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RADIO button – Used to access the ATC submenu on the MFD tuning window.
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FREQ – Used to position the focus indicator around the active ATC code when it is located within the TCAS/ATC block, but does not surround the active code.
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1/2 button – Enables cross-side control of the opposite ATC transponder.
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IDENT button – Used to select transponder ident for the active transponder.
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ATC button – Used to change the transponder/TCAS from standby to RA/TA, and from any state to standby.
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RADIO/DATA/ADV knob – Used to navigate through the displayed ATC submenu.
Cursor Control Panel . ATC Control Figure 17.10.60
ATC Transponder Control – TCAS/ATC Submenu
The combined TCAS/ATC 1 (2) control submenu is accessed using the RADIO ADV/DATA and RADIO button on the cursor control panel. Active mode selections on the submenu are indicated by enlarged cyan text.
From the submenu, the crew can carry out the following ATC functions:
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Set the ATC code.
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Identify the ATC altitude source (ADC 1 or ADC 2).
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Select the active ATC (1 or 2).
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Set the Flight ID.
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Select the TCAS/ATC mode.
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Enable the combined TCAS/ATC test.
NAVIGATION SYSTEMS Description Vol. 2 17.10.62
Oct 05/06
ATC Transponder Control
Figure 17.10.61
TRAFFIC ALERT AND COLLISION AVOIDANCE SYSTEM (TCAS)
Description
The TCAS is an airborne system that interrogates other aircraft’s ATC transponders to identify and display potential collision threats. The system protects a volume of airspace around the aircraft, and provides aural and visual advisories when intruding aircraft penetrate that protected airspace.
TCAS monitors a radius of approximately 5 to 40 NM around the aircraft. The TCAS transceiver transmits mode-C and mode-S transponder interrogation signals, and monitors all replies. Internal processing determines the range, bearing, and altitude of each transponder-equipped aircraft within range. When a conflict exists, the TCAS generates traffic advisory (intruder alert), resolution advisory (recommended vertical escape maneuver), and/or synthesized-voice audio outputs.
When an intruder aircraft is also equipped with a functioning mode-S transponder, the TCAS uses the transponder to transmit collision avoidance data to that aircraft. This mode-S link allows the two TCAS systems to coordinate conflict resolution between aircraft.
TCAS Transmitter/Receiver
The TCAS transmitter/receiver contains the TCAS computer, and is installed in the underfloor avionics compartment. It selectively transmits interrogation signals, receives and analyzes the responses, determines if potential conflicts exist, generates collision avoidance solutions, and formats the data to visually and/or aurally present that information to the pilots.
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