The Traffic Collision Avoidance System (TCAS) interrogates the transponders of nearby aircraft to track their altitude and trajectory. If it predicts a collision risk, it issues a Traffic Advisory to alert the crew. If the threat worsens, it issues a Resolution Advisory, giving pilots direct voice commands to climb or descend to avoid the other plane.
Heard on the job
TCAS just commanded a climb, tell approach we're responding to an RA.
Also heard as
- Traffic Collision Avoidance System
- ACAS