User Manual

Table Of Contents
operation 523-0809018
Table 3-5. Transponder Page, RTU Radio Tuning Unit or Control Display Unit. - Continued
CONTROL OR DISPLAY FUNCTION / DESCRIPTION
ATC P a g e ( RTU or C D U )
NOTE
Identical control selections are presented on both RTUs (or on both CDUs) for the ATC
transponder so that either pilot can make transponder control selections.
To access the ATC Transponder main display page from the RTU or CDU top level page, push
the ATC line select key two times. The rst push positions the tune window around the ATC
code, and the s econd push shows the ATC main display page.
ACTIVE ATC BEACON
CODE ANNUNCIATOR
To enter the ATC Ident code from the TUNE page or ATC CONTROL page, enter the desired
code in the scratchpad.
The condition s that follow dene a valid beacon code ent ry:
One t o four digits have been entered (i.e., 1 = 0001).
Each digit entered is between 0 and 7 (i.e., 2753, 7367, 377, etc.).
IDENT ANNUNCIATOR Push the IDENT ANNUNCIATOR ident line key to transfer the contents of the scratchpad to
the ATC eldonaCDU.
ALTITUDE REPORTING
MODE
The ALTITUDE REPORTING MODE is set from the ATC main display page. The line select
key adjacent to the ALT legend is used to select altitude reporting m ode (push-on/push-off).
NOTE
TCAS operation requires altitude data, s o if the ATC transponder is not set to ALT re-
porting mode, the TCAS system automatically selects STBY mode.
REPORTING ALTITUDE
ANNUNCIATOR
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