What Is TCAS? A Comprehensive Guide to Traffic Collision Avoidance Systems
Pilot Institute
JULY 4, 2025
The areas marked red on the VSI show climb or descent rates that can put you on a collision course. Green markings show the climb or safe climb, or descent rates. You can even find it as an optional system in small general aviation aircraft. TCAS RAs can only tell you to climb or descend. This is by design. All other U.S.-registered
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