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− A headphone isolation amplifier.
− A marker beacon receiver.
The KMA 24 has these controls:
− A mic selector switch. This switch has OFF, TEL, COM1, COM2, INT and EXT settings.
This switch connects the mic audio and PTT to the related radio. It also turns on the
speaker amplifier.
− A top row of push-buttons which set the avionic equipment to be heard on the speaker.
The end right AUTO button automatically connects the COMM set by the mic selector
switch to the speaker.
− A bottom row of push-buttons which set the avionic equipment to be heard on the
headphones. The end right AUTO button automatically connects the COMM set by the
mic selector switch to the headphones.
− A TEST switch. (Described in 34-30-00)
− A SENS switch. (Described in 34-30-00)
A 3-part display on the left of the panel has lights for the inner, middle and outer marker
functions (See Chapter 34-30).
When the PTT button is pressed, the KMA 24 cuts the output to the speaker.
To operate the unit set the GEN/BAT switch and AVIONICS MASTER switch to ON. The ICS
(for headphone amplifier) and Marker (for speaker amplifier) circuit-breakers must be closed.
Turn the Mic selector switch clockwise from the OFF position to the radio which you will use.
Push the top selector button for the equipment you wish to hear on the speaker. And push the
bottom selector button for the equipment which you wish to hear on the headphones.
The speaker amplifier operates when the mic selector switch is not set to OFF. The headphone
amplifier operates at all times.
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TROUBLE-SHOOTING
1. General
Use the data below to trouble-shoot the audio integrating system.
Complaint Possible Cause Remedy
No voice modulation when
transmitting from co-pilot’s side
on headset. Pilots side OK.
Faulty headset.
Open mic audio line.
Faulty PM 501.
Replace headset.
Do a test of the mic audio
wiring. See Chapter 92 for
wiring diagrams.
Replace the intercom.
No voice modulation when
transmitting from pilot’s side on
headset. Co-pilots side OK.
Faulty headset.
Open mic audio line.
Faulty PM 501.
Replace headset.
Do a test of the mic audio
wiring. See Chapter 92 for
wiring diagrams.
Set the intercom to OFF. If
the pilot can transmit with the
intercom OFF, replace the
intercom.
Cannot transmit. Transmit
symbol not shown in COMM
display.
Faulty mic PTT switch.
PTT wiring circuit open.
Faulty audio panel mic select
switch.
Faulty COMM unit.
Replace the defective mic.
Do a test of the mic audio
wiring. See Chapter 92 for
wiring diagrams.
Replace the audio panel.
Replace the COMM unit.
No intercom (PM 501) audio on
pilot’s headsets. Receives
radio transmissions correctly.
Mode switch in ISO position.
Faulty intercom.
Set mode switch to ALL.
Replace the intercom.
No audio on pilot’s headset with
PM 501 turned OFF.
Faulty headset.
Open audio line.
Replace headset.
Do a test of the headset audio
wiring. See Chapter 92 for
wiring diagrams.
No audio on co-pilot’s headset. Faulty headset.
Open audio line.
Faulty PM 501.
Replace headset.
Do a test of the headset audio
wiring. See Chapter 92 for
wiring diagrams.
Replace the intercom.
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MAINTENANCE PRACTICES
1. General
This part gives you the data to remove/install and adjust/test the components of the audio
integrating system on the airplane. See the component manufactures manuals for more data and
for shop data.
2. Remove Install the PM 501 Intercom
A. Remove the PM 501 Intercom
Detail Steps/Work Items Key Items
(1) Open the ICS circuit-breaker.
(2) Remove the instrument panel cover. Refer to Chapter 25-10
(3) Disconnect the connector from the unit.
(4) Remove the mounting screws and knobs
from the unit.
Hold the unit!
(5) Remove the unit from the instrument panel.
B. Install the PM 501 Intercom
Detail Steps/Work Items Key Items
(1) Put the unit in position in the instrument
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