When should you stop talking to the controller on an ASR or PAR approach?

During an ASR (Airport Surveillance Radar) or PAR (Precision Approach Radar) approach, communication with the controller is primarily guided by their instructions. The correct choice emphasizes the importance of adhering to the controller's commands, which ensures the safety and efficiency of the approach.

Controllers provide critical information and guidance during instrument approaches, and they may instruct pilots to stop talking based on the phase of the approach and the traffic situation. For instance, if the controller needs to ensure that they can clearly communicate with other aircraft, or if there are concurrent operations, they may specifically direct pilots to cease communication. This minimizes the chances of miscommunication and enhances situational awareness for both the pilot and the controller.

The other choices suggest criteria for stopping communication based on personal judgment, readiness, or specific flight phases, which do not prioritize the controller's instructions. Each of those options could lead to confusion or missed instructions, thereby compromising the safety of the approach. Understanding that the controller's directives take precedence in communication protocols is essential.