Honeywell KMA 29 Marine Instruments User Manual

Audio Panel Operation
Rev. 1
Pressing any of the communication (COM) or navigation (NAV, ADF,
DME, AUX, or MKR) audio selector buttons enables the associated
audio and the LED above the button is lit. Pressing the same audio
selector button again turns the audio for that channel and the LED
above the button off. The pilot and copilot can select and listen to more
than one communication or navigation audio at a given time.
When two KMA 29 audio panels are installed, both have access to the
communications transceivers. When both panels have selected the
same transmitter, the KMA 29 designated as the pilot position has prior-
Indication arrows above the microphone selectors indicate which side
has selected the radio for transmit. Offside radio indication is user selec-
table. When the offside indication is off, only the mic select arrow for the
KMA 29 position is active. When on, the pilot can see which radio the
copilot has selected for transmit, and vice versa, by noting which of the
arrows is illuminated.
To toggle the offside transmit selection indication, press the right side of
the SPLIT button three (3) times within one and a half (1 1/2) seconds.
When the mode is activated, the NAV 1 indicator blinks once. When the
mode is toggled off, the NAV 1 indicator blinks twice. This mode
remains in effect until changed by the user, including power cycles.
NOTE: In the event of a failure or loss of power to the audio panel, the
PUSH EMG/OFF power switch should be pressed. When
pressed, both pilots’ microphones are directly connected to the
COM 1.
The PUSH EMG/OFF (Power On and Emergency/Off) switch is a two
position switch. One position is On (implied) and the other position is
EMG/OFF. The Emergency and Off modes of operation are identical.
In the EMG/OFF position, the pilot is connected directly to COM 1 trans-
mit and COM 1 receive through the headphones only. This allows com-
KMA 29 Audio Panel Pilot’s Guide