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I believe that’s how TCAS (Traffic Collision Avoidance System) works; ADS-B broadcasts aircraft data which is received by other aircraft, and an “advisory” is i

I believe that’s how TCAS (Traffic Collision Avoidance System) works; ADS-B broadcasts aircraft data which is received by other aircraft, and an “advisory” is issued to the crew if a potential for collision is detected. This system operated in this case, for the lower aircraft of the two.

cjbprime 7y ago
I think the parent commenter is pointing out that the descending aircraft could (and arguably should) have refused the descent clearance on noticing that it would lower them into FL290 traffic that they could see via ADS-B display in the cockpit, long before TCAS fired.