A display indication given to the pilot by the Traffic Alert and Collision Avoidance System (TCAS II) recommending a maneuver to increase vertical separation relative to an intruding aircraft. Positive, negative, and vertical speed limit (VSL) advisories constitute the resolution advisories. A resolution advisory is also classified as corrective or preventive.

Source FAA Pilot/Controller Glossary↗ · checked 2026-08-25