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If possible, do an operational flight check after the radio has been replaced. Alternatively, use a
NAV COMM test set to make sure that the system operates correctly. Refer to the Bendix\King
Installation manual #006-00179-0006 for performance specifications.
Detail Steps/Work Items Key Items
(1) Do a test of each control function. See this Chapter and Chapter 34-50
(2) At a sufficient altitude, contact a ground
station at least 50 miles away and another
close by.
If possible use frequencies at both the low
and high ends of the VHF COMM band.
(3) Test the VOR system at 4000 ft. Select a
VOR frequency within 40 miles range.
Listen to the station identifier. Test the
operation of the tone identifier filter. Fly inbound
and out-bound on a selected VOR
radial. Look for the correct LEFT-RIGHT
and TO-FROM indications. Monitor the VOR
accuracy.
(4) Do a test of LOC/GS operation and accuracy
on a suitable runway.
(5) Do a test of the DME remote channeling. If installed.
DA20-C1 AMM
Communications
Doc # DA201-C1
Rev. 15 23-10-00 Page 211
30 Apr 2009
7. Antennas
Use a thin coat of ‘Penatrox’ (Manufacturer: Burndy) or ‘Noalox’ (Manufacturer: Ideal) corrosion
inhibitor between the aluminum antenna backing plate and the copper foil ground plane. Apply a
bead of Dow Corning 732 RTV around the antenna to give a waterproof seal.
8. Connectors
Remove contacts from connectors in the radio rack with Hand Ejector Tool Molex part number HT-
1884. Crimp solderless contact terminals with Molex part number 6115.
Remove contacts from KI 208/209 connectors with Burndy part number RXK20-25 Extraction Tool
Tip and part number RXT20-4P3 Extraction Tool Handle. Crimp Burndy Socket part number
SC20M-6TK6 with Burndy Hytool M8ND.
Communications
DA20-C1 AMM
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DA20-C1 AMM
Communications
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Rev. 0 23-50-00 Page 1
19 Dec 1997
CHAPTER 23-50
AUDIO INTEGRATING
1. General
The DA20-C1 has a voice-activated (VOX) intercom. This gives hands-free intercom when headsets
are used.
Press-to-transmit switches are installed in the handle of each control stick. The mic and phone
jack-sockets are located between the pilot’s seats at shoulder height. There is also a mic jacksocket
on the left side of the instrument panel. The optional cabin speaker can be installed below
the pilot’s seat.
In single installations the integral speaker amplifier in the COMM equipment operates the (optional)
cabin speaker. In dual installations, an audio panel with speaker amplifier is installed which
operates the cabin speaker.
Communications
DA20-C1 AMM
Page 2
19 Dec 1997 23-50-00 Doc # DA201-C1
Rev. 0
Figure 1: PM 501 Intercom
DA20-C1 AMM
Communications
Doc # DA201-C1
Rev. 0 23-50-00 Page 3
19 Dec 1997
2. Description
A. PM 501 Intercom
Figure 1 shows the PM 501 intercom. The PM 501 is a 4 channel VOX intercom with individual
amplifiers for each output. The headset jack-plugs connect to the PM 501. When the unit is set
to OFF (or when the power fails), an internal relay connects the pilots headset to the aircraft
radio. This gives fail-safe operation.
The PM 501 has these controls:
− A PUSH-ON/VOLUME knob. Push the knob to turn the intercom ON. Turn the knob to
control the volume in all of the headsets.
− A SQUELCH knob. The squelch knob adjusts the level at which the mic operates the
intercom. When the knob is set fully counter-clockwise, the ambient noise operates the
intercom. This gives a ‘Hot mic’ effect. Set the squelch to operate the intercom at a level
which is correct for you. The VOX system has a 1 second delay. This prevents ‘choppy
speech’.
− An ISO/ALL switch. The PM 501 has 2 modes of operation:
ALL. The pilot and co-pilot can hear the airplane radio. Both pilots can communicate on
the intercom.
ISO. The pilot is connected only to the airplane radio. He is isolated from the intercom.
The co-pilot cannot make or hear transmissions on the airplane radio.
Communications
DA20-C1 AMM
Page 4
19 Dec 1997 23-50-00 Doc # DA201-C1
Rev. 0
Figure 2: KMA 24 Audio/Marker Receiver
DA20-C1 AMM
Communications
Doc # DA201-C1
Rev. 0 23-50-00 Page 5
19 Dec 1997
B. Bendix\King KMA 24 Audio\Marker Receiver
Figure 2 shows the KMA 24 Audio\Marker Receiver. The Bendix\King KMA 24 Audio\Marker
Receiver has these main components:
− A speaker isolation amplifier.
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