Which action involves switching to a backup sensor system to maintain radar coverage?

• A. Activate contingency procedures
• B. Inform ATC and operations
• C. Implement approved alt routing
• D. Switch to backup sensors

Answer: (D)

When radar coverage must be preserved, the direct action is to switch to backup sensors. This uses an alternate sensor system so surveillance data continues without gaps, keeping tracking and detection intact even if the primary radar goes down or degrades. Backup sensors are part of the system’s redundancy, designed exactly for this scenario, and can be activated automatically or manually depending on the setup.

Other steps are important parts of the response, but they don’t by themselves maintain radar coverage. Activating contingency procedures covers the broader plan, informing ATC and operations handles communication and coordination, and implementing approved alternate routing changes how traffic is directed in response to degraded coverage. The key action that maintains the radar picture is switching to the backup sensors.