Section Iii Operation; Scope; Power Switch (Emg-Fail Safe Operation); Microphone (Xmt) Selection - Honeywell KMA 28B System Installation And Operation Manual

Section III OPERATION

3.1

SCOPE

This section provides detailed operating instructions for the Honeywell KMA 28B, Audio Selector
Panel/Intercom Systems. Please read it carefully before using the equipment so that you can take full ad-
vantage of its capabilities.
This section is divided into four sections covering the basic operating areas of the KMA 28B systems.
They are Audio Selector, Transceiver Selection, Intercom, and Marker Beacon Receiver (Marker version
only).
MARKER INDICATOR LAMPS
MARKER MODE
IINTERC OM MODE
CREW ICS VOLUME (INNER)
PASS ICS VOLUME (OUTER)
Figure 3-1 KMA 28B controls
3.2

Power Switch (EMG-Fail Safe Operation)

Unit power is turned on and off by pushing the volume knob. In the
connected directly to Com 1. This allows communication capability regardless of unit condition. Any time
power is removed or turned
The power switch also controls the audio selector panel functions, intercom and marker beacon receiver.
3.3

Microphone (XMT) Selection

There are six pushbuttons associated with the communications transceivers. The lower buttons control
which transceiver is selected for transmit.
The KMA 28B gives priority to the pilot's PTT. If the copilot it transmitting, and the pilot presses his
PTT, the pilot's microphone will be heard over the selected com transmitter.
The KMA 28B-Series has an automatic selector mode. Audio from the selected transceiver is automati-
cally heard in the headsets and speaker (if selected). You can check this function by switching from C
1 to C 2 and watch the selected audio light on the selector change from COM 1 to COM 2. This en-
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sures the pilot will always hear the audio from the transceiver he is transmitting on.
When switching from C
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to be heard. This eliminates the pilot having to switch Com 1 audio back on, if desired.
D201106000060
Bendix/King
KMA 28B Audio Selector Panel and Intercom System
Installation and Operator's Manual
GENERAL INFORMATION
RECEIVE AUDIO SELECT ORS
BENDIX/KING
TRANSMIT SELECT ORS
, the audio selector will be placed in the fail-safe mode.
OFF
1 to C 2, while C 2 audio had been selected, Com 1 audio will continue
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Page 3-1
KMA 28B TSO
CREW ICS
CD MUTE CONTROL
SPEAKER CONTROL
or "EMG" position, the pilot is
OFF
June 2011
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