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The TCAS system provides no indication of traffic conflicts if the intruder aircraft is without
an operative transponder.
TCAS provides symbology that depicts surrounding airplanes in terms of relative altitude,
range, clock position, and vertical rate. The flight compartment displays also provide data
on closure rates. The system displays four types of traffic.
Traffic Collision Avoidance System --- Threat Level and Data Tags
Figure 18---70---1
TCAS DISPLAY THREAT LEVELS AND DATA TAGS
THREAT LEVEL
DEFINITION
Intruding aircraft 25
seconds from closest
point of approach
Intruding aircraft 40
seconds from closest
point of approach
Any traffic within TCAS
range limit
+00
THREAT
SYMBOL COLOR LEVEL CAUSE
Resolution
Advisory (RA)
Traffic
Advisory (TA)
Proximate
Traffic
Other Traffic
Intruding aircraft is above by
100 feet and descending at
least 500 feet per minute
Traffic below 1,200 feet and
climbing at least 500 feet
per minute
Intruding aircraft level
with and not climbing or
descending
RED
AMBER
CYAN
CYAN Traffic above 2,700 feet and
descending at least 500 feet
per minute
+01
--12
+27
The display control panels are used to activate TCAS and to set range display. Weather
radar data can be overlaid on the multifunctional display, in TCAS mode.
TCAS mode and altitude format are displayed on the top level page of the radio tuning units
and can also be overlaid on any map display. Testing and setting changes are made on the
TCAS main page.
NAVIGATION SYSTEMS Vol. 1 18--70--2
Traffic Alert and Collision Avoidance
System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
Traffic Colision Avoidance System Interface
Figure 18---70---2
PSEU
EGPWS
RAD ALT 1/2
EICAS
(FDR)
AECU
IAPS
(MDC)
TA/RA TA/RA
AIR/GROUND
LOGIC
AURAL
PRIORITY
TA ONLY
AURAL
WARNINGS
TA/RA
COORDINATION
& CONTROL
MODE S
XPNDR
ATC 2
ADC 1
ADC 2
ALT ALT
TCAS
RTU 2
BRT
RTU 1
MODE S
XPNDR
ATC 1
BRT
BRT
DIR
ANT
OMNI
ANT
28 VDC
ESS BUS
CB1--V10
TCAS
IRS 2 HDG
NAVIGATION SYSTEMS Vol. 1 18--70--3
Traffic Alert and Collision Avoidance
System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
Traffic Collision Avoidance System --- Controls <2040>
Figure 18---70---3
TFC (TCAS)
Used to directly select TCAS
traffic display on MFD.
RANGE -- Inner Selector
Used to select range displayed
on MFD. Range selections are:
5, 10, 20 and 40 NM.
Display Control Panel
Pilot’s and Copilot’s Side Panels
BRG FORMAT RANGE
RDR / TERR TFC
SOURCE
NAV
NAVIGATION SYSTEMS Vol. 1 18--70--4
Traffic Alert and Collision Avoidance
System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
Traffic Collision Avoidance System --- Radio Tuning Unit
Figure 18---70---4
Radio Tuning Unit -- Top Level Page
Center Pedestal
TCAS Mode (cyan)
Displays the selected TCAS mode.
Altitude Format (cyan)
Displays the selected altitude format.
(relative or absolute)
Radio Tuning Unit -- TCAS Main Page
Center Pedestal
Mode Selection
Used to select TCAS mode. Selected mode is displayed in cyan.
AUTO -- All advisories are displayed.
STBY -- All interrogations are inhibited.
TA ONLY -- Only traffic advisories are displayed.
Altitude Format
Used to select altitude format.
REL -- Relative to own airplane altitude.
ABS -- Absolute with respect to barometric altitude.
TCAS Key
Used to select TCAS main page.
Traffic Selection
Used to select traffic display
mode. Selected setting is
displayed in cyan.
ON -- Displays all
transponder traffic
(advisory, proximate and
others).
OFF -- Displays advisory
traffic only.
Altitude Range
Used to select surveillance
airspace relative to own air
plane altitude. Selected
setting is displayed in cyan.
ABOVE -- 9,900 feet above
and 2,700 feet below.
NORM -- 2,700 feet above
and below.
BELOW -- 2,700 feet above
and 9,900 feet below.
NAVIGATION SYSTEMS Vol. 1 18--70--5
Traffic Alert and Collision Avoidance
System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
　
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