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Short range in transmit mode,
but reception is OK.
Faulty radio. Replace the radio.
Faults not covered with hand mic and speaker:
No voice modulation when
transmitting from one pilots
side. The other pilots side OK.
Audio integrating fault. See Chapter 23-50.
Cannot transmit. Transmit
annunciator not shown in
COMM display.
Faulty mic PTT switch.
PTT wiring circuit open.
Faulty audio panel mic select
switch.
Faulty radio.
Replace defective mic.
Do a test for continuity. See
Chapter 92 for wiring
diagrams.
Replace the audio panel. See
Chapter 23-50.
Replace radio.
Communications
DA20-C1 AMM
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DA20-C1 AMM
Communications
Doc # DA201-C1
Rev. 0 23-10-00 Page 201
19 Dec 1997
MAINTENANCE PRACTICES
1. General
This part gives you the data to remove/install and adjust/test the components of speech
communication systems on the airplane. See the component manufactures manuals for more data
and for shop data.
2. Remove Install the Bendix\King KX 125 NAV COMM
A. Remove the Bendix\King KX 125 NAV COMM
Detail Steps/Work Items Key Items
(1) Open the related NAV COMM circuitbreaker.
(2) Put a 3/32 allen wrench into the access hole
for the locking screw. Engage the screw.
Refer to Figure 2
(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 unit.
B. Install the Bendix\King KX 125 NAV COMM
Detail Steps/Work Items Key Items
(1) Remove the protective covers from the rear
connectors on the unit.
(2) Slide the unit into the rack. Engage the
locking screw so that the latch front lobe
touches the rack.
Refer to Figure 2
Communications
DA20-C1 AMM
Page 202
19 Dec 1997 23-10-00 Doc # DA201-C1
Rev. 0
Detail Steps/Work Items Key Items
(3) Turn the locking screw clockwise so that the
rear lobe engages the mounting rack.
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 NAV COMM circuit-breaker.
(6) Do a function test. See below.
C. Bendix\King KX 125 NAV COMM Adjustment/Test
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 #006-00655-0001 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 operation and accuracy on
a suitable runway.
(5) If necessary, set the viewing contrast of the
LCD display.
Through the small hole in the front panel.
DA20-C1 AMM
Communications
Doc # DA201-C1
Rev. 0 23-10-00 Page 203
19 Dec 1997
3. Remove Install the Bendix\King KLX 135/135A GPS COMM
A. Remove the Bendix\King KLX 135/135A GPS COMM
Detail Steps/Work Items Key Items
(1) Open the related GPS COMM circuitbreaker.
(2) Put a 3/32 allen wrench into the access hole
for the locking screw. Engage the screw.
Refer to Figure 3
(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
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