SECTION 1
GENERAL
The Bendix/King KMA 26 Audio Selector Panel is a combination
audio amplifier, an audio distribution panel intercom, and a marker
beacon receiver. The audio amplifier is for amplification of the
audio signals for the speaker system. All receiver audio distribution
functions are controlled by two rows of pushbuttons. A rotary
selector switch on the right side of the console connects the
microphone to either EMG, Com 1, Com 2, Com 3 or PA (Unused
position). All operating controls are shown and described in Figure
1.
A crystal-controlled superheterodyne marker beacon receiver
with 3-light presentation is incorporated within the unit. Dimming
circuitry for the marker lamps automatically adjusts brightness
appropriate to the cockpit ambient light level. Hi and Lo sensitivity
and lamp test functions are also provided.
Light dimming for the audio control panel is manually controlled
by the RADIO light rheostat knob.
MARKER FACILITIES
MARKER IDENTIFYING TONE
Inner,
Continuous 6 dots/sec (3000 Hz)
Airway &
Fan
Middle Alternate dots and dashes (1300 Hz)
Outer 2 dashes/sec ( 400 Hz)
Dec 2/96
"When the identifying tone is keyed, the
respective indicating light will blink
accordingly.
LIGHT"'
White
Amber
Blue
S3-3