TA Alerting Conditions
The traffic system automatically adjusts its TA sensitivity level to reduce the likelihood of nuisance TA alerting during flight phases likely to be near airports. The system uses Level A (less) sensitivity when the height above terrain is at or below 2,000’ AGL. If the height above terrain is unavailable, Level A sensitivity applies when the ground speed is less than 120 knots. In all other conditions, Level B (higher) sensitivity applies.
|
Sensitivity Level |
Intruder Altitude Available |
TA Alerting Conditions |
|---|---|---|
|
A |
Yes |
Intruder closing rate provides less than 20 seconds of vertical and horizontal separation. Or: Intruder closing rate provides less than 20 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. |
|
A |
No |
Intruder closing rate provides less than 15 seconds of separation. Or: Intruder range is within 0.2 NM. |
|
B |
Yes |
Intruder closing rate provides less than 30 seconds of vertical and horizontal separation. Or: Intruder closing rate provides less than 30 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. |
|
B |
No |
Intruder closing rate provides less than 20 seconds of separation. Or: Intruder range is within 0.55 NM. |