The PRM system is primarily used to monitor precision approaches on what scenario?

• A. En route navigation.
• B. Precision approaches on parallel runways.
• C. Weather radar data collection.
• D. Taxiway operations.

Answer: (B)

When two aircraft are performing precision approaches to parallel runways, keeping clear separation between them in the terminal area is challenging. The Precision Runway Monitoring system provides enhanced surveillance focused on those simultaneous precision approaches, giving the controller near real-time, high-precision position information for both aircraft on final. This allows the controller to maintain the required lateral and vertical separation and to detect potential conflicts early, improving safety and efficiency during parallel-approach operations. It isn’t used for en route navigation, weather radar data collection, or taxiway operations.