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190-01004-03 Rev. P
GTN 625/635/650 Pilot’s Guide
Traffic
Symbol
Description
Other Non-threat Traffic
Proximity Advisory
Traffic Advisory (TA)
Off-scale Traffic Advisory
Resolution Advisory (RA)
Off-scale Resolution Advisory
Table 9-18 TCAS II Traffic Symbol Description
9.9.2
TCAS II with ADS-B
When the GTS 8000 TCAS II is in operating mode, it interrogates Mode-S
transponder data while automatically receiving ADS-B position and velocity
information directly from a comparably equipped aircraft target. The system
attempts to match (or “correlate”) the two surveillance data sources to increase
the preciseness of its target location. When a correlation is made, the system
displays the traffic information for the source determined to be the most
accurate. Any traffic that is not correlated (i.e., only detected by one system but
not the other) is also displayed for the flight crew. This may occur, for example,
if another aircraft is beyond the surveillance range of the TCAS II, but the
GTS 8000 is still receiving position and velocity information from other ADS-B
equipped aircraft. The traffic correlation feature improves the accuracy of the
traffic displayed, while reducing the occurrence of displaying a single target
twice.
NOTE: Aircraft that are surveilled by ADS-B In only will not trigger a TCAS
resolution advisory.
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