Pilot/Controller Glossary
AUTOMATED TERMINAL PROXIMITY ALERT (ATPA)
This reproduces published FAA reference text for study. It does not replace the current official FAA publication or regulation.
Monitors the separation of aircraft on the Final Approach Course (FAC), displaying a graphical notification (cone and/or mileage) when a potential loss of separation is detected. The warning cone (Yellow) will display at 45 seconds and the alert cone (Red) will display at 24 seconds prior to predicted loss of separation. Current distance between two aircraft on final will be displayed in line 3 of the full data block of the trailing aircraft in corresponding colors.
Retrieved from ecfr.gov on July 18, 2026.