% 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.
Doc # 6.02.01 Page 7
Rev. 4 09 Jan 2003
34-56-00
AMM
AIRCRAFT
% Figure 4: D120-P2-T Blind Altitude Encoder Installation
Page 8 Doc # 6.02.01 09 Jan 2003 Rev. 4
34-56-00
Navigation
AMM
% 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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