User's Manual

SYSTEM DESCRIPTION AND INSTALLATION MANUAL
TCAS 3000 Traffic Alert and Collision Avoidance System
34−43−23
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Page 1−53
15 Dec 2005
B. Display Symbology
The TCAS modes use color−coded symbols and data tags to map air traffic and locate
threat aircraft on the VSI/TRA display.
Four traffic symbols are used: solid circle, solid square, solid diamond, and hollow
diamond. See Figure 1−18 for examples. A different color is assigned to each symbol
type, as listed in Table 1−13.
Table 1−13. TCAS Traffic Symbols
Graphic Symbol Color Display Function
Solid Circle Amber Traffic Advisory (TA)
Solid Square Red Resolution Advisory (RA)
Solid Diamond Blue Proximate Traffic
Hollow Diamond Blue Other Traffic
NOTE: TCAS traffic information displayed on EFIS displays such as crew alerting
system display, navigation display, electronic horizontal situation display or
multifunction display, is similar to that on combined VSI/TRA indicators. Traffic
symbology is identical to that displayed on the VSI/TRA.
(1) Colors
(a) Amber
Represents a moderate threat to a TCAS−equipped aircraft. A visual search is
recommended to prepare for intruder avoidance. Amber is used only in
conjunction with a traffic advisory.
(b) Red
Represents an immediate threat to a TCAS−equipped aircraft. Prompt action is
required to avoid the intruder. This color is only used in conjunction with a
resolution advisory.
(c) Blue
Represents proximate traffic and other traffic the TCAS surveillance logic has in
its track file.
(d) White
Used only for mode annunciations and for reference graphics, including aircraft
home position, range ring, and VSI scale.