What should a controller do before switching to record mode?

• A. Notify the pilots
• B. Check audio levels
• C. Ensure ON LINE is active
• D. Adjust surveillance settings

Answer: (C)

Before switching to record mode, a controller should ensure that ON LINE is active. This step is crucial because the ON LINE status indicates that the audio feed is currently operational, allowing the recording device to capture any communications accurately. If ON LINE is not active, switching to record mode will not effectively document the communications taking place, undermining the purpose of recording. This operational check is a standard protocol that helps maintain the integrity of communication records essential for safety, accountability, and training purposes in air traffic control.

While notifying pilots, checking audio levels, and adjusting surveillance settings are all important aspects of an air traffic controller's responsibilities, they do not specifically precede the action of switching to record mode. Ensuring ON LINE is active directly correlates to the effectiveness of the recording process, making it the most relevant step in this context.