Page 204 Doc # 6.02.01 09 Jan 2003 Rev. 4
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Navigation
AMM

Section 34-56
Transponder (XPDR)

1. General
This Section tells you about the transponder system which can be installed in the DA 40. Refer to the manufacturer's manuals for more data about the equipment. Refer to Chapter 92 for the wiring diagrams.
The transponder system consists of the following items: ) Transponder. One of the following transponders can be installed in the DA 40: ) Bendix/King KT 76A. ) Bendix/King KT 76C. %) Garmin GTX 327. %) Blind Altitude Encoder. One of the following blind altitude encoders can be installed in the DA 40: ) TCI Altitude Digitizer D120-P2-T. %) Sandia Aerospace Altitude Data System SAE5-35. ) Transponder antenna.
2. Description and Operation
A. Transponders, General
The transponder is a receiver/transmitter which operates at radar frequencies. It transmits transponder code and altitude data to the Air Traffic Control Radar Beacon System (ATCRBS).
The transponder replies to interrogation signals from the ATCRBS mode A secondary surveillance radar (SSR) at 1030 MHz. The reply signal at 1090 MHz gives the code which can be set on the cockpit display. A REPLY indication comes on when the equipment is transmitting.
The transponder can also give altitude data in reply to mode C interrogation. The transponder transmits data from the blind encoding altimeter to the ATCRBS.
The transponder has an ident button (IDENT or IDT). Push the ident button to transmit a special identification pulse. The ident pulse identifies the airplane to the air traffic controller.
Doc # 6.02.01 Page 1
Rev. 4 09 Jan 2003

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DA 40 Series
Navigation
AMM
AIRCRAFT
OIL PR L FUEL ALT
R FUEL VOLT
0

9 ACK1 START DOOR ISO PITOT IGN ALL
ON ELT ON RESET
28 ALT
160 IN.Hg
CALIBRATED
TO

40
28.7
AIRSPEED mb
20.000 FEET
140
7 BENDIX / KING KX 125 TSO
3
120 KNOTS
118.00T
0
108.00
60
64 S X
S
TO FR
OBS FLAGB
B
5 Y 136.97 0 15 117.95 Y
100 80
COMM NAV
AVIONICS
PULL
PULL
MODE
O BS
25K
ADF DME
PULL
PULL
OFF TEST IDENT
RPM
10
15 NAV/COM 2 AUDIO NAV/COM 1 GPS XPDR5
UPVERTICAL SPEED
3 10
100 FEET PER MINUTE 20
0 ENGINE & FUEL20
INST. 1AUTO MASTER AVIONICS
START IGNITION / ANNUNPILOT CONTROL MASTERINSTRUMENT
DOWN
5
ON 15
2 25 5 10 3
10
LIGHTING
OFF INST. STROBE POSITION TAXI/MAP LANDING FLOOD
FLOOD
5 3 55 5 3
ON SYSTEMS
FF
FUEL PITOT
PUMP ANNUN. FAN/OAT HEAT T & B DG HORIZONOFF
5 3 310
ELECTRICAL
28 VDC ESS. ALT. ALT.
ESS. ACC. BUSFLAPS BATT. PROT. CONTROL ALT.
PWR. GROUND
OPS. ONLY
5 5 5 7070 5
2A MAX
Mic.
Tank Display: max 16 US/gal
Tank Contents: max 20 US/gal
LIGHTS A/P AVIONIC FUEL ALT/BATPITOT LANDING TAXI POSITION STROBE MASTER MASTER PUMP
ON ALT
0400
SBY
max
OFF
TST IDENT
O
max
BENDIX / KING KT 76A
Reply Lamp
ON
0400
SBY
ALT
OFF TST

IDENT
BENDIX / KING KT 76A
Ident Button
Function Selector Channel Selector Knobs
Figure 1: Bendix/King KT 76A Transponder
Page 2 Doc # 6.02.01 09 Jan 2003 Rev. 4
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Navigation
AMM

B. Bendix/King KT 76A Transponder
Figure 1 shows the Bendix/King KT 76A transponder. It is located in the instrument panel at the % bottom, see Chapter 31.
The avionics bus or, if installed, the essential avionics bus supplies power to the transponder. The ALT/BAT switch and the AVIONICS MASTER switch must be set to ON to supply power through the XPDR circuit-breaker to the transponder. Refer to Chapter 92 for the wiring diagrams.
　
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