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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.
AIRCRAFT
Navigation
DA 40 Series
AMM
Page 2
20 Sep 2007 34-56-00 Doc # 6.02.01
Rev. 5
0 4 0 0
IDENT
OFF TST
SBY ALT
ON
BENDIX / KING KT 76A
Channel Selector Knobs
Reply Lamp
Function Selector
Ident Button
4
IN .Hg
1
7
6 5
20.000 FEET
ALT
mb CALIBRATED
8
TO
9
0
3
28.7
2
20
20
15
UP
5
10
VE RT IC AL S PE ED
100 FE ET P ER M INUTE
15
10
DOWN
5
0
100
80
KNOTS 60
AIRSPEED
160
40
140
120
RPM
S
BY
S
BY
COMM
OFF
PU LL
TES T
PU LL
ID EN T
PULL
25K
MODE
PULL
OBS
BENDI X / KING KX 125 TSO
NAV
118.00 0 108.00
136.97 OBS 0 15 FLAG 117.95
T
X
TO
FR
OFF R
L
BOTH START
P ITOT LANDI NG TA XI POSI TION S TROBE
LIGHTS A /P
MA ST ER
AV ION IC
MAST ER
FU E L
P UMP
ALT/BAT
0 4 0 0
IDENT
OFF TST
SBY ALT
ON
BENDIX / KING KT 76A
AC K
ON E LT ON RE S ET
Tank Display: max 16 US/gal
Tank Contents: max 20 US/gal
max
max
3 10
2 25 5 10 3
5 3 5 5 5 3
5
5
3 10
5 5
3
70 70 5
ANNUN. FAN/ OAT
PITOT
HEAT
FUEL
PUMP
FLAPS BATT.
ESS. ALT. ALT.
PROT. CONTROL
T & B DG HORI ZON
ALT.
ESS.
28 VDC
ACC.
BUS PWR.
INST. STROBE POSITION TAXI/MAP LANDING FLOOD
MASTER AVIONICS
CONTROL MASTER
AUTO
PILOT
GPS
IGNI TION
INST. 1
/
ANNUN
START
NAV/COM 2 AUDIO NAV/COM 1 XPDR
ADF DME
ENGINE & FUEL
AVIONICS
LIGHTING
SYSTEMS
ELECTRICAL
OPS.
GROUND
ONLY
2A MAX
ISO
ALL
Mic.
F F
INS TRU ME NT
FLOOD
ON
OFF
ON
OFF
OIL PR L FUEL
R FUEL
ALT
VOLT
START
PITOT
DOOR
IGN
Figure 1: Bendix/King KT 76A Transponder
AIRCRAFT
DA 40 Series
AMM
Navigation
Doc # 6.02.01
Rev. 5 34-56-00 Page 3
20 Sep 2007
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.
Turn the function selector switch clockwise from the OFF position to set the transponder on. There
is a 45 second delay after setting the unit ON from OFF to let the transmitter tube warm-up. The
function selector switch has these positions:
) SBY Sets the transponder to the standby position. The transponder receives signals but does
not transmit.
) ON If the transponder receives a mode A interrogation, it transmits the mode A code set by
　
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