Embraer EMB145 - Page 2269

AIRPLANE
OPERATIONS
MANUAL
NAVIGATION AND
COMMUNICATION
REVISION 31
2-18-11
Page
11
Code
01
TRANSPONDER AND TCAS OPERATION
Transponder operation is similar to other radio equipment since it
requires moving the yellow cursor box to a desired function. In order to
tune a desired ATC code, press the Line Select beside the ATC code
display. This action will enable the Frequency Tuning Knobs to change
the ATC codes. The outer knob sets the thousands and hundreds
digits and the inner knob sets the tens and ones digits.
Pressing and holding the code Line Select Button will recall the stored
preset code (typically used for VFR). A new code may be stored by
setting the code and then pressing the Memory Storage Button on the
RMU Bezel Panel.
Pressing the Line Select Button associated with the transponder
operating mode display will move the yellow cursor box to surround the
mode annunciation in the ATC/TCAS window allowing to set a new
transponder mode if a non-standby mode is selected. Once the mode
annunciation is surrounded, pressing the Transfer Button 1/2 will select
which transponder will be in operation (e.g., 1 ATC ON to 2 ATC ON).
The transponder operational modes are the following:
− ATC ON - Replies on Modes S and A, no altitude reporting.
− ATC ALT - Replies on Modes A, C and S, with altitude reporting.
− TA ONLY - TCAS Advisory Mode is selected.
− TA/RA - TCAS Traffic Advisory/Resolution Advisory Mode is selected.
RMU ABNORMAL OPERATION
Loss of the Primary Radio Bus will disable the cross-side control
capability and also the TBCH. However, no radio functions will be lost.
The radios on both sides will still be functional through the Secondary
Radio Buses.
Loss of the left and/or right Secondary Radio Bus will not disable the
radio functions. The radios may be tuned, in this condition, through the
Primary Radio Bus or through the cross-side control feature.
As a safety feature of the RMU, if any component of the Radio System
fails to respond to the commands from the RMU, the frequencies or
the operating commands associated with that particular function will be
removed from the RMU display and replaced with dashes.