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display. Displayed data includes pressure altitude, flight time, count up timer, count down timer,
and may include contrast, and display brightness, depending on configuration.
) Code window. The transponder code, set by the code selection keys, is shown in the center of
the display.
) Reply indicator. The reply indicator blinks to indicate that the GTX 327 is functioning properly
and replying to interrogations.
) Mode annunciation. The mode annunciation indicates which mode is selected.
AIRCRAFT
DA 40 Series
AMM
Navigation
Doc # 6.02.01
Rev. 5 34-56-00 Page 7
20 Sep 2007
The transponder has these controls:
) Mode selection keys. The mode selection keys consist of:
) STBY. Sets the transponder to the standby mode. The transponder receives signals but
does not reply.
) ON. If the transponder receives an interrogation, it transmits the code set by the code
selection keys. You can set any code between 0000 and 7777.
) ALT. If the transponder receives an interrogation, it transmits the code set by the code
selection keys and altitude data from the blind encoder.
) OFF. Turns the unit off when depressed for approximately 2 seconds.
) IDENT key. Pressing the IDENT key activates the Special Position Identification (SPI) pulse for
18 seconds, identifying your transponder return from others on the air traffic controller's screen.
The word 'IDENT' will appear in the upper left corner of the display while the IDENT mode is
active.
) Code Selection Keys. Use these keys (0-7) to enter the transponder code.
) VFR button. Sets the transponder code to the pre-programmed VFR code selected in
configuration mode. Pressing the VFR button again will restore the previous identification code.
) FUNC button. Changes the page shown on the right side of the display. Displayed data includes
pressure altitude, flight time, count up timer, count down timer, and may include contrast, and
display brightness, depending on configuration.
) START/STOP button. Starts and stops the count up and count down timers.
) CRSR button. Initiates entry of the starting time for the count down timer and cancels
transponder code entry.
) CLR button. Resets the count up and count down timers and cancels the previous keypress
during code selection.
) 8 button. Reduces contrast and display brightness when the respective pages are displayed.
Also enters the number eight into the count down timer.
) 9 button. Increases contrast and display brightness when the respective pages are displayed.
Also enters the number nine into the count down timer.
AIRCRAFT
Navigation
DA 40 Series
AMM
Page 8
20 Sep 2007 34-56-00 Doc # 6.02.01
Rev. 5
Figure 4: D120-P2-T Blind Altitude Encoder Installation
AIRCRAFT
DA 40 Series
AMM
Navigation
Doc # 6.02.01
Rev. 5 34-56-00 Page 9
20 Sep 2007
E. TCI D120-P2-T Blind Altitude Encoder
Figure 4 shows the installation of the TCI D120-P2-T blind altitude encoder.
The TCI D120-P2-T blind altitude encoder is located on the instrument panel floor, on the left side.
The encoder connects to the static hose of the Pitot-static system. The encoder also connects to
the transponder for mode C operation.
You can calibrate the output of the encoder to align with the airplane altimeter indication.
Calibration potentiometers are next to the static port. Refer to the equipment manufacturer's manual
for more data about the encoder.
F. Sandia Aerospace Altitude Data System SAE5-35
The Sandia Aerospace Altitude Data System SAE5-35 is located on the instrument panel floor, on
% the left side, as shown in Figure 5 (Lycoming engine) and alternatively as shown in Figure 6 (TAE
% engine). The encoder connects to the transponder for mode C operation and to the one or two GPS
unit(s).
You can calibrate the output of the encoder to align with the airplane altimeter indication.
Calibration buttons are located inside the case on the opposite side of the electrical connectors
behind slot A and slot B. Refer to the equipment manufacturer's manual for more data about the
encoder.
G. Transponder Antenna
The Bendix/King KA 60 transponder antenna is located on the bottom surface of the fuselage,
under the cockpit on the left side.
AIRCRAFT
Navigation
DA 40 Series
AMM
Page 10
20 Sep 2007 34-56-00 Doc # 6.02.01
Rev. 5
% Figure 5: Sandia Aerospace Altitude Data System SAE5-35 Installation (Lycoming engine)
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% Figure 6: Sandia Aerospace Altitude Data System SAE5-35 Installation (TAE engine)
　
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