Beechcraft C-12C Operator And Technical Reference Manual page 564

TM 1-1520-218-10
Figure 3C-152. TVI-920 Transponder/TCAS Mode/Warning Flags and Messages
Table 3C-110. TVI-920 Transponder/TCAS Mode/Warning Flags and Messages
SLOT NUMBER
1
1 & 2
3
3 & 4
4
4
5
6 & 7
7
7
3C-210
A/B
SYMBOL
6NM or 12NM Selected forward range of traffic display.
TCAS OFF TCAS set to standby, either manually or automatically.
TEST TCAS set to test mode.
No bearing Range and altitude of Resolution Advisories (RA) or Traffic
message (Red if Advisories (TA) intruders for which no bearing information is
RA; yellow if TA) available.
ABV Traffic displayed in altitudes from + 9900 ft to – 2700 ft, relative
to own aircraft. (If no message is displayed, traffic display is
from + 2700 ft to – 2700 ft relative to own aircraft.)
BLW Traffic displayed in altitudes from – 9900 ft to + 2700 ft, relative
to own aircraft. (If no message is displayed, traffic display is
from + 2700 ft to – 2700 ft relative to own aircraft.)
V/S Vertical speed is unreliable, or system is in test mode.
TCAS set to or operating in TA only mode.
ONLY T/A
message and box border change to yellow.
R/A Resolution advisory or vertical speed is unreliable (Red flag).
TCAS TCAS functions have failed (Yellow flag).
INTERPRETATION
If TA occurs,