Use of Airborne Collision Avoidance System II (ACAS II)
41.—(1)  When ACAS II is installed in an aircraft mentioned in regulation 3(1)(a) or (b), the pilot‑in‑command must ensure that ACAS II is used during flight in a mode that enables Resolution Advisories (RAs) to be produced unless the use of ACAS II in that mode is not appropriate for conditions existing at the time.
(2)  When ACAS II produces an RA, the pilot flying the aircraft mentioned in paragraph (1) must immediately take the corrective action indicated by the RA, even if the action conflicts with an instruction from the appropriate air traffic control unit.
(3)  The pilot flying an aircraft mentioned in paragraph (1) must use appropriate procedures to ensure that a rate of climb or descent not exceeding 8 m/sec (1,500 ft/min) is achieved throughout the last 300 m (1,000 ft) of climb or descent to the assigned altitude or flight level unless the appropriate air traffic control unit instructs otherwise.
(4)  Nothing in this regulation prohibits the pilot-in-command of an aircraft mentioned in paragraph (1) from exercising the pilot‑in‑command’s judgment and full authority in the choice of action to resolve a traffic conflict or avert a potential collision.