Definition
An automated air traffic control alert generated when the controller's radar system detects that the projected paths of two tracked aircraft will result in less than the required separation, or that an aircraft's projected path will conflict with terrain or an obstruction. The controller then issues advisories or instructions to resolve the conflict.
Plain English
A warning the controller's computer gives them when two aircraft, or an aircraft and the ground, look like they are going to get too close. The controller then steps in and tells the pilots what to do to stay safely apart.
Context Anchor
You may hear this on the radio from ATC, often with traffic information, suggested action, or both.
Derivation
Aircraft means a machine that flies. Conflict comes from a Latin word meaning “to strike together.” In aviation, it does not mean an argument; it means two aircraft are close enough that their paths could become unsafe. Alert means a warning that calls for attention now.
Why Pilots Care
Gives pilots and controllers time to change course or altitude before a dangerous situation develops.
Intuition Check
Do not hear “conflict” as a paperwork issue or disagreement. In this context, it means possible unsafe closeness between aircraft. Do not treat “alert” as casual information. It is a warning that needs immediate attention.
Example Sentence 1
An aircraft conflict alert prompted the controller to immediately turn the inbound traffic thirty degrees right to maintain separation.
Example Sentence 2
The crew responded to the aircraft conflict alert by climbing as directed by the controller.