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Description
The TCAS is an airborne traffic surveillance system that provides collision avoidance alerts and
conflict resolution cues to pilots. Operating with the mode-S transponder, interrogations are
transmitted, responses from other similarly equipped aircraft are received and analyzed, potential
traffic threats are identified and displayed, and conflict resolutions are presented visually and
aurally.
TCAS is displayed on the flight displays in ranges of 5 to 40 NM around the aircraft. The typical
TCAS surveillance range is 30 NM. 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 and TCAS II, 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.
Components and Operation
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.
Power for the TCAS transmitter/receiver is supplied by the AC essential bus.
TCAS Antennae
The TCAS transmitter/receiver receives bearing information from the TCAS directional antenna
on the top of the fuselage, and receives altitude information from the TCAS omnidirectional
antenna, located on the underside of the fuselage.
TCAS Traffic Symbology
The TCAS computer classifies nearby aircraft into one of four types:
• Other traffic (OT)
• Proximate traffic (PT)
• Traffic alert (TA)
• Resolution advisory (RA)
NAVIGATION SYSTEMS
Description
Vol. 2 17−10−62
REV 76, Jul 17/09
CL−604 Operating Manual
PSP 604−6
TRAFFIC ALERT AND COLLISION AVOIDANCE SYSTEM (TCAS) (CONT'D)
TCAS MFD Traffic Symbology Display
Figure 17−10−56
NAVIGATION SYSTEMS
Description
Vol. 2 17−10−63
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
TRAFFIC ALERT AND COLLISION AVOIDANCE SYSTEM (TCAS) (CONT'D)
Other Traffic (OT)
Other traffic (OT) is non-threat traffic within the TCAS surveillance area. The display of OT
symbols on the MFD may be set to on or off. The control for this function is located on the RTU
TCAS main display page.
Other traffic is available for display in variable altitude volumes. The controls for this feature are
also located on the RTU TCAS main display page. “NORMAL” mode is the default mode.
“NORMAL” mode sets the OT window from between 2,700 feet above to 2,700 feet below own
airplane altitude. Selecting “BELOW” extends the lower portion of the OT window to 9,900 feet
below own airplane altitude. Selecting “ABOVE” extends the upper portion of the OT window to
9,900 feet above own airplane altitude.
Proximate Traffic (PT)
Proximate traffic are non-threat aircraft within ±1,200 feet relative altitude and six NM of own
aircraft. Proximate traffic cannot be deselected, and is always shown on the traffic display as an
aid to the pilots when visually acquiring TAs and RAs.
Traffic Alert (TA)
The TCAS computer issues traffic alerts, as appropriate, when TA/RA mode is active. TA/RA
mode is selected on the TCAS RTU main menu page. Traffic alerts are issued for non-threat
intruder aircraft that should be monitored because, depending upon their continued flight path,
they may become RA traffic. Traffic alerts are issues aurally and visually on the MFD, starting
20 to 48 seconds before the calculated closest point of approach. The audio message
“TRAFFIC, TRAFFIC” is annunciated over the aircraft audio system, and the message
“TRAFFIC” shows in yellow below the VSI on the PFD when the system is operating in TA
ONLY mode. “TA ONLY “ shows in yellow when the system detects TA traffic.
When the TCAS computer is operating in TA ONLY mode, RA traffic shows as TA traffic, and no
commanded vertical speeds show on the PFD. TA ONLY mode is selected via the RTU TCAS
main display page. “TA ONLY” shows in yellow when the system is operating in the TA ONLY
　
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