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For Training Purposes Only
May 03
17-77
P I LOT T R A I N I N G GU I D E
Transponder Controls (Reversionary / Inhibit Panel)
Figure 17-54
ATC SEL
Selects No. 1 or No. 2
ATC Transponder
P604_17_038
INHIBIT PUSH
1-RTU-2 FMS TUNE
1 2
AFCS
SEL
STBY
1 2
ATC
SEL
FMS
TUNE
INHIB
RTU 1
INHIB
RTU 2
INHIB
NAVIGATION SYSTEMS
17-78 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
Traffic Alert and Collision Avoidance System (TCAS)
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 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.
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.
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.
Power for the TCAS transmitter / receiver is supplied by the AC Essential Bus.
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
For Training Purposes Only
May 03
17-79
P I LOT T R A I N I N G GU I D E
TCAS MFD Traffic Symbology Display
Figure 17-55
BRT
T+10.7
250 SAT 12C
10
LX/WX+TRB
TAS 254
USTB
UTC11:42 GS TAT-15C
FMS2
YUL
G+3
+10
+01
RA 2. / 00
TA 4. / -03
0NM
0NM
ABOVE
BELOW
ALT
180
-OFF
-02
+07
- 45
RA Traffic
TA Traffic
Proximate Traffic
Other Traffic
Intruder
Symbol
ALT Data
(REL/ABS Altitude
x 100 feet)
VS Arrow
(if VS > 500 fpm)
Traffic Detail: The following TCAS messages may display on the
MFD screens:
The following TCAS messages may display on the PFD
screens:
Message
Message
Meaning
Meaning
TCAS FAIL
TCAS TEST
TD FAIL
TRAFFIC
RA FAIL
TCAS FAIL
TCAS OFF
TCAS TEST
TCAS system failure (amber)
TCAS computer is in test mode (white)
TCAS data not received (amber)
RA (red) or TA (amber) intruder detected
TCAS data not received (amber)
TCAS system failure (amber)
TCAS system is off (white)
TCAS computer is in test mode (white)
TCAS TRAFFIC MAP FORMAT
TCAS
Mode
Display
TCAS
Altitude
Display
Traffic Symbol
Range
Distance
Range
Rings
Aircraft
Symbol
No Bearing
Advisory
Window
Example:
RA traffic alert –
intruder at 10:30; 4
miles away, 700 feet
above, descending
greater than 500 fpm
Azimuth Tick
Marks
P604_17_043
Intruder Symbology:
NAVIGATION SYSTEMS
17-80 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
Other Traffic (OT)
Other Traffic (OT) is non-threat traffic within the TCAS surveillance area. The display
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