Symbols. Symbols displayed on TCAS display are
shown in Table 3C-109.
d. TCAS Mode/Warning Flags and Messages.
TCAS mode/warning flags and messages are shown
in Figure 3C-152 and Table 3C-110. They may
appear in one of the seven indicated slots on the
e. Aural Annunciator Messages. There are
two types of aural annunciator messages: a traffic
advisory annunciation and a resolution advisory
annunciation. The annunciator messages are
described in Table 3C-111.
Table 3C-109. TVI-920 Transponder/TCAS Display Symbols
VERTICAL SPEED DISPLAY
Vertical Speed Scale
100-ft index marks from 0 to ± 1000 fpm and 500-foot index marks from ± 1000
to ± 6000 fpm are always displayed.
Indicates present vertical speed. Pointer displayed when vertical speed is valid.
VERT SPEED X 1000
Legend displayed on indicator when operating in the transponder only mode and
in some failure modes.
Do not enter range if vertical speed is outside of arc (preventive resolution); exit
range if vertical speed is within arc (corrective resolution).
Recommended vertical speed to resolve corrective resolution advisory.
"Own aircraft" symbol displayed continuously.
Range Ring (White)
Two-mile radius range about aircraft. If no bearing message is displayed only
the forward half of ring will be displayed.
Solid Square (Red)
Threat-level intruder; RA generated; range and bearing relative to own aircraft.
Solid Circle (Yellow)
Potential threat-level intruder; TA generated; range and bearing relative to own
Solid Diamond (Cyan)
Proximate traffic within ± 1200 ft and 6 nm of own aircraft.
Open Diamond (Cyan)
Other traffic; beyond 6 nm and/or greater than ± 1200 ft from own aircraft.
Relative or absolute (flight level) altitude of intruder. If altitude is not available,
data tag is not displayed.
Vert speed trend arrow
Arrow indicating direction of vertical speed change (>500 fpm) of intruder.
(Same color as fully
Off scale or out of range RA or TA intruder; symbol at periphery of display at
bearing to intruder.