How many aircraft can the Precision Approach Radar (PAR) track at once?

The Precision Approach Radar (PAR) system is designed specifically for tracking multiple aircraft during approach and landing phases. The correct answer reflects the operational capacity of PAR, which is typically able to track a maximum of six aircraft simultaneously. This limitation is based on the system's configurations and processing capabilities, which allow it to manage and provide guidance effectively to aircraft within a specified airspace.

In a busy airspace, it is crucial to maintain accurate tracking and situational awareness to ensure safety. Hence, while the radar can maintain a situational awareness generally for many more aircraft, providing precise data and guidance is limited to six identified targets at any given time. This ensures that the air traffic controllers have accurate information for effective management and guidance of aircraft during landing procedures.