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) ALL. The pilot, co-pilot and passengers can all hear the radio. Both the pilots and the
passengers can communicate on the intercom.
) ISO. The pilot is connected only to the airplane radio. He is isolated from the intercom. The
co-pilot can communicate with the passengers but the co-pilot can not make or hear
transmissions on the airplane radio.
) CREW. The pilot and co-pilot are connected on one intercom channel while the passengers
are on a separate and independent channel. The pilot and co-pilot are connected to the
airplane radio. Passengers can continue to communicate with themselves without disturbing
the pilot and co-pilot.
AIRCRAFT
Communications DA 40 Series
AMM
Page 4
20 Sep 2007 23-50-00 Doc # 6.02.01
Rev. 5
Marker Beacon
Indicator Lamps
Pilot/Co-Pilot
Intercom
Volume
Mounting
Screw
Crew ICS/Music
1 Mute
Speaker
Switch
Transmit
Indicator
Swap
Indicator
Intercom Mode
Select
Receive Audio
Selectors
Mic Selector
Marker BeaconSensitivity
& Test/Mute Select
COM 1 Nav 1 MKR ADF DME COM 2
COM 3
Transmit Swap
COM 1
COM 2/1
TEL
COM 2 Nav 2 ICS AUX SPR
HI
LO
T/M
ISO
ALL
CREW
BENDIX/KING KMA 28 TSO
Figure 2: Bendix/King KMA 28 Audio Amplifier/Intercom/Marker Beacon Receiver
AIRCRAFT
DA 40 Series
AMM
Communications
Doc # 6.02.01
Rev. 5 23-50-00 Page 5
20 Sep 2007
B. Bendix/King KMA 28 Audio Amplifier/Intercom/Marker Beacon Receiver
(1) KMA 28, General
Figure 2 shows the Bendix/King KMA 28 Audio Amplifier/Intercom/Marker Beacon Receiver. It
is mounted above the NAV/COM 1 set in the avionics rack in the instrument panel, see Chapter
31.
The KMA 28 is a solid state audio isolation amplifier and audio selector with an automatic voice
activated (VOX) intercom system. It can switch up to 3 transceivers (COM 1, COM 2, COM 3)
and 6 receivers (NAV 1, NAV 2, ADF, DME, MKR and AUX). COM 3 and AUX are not used in
this installation.
A rotary switch selects one of the communication transceivers for the pilot and co-pilot. Either
the pilot or co-pilot can transmit on the selected transceiver. In 'Split' mode, the pilot can operate
one transceiver while the co-pilot operates the other.
If the power to the system fails, (or if the selector panel is turned off), an Emergency Mode
connects the pilot's headset to COM 1.
The audio selector panel has a voice-activated (VOX) intercom system. The system has
automatic adjustment. The system has a separate amplifier for each microphone. Only the
microphone in use is selected. A VOL control knob sets the volume for both pilots. Intercom
squelch is automatic.
The audio selector panel has a three-light marker beacon receiver. It gives the marker beacon
lights and audio signals necessary for an ILS approach.
(2) KMA 28 Audio Selector Functions
The audio selector panel has these controls:
) Audio Selector Buttons. You can select the audio to be heard in the headsets by 2
momentary and 6 latched push-button switches (buttons).
• COM 1 and COM 2 are the momentary switches. The rotary microphone switch controls
which transceiver is heard. You will always hear the audio from the transceiver selected
for transmit by the rotary microphone switch.
• NAV 1, NAV 2, MKR (marker), ADF, AUX (auxiliary), and DME latch in to select the
related audio when you press them. The button un-latches when you press it again.
AIRCRAFT
Communications DA 40 Series
AMM
Page 6
20 Sep 2007 23-50-00 Doc # 6.02.01
Rev. 5
) Speaker amplifier. The SPR (speaker) is a 'latched' type switch. When the button is 'latched',
it will place all selected audio on the cockpit speaker. The button un-latches when you press
it again.
) Key Click. You can select a ‘click' to occur over the audio system when you press a button.
Press and hold both the COM 1 and COM 2 buttons for 5 seconds to select the key click.
Press and hold both the COM 1 and COM 2 buttons again for 5 seconds to de-select the key
click.
Each button has a green LED. The green LED comes ON when you select the button.
(3) KMA 28 Intercom Functions
) VOX-Squelch. The system has an automatic volume control for each microphone. The circuit
only operates when the system detects speech in the microphone. The system blocks
continuos tones.
) VOL Control. The VOL control knob adjusts the loudness of the intercom for the pilot and
co-pilot. It has no effect on the radio levels.
) Intercom Modes. The lower switch on the left side is a three-position mode switch. It has the
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