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isolation amplifier. The marker beacon receiver receives a 75 MHz carrier signal. The carrier
signal is modulated with these tones:
− Outer marker: 400 Hz.
− Middle marker: 1300 Hz.
− Airways marker: 3000 Hz.
Three colored lenses show when the airplane is over the related beacon. The lenses are marked
A, O and M.
The KMA 24 has these controls for the marker beacon functions:
− TST switch. When you push the TST (test) switch, all 3 lights come on.
− SENS switch. Push the switch in for HI sensitivity. Push the switch again for LO sensitivity.
With HI sensitivity the equipment receives each beacon signal for a longer time. With LO
sensitivity the equipment receives each beacon signal for a shorter time.
To operate the unit set the GEN/BAT switch and AVIONICS MASTER switch to ON. The ICS and
MARKER circuit-breakers must be closed. Turn the MIC selector switch knob clockwise from the
OFF position.
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DA20-C1 AMM
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19 Dec 1997 34-30-00 Doc # DA 201-C1
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Figure 1: KMA 24 Audio\Marker Receiver
DA20-C1 AMM
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Doc # DA 201-C1
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19 Dec 1997
TROUBLE-SHOOTING
1. General
Use the data below to trouble-shoot the audio marker beacon receiver.
Complaint Possible Cause Remedy
Test operates correctly but the
marker does not operate.
Faulty marker receiver.
Poor co-ax connections.
Faulty antenna.
Replace the KMA 24.
Examine the co-ax connectors
for condition and security.
Replace the antenna.
Test does not operate. No power.
Circuit-breaker open or
defective.
Faulty marker receiver.
Do a power check. Do a
continuity test of the ground
and power wires.
Close the circuit-breaker. Or
replace the circuit-breaker.
Replace KMA 24.
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MAINTENANCE PRACTICES
1. General
This part gives you the data to remove/install and adjust/test the marker beacon receiver system on
the airplane. Refer to Chapter 23-50 for data about the audio integrating functions. Refer to the
component manufactures manuals for more data and for shop data.
2. Remove Install the Bendix\King KMA 24 Audio/Marker Receiver
A. Remove the Bendix\King KMA 24
Detail Steps/Work Items Key Items
(1) Open the MARKER and ICS circuitbreakers.
(2) Put a 3/32 allen wrench into the access hole
for the locking screw. Engage the screw.
Refer to Figure 1
(3) Turn the screw counter-clockwise until the
unit disengages from the mounting rack.
CAUTION: DO NOT PULL ON THE KNOBS. DO NOT PRY THE FACE-PLATE.
YOU CAN DAMAGE THE UNIT.
CAUTION: DO NOT TOUCH THE CONNECTOR CARD AT THE REAR OF THE
UNIT. THE ELECTROSTATIC CHARGE ON YOUR BODY CAN
DAMAGE THE UNIT.
(4) Pull gently on the sides of the unit to remove
it from the mounting rack.
(5) Install the protective covers on the rear
connectors of the KMA 24.
B. Install the Bendix\King KMA 24
Detail Steps/Work Items Key Items
(1) Remove the protective covers from the
connectors on the replacement unit.
(2) Slide the unit into the rack. Insert a 3/32” allen wrench into the access
hole for the locking screw.
(3) Turn the locking screw clockwise. Until the unit locks.
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Detail Steps/Work Items Key Items
CAUTION: DO NOT OVER-TIGHTEN THE LOCKING SCREW. YOU CAN
DAMAGE THE LOCKING MECHANISM.
(4) Continue to turn the screw until the unit is
fully installed in the mounting rack.
(5) Close the MARKER and ICS circuitbreakers.
(6) Do a function test.
C. Adjustment/Test KMA 24
If possible, do an operational flight check of the marker receiver functions after the intercom 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 #006-00180-0001 for performance
specifications.
Detail Steps/Work Items Key Items
(1) Do a test of the marker receiver functions.
(2) Press the Test Button. Make sure the three marker beacon lights
come on.
(3) Do a test of the audio panel. Refer also to Chapter 23-50.
3. 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.
DA20-C1 AMM
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