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) VFR button. Momentarily pressing the VFR button will enter a pre-programmed VFR code, typically 7000, in the code window. Pressing and holding the VFR button for two seconds will cause the last active code to be displayed.
% D. Garmin GTX 327 Transponder
% Figure 3 shows the Garmin GTX 327 transponder. It is located in the instrument panel on the right % side 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 (Lycoming version) or ELECTRIC MASTER key switch (TAE version) and the % AVIONIC MASTER switch must be set to ON to supply power through the XPDR circuit-breaker % to the transponder.
% The transponder has a display which shows the following:
%) FUNC window. The FUNC button changes the FUNC window 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.
%) 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.
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% 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.

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% Figure 4: D120-P2-T Blind Altitude Encoder Installation
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% E. TCI D120-P2-T Blind Altitude Encoder
% Figure 4 shows the installation of the TCI D120-P2-T blind altitude encoder.
　
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