Garmin GTS 820 TAS Pilot's Manual page 27

6.4.1.2 TA Criteria
Targets may become a TA based on closure rate (time until collision) or if they
encroach within a minimum distance. The criteria used depend on the current
sensitivity level and whether the target has altitude reporting capability. Once a
TA is generated, it will remain a TA for at least 8 seconds, even if the target no
longer satisfies the criteria for a TA. Table 4 summarizes the criteria used for TAs.
Sensitivity Intruder Altitude
Level
A
A
B
B
190-00587-02 Rev. E
Available
Intruder closing rate provides less than 20
seconds of vertical and horizontal separation.
Or:
Intruder closing rate provides less than 20
Yes seconds of horizontal separation and vertical
separation is within 600 feet.
Or:
Intruder range is within 0.2 NM and vertical
separation is within 600 feet.
Intruder closing rate provides less than 15
No seconds of separation or intruder range is
within 0.2 NM.
Intruder closing rate provides less than 30
seconds of vertical and horizontal separation.
Or:
Intruder closing rate provides less than 30
Yes seconds of horizontal separation and vertical
separation is within 800 feet.
Or:
Intruder range is within 0.55 NM and vertical
separation is within 800 feet.
Intruder closing rate provides less than 20
No seconds of separation or intruder range is
within 0.55 NM.
Table 4 TA Alerting Criteria
Garmin GTS Traffic Systems
TA Alerting Conditions
21