Definition
An air traffic control software function that continuously analyzes flight data, surveillance returns, and flight plans to identify potential conflicts or operational problems — such as aircraft-to-aircraft conflicts, aircraft-to-airspace incursions, and route or altitude deviations — and alerts the controller before the situation becomes critical.
Plain English
A computer tool that watches flight data in the background and warns the controller early if two aircraft, or an aircraft and a piece of airspace, look like they may end up in conflict.
Context Anchor
Seen in FAA material about air traffic control automation and controller tools, not as equipment the pilot operates in the aircraft.
Why Pilots Care
It supports proactive safety by giving controllers time to resolve traffic conflicts before they develop into incidents.
Intuition Check
APD does not mean the aircraft automatically fixes a problem. It means an FAA computer system detects a possible problem and alerts the controller.
Example Sentence 1
Automated Problem Detection alerted the controller that the climbing traffic would lose separation with an aircraft already at 11,000 feet.
Example Sentence 2
Modern airspace systems incorporate APD to reduce controller workload during high traffic periods.