The Traffic Alert and Collision Avoidance System (TCAS) was developed in order to reduce the risk of mid-air collisions between aircraft. It serves as a last-resort safety net irrespective of any separation standards. ACAS equipment provides two types of advisories to pilots: Resolution Advisories (RAs) and Traffic Advisories (TAs).
- TA is an actual warning received by the pilot. It gives indication to the flight crew that a certain intruder is a potential threat.
- RA is an indication to the pilot that a manoeuvre is necessary to provide separation from all threats or there is a need to restrict a manoeuvre and so maintain existing separation.
Note that TAs enhance situational awareness and assist visual acquisition of conflicting traffic. But the visual acquired traffic may differ from the traffic causing a TA.
Your Notes (not visible to others)