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/2012030

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.eurocontrol.int/msa/gallery/content/public/documents/Doc9863_ACAS_Controller_Training_chp6_1.pdf 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.