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30 Apr 2009 34-50-00 Doc # DA 201-C1
Rev. 15
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DA20-C1 AMM
Navigation
Doc # DA 201-C1
Rev. 0 34-50-00 Page 101
19 Dec 1997
TROUBLE SHOOTING
1. General
Use the data below to trouble-shoot the dependent position determining systems.
A. Transponder
Complaint Possible Cause Remedy
Unit does not operate. Reply
lamp does not come on when
TST selected.
Faulty transponder.
No power.
Poor ground connection.
Replace the transponder.
Repair faulty wiring, circuitbreaker
etc.
ATC reports no reply.
Transponder reply lamp
flashes.
Low output power. Examine the antenna
connections.
Replace the transponder.
ATC reports no reply.
Transponder reply lamp does
not flash.
Aircraft out of radar range.
Poor received signal.
Faulty transponder.
Do a test at higher altitude.
Examine the antenna
connections.
Replace the transponder.
ATC reports mode A does not
operate. Mode C operates
correctly.
Faulty transponder. Replace the transponder.
Encoded altitude is wrong at
one or more altitudes but is
correct at most other altitudes.
Data code bit missing.
Faulty encoder.
Faulty mode C part of
transponder.
Wiring open-circuit between
encoder and transponder.
Detailed mode C fault
analysis (see chapter 34-10).
Replace the encoder.
Replace the transponder.
Repair the wiring.
Encoded altitude output is too
high or too low over a steady
range of altitudes. The aircraft
altimeter indicates correctly.
Faulty encoder.
Encoder requires calibration.
Replace the encoder.
Calibrate the encoder.
(see chapter 34-10).
Altitude read-out is -800 ft. Encoder not warmed-up. Let the encoder warm up.
(see chapter 34-10).
Navigation
DA20-C1 AMM
Page 102
19 Dec 1997 34-50-00 Doc # DA 201-C1
Rev. 0
B. NAV - Bendix\King KX 125 VOR, LOC, KI 208
Complaint Possible Cause Remedy
NAV flag on both LCD display
and KI 208.
Faulty NAV receiver.
Transmitting station is off the
air.
Poor co-ax connections.
Faulty antenna.
Replace KX 125.
Tune to a new station.
Examine co-ax connections
for condition and security.
Replace the antenna.
NAV flag on KI 208 only. Faulty KI 208.
Faulty wiring.
Replace the KI 208.
Repair the wiring.
LOC indication not accurate on
LCD display. KI 208 correct.
Faulty NAV receiver. Replace KX 125.
LOC indication not accurate on
KI 208 display. LCD correct.
LOC centering adjustment
needed.
Faulty KI 208.
Adjust LOC centering
(Bendix\King installation
manual #006-00140-0002).
Replace KI 208.
VOR indication not accurate on
LCD display.
Faulty NAV receiver. Replace KX 125.
VOR indication not accurate on
KI 208 display. LCD correct.
VOR centering adjustment
needed.
Faulty KI 208.
Adjust VOR centering
(Bendix\King installation
manual #006-00140-0002).
Replace KI 208.
DA20-C1 AMM
Navigation
Doc # DA 201-C1
Rev. 0 34-50-00 Page 201
19 Dec 1997
MAINTENANCE PRACTICES
1. General
This part gives you the data to remove/install and adjust/test the components of the dependent
position determining systems on the airplane. Refer to 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
connectors on the replacement 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
Navigation
DA20-C1 AMM
　
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