[gdmt]

FYI I think the pilots are required to respond to the TCAS RA.

[hkwerf]

They generally are. For reference, here's what eurocontrol's controllers have to expect a pilot to do when issued a TCAS RA: https://web.archive.org/web/20120305182903/http://www.euroco...

> 6.3.1.5 When an RA is issued, pilots are expected to respond immediately to the RA unless doing so would jeopardize the safe operation of the flight. This means that aircraft will at times manoeuvre contrary to ATC instructions or disregard ATC instructions.