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AIRCRAFT
DA 40 Series
AMM
Navigation
Doc # 6.02.01
Rev. 5 34-56-00 Page 101
20 Sep 2007
Trouble-Shooting
1. General
The table below lists the defects you could have with the transponder system. If you have the trouble
detailed in the Trouble column read across to the Possible Cause column. Then do the repair given
in the Repair column.
Trouble Possible Cause Repair
Transponder does not operate.
Reply indicator does not come
on when TST selected.
Faulty transponder.
No power.
Poor ground connection.
Replace the transponder.
Repair faulty wiring, circuitbreaker
etc.
Do a test of the ground
connection.
ATC reports no reply.
Transponder reply indicator
flashes.
Low output power. Examine the antenna
connections.
Replace the transponder.
ATC reports no reply.
Transponder reply indicator
does not flash.
Airplane 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 the
transponder.
Wiring open-circuit between
encoder and transponder.
Do a mode C fault analysis.
Replace the encoder.
Replace the transponder.
Repair/replace the wiring.
Refer to the wiring diagrams in
Chapter 92.
AIRCRAFT
Navigation
DA 40 Series
AMM
Trouble Possible Cause Repair
Page 102
20 Sep 2007 34-56-00 Doc # 6.02.01
Rev. 5
Encoded altitude output is too
high or too low over a steady
range of altitudes. The airplane
altimeter reads correctly.
Faulty encoder.
Encoder requires calibration.
Replace the encoder.
Calibrate the encoder. Refer to
the manufacturers manuals.
Altitude read-out is -800 ft. Encoder not warmed-up. Let the encoder warm-up
(Refer to the blind encoder
fault analysis in this Section).
AIRCRAFT
DA 40 Series
AMM
Navigation
Doc # 6.02.01
Rev. 5 34-56-00 Page 201
20 Sep 2007
Maintenance Practices
1. General
These maintenance practices tell you how to remove/install the transponder and the blind altitude
encoder. They also tell you how to adjust/test the transponder and do fault analysis on the blind
encoder.
2. Remove/Install the Transponder
A. Remove the Transponder
Detail Steps/Work Items Key Items/References
(1) Open the transponder circuit-breaker.
(2) Put a 3/32 Allen wrench into the access hole for
the locking screw. Engage the screw.
Refer to Figure 1 (KT 76A) or Figure 2
(KT 76C) or Figure 3 (GTX 327).
(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. IF
YOU PULL ON THE KNOBS, OR 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 transponder.
AIRCRAFT
Navigation
DA 40 Series
AMM
Page 202
20 Sep 2007 34-56-00 Doc # 6.02.01
Rev. 5
B. Install the Transponder
Detail Steps/Work Items Key Items/References
(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.
(3) Turn the locking screw clockwise so that the rear
lobe engages the mounting rack.
Refer to Figure 1 (KT 76A) or Figure 2
(KT 76C) or Figure 3 (GTX 327).
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 transponder circuit-breaker.
(6) Do an operational test. Refer to Paragraph 4.
AIRCRAFT
DA 40 Series
AMM
Navigation
Doc # 6.02.01
Rev. 5 34-56-00 Page 203
20 Sep 2007
3. Remove/Install the Blind Altitude Encoder
A. Remove the Blind Altitude Encoder
Detail Steps/Work Items Key Items/References
(1) Open the XPDR circuit breaker.
　
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