What should radar service be limited to if radar mapping is unavailable?

In situations where radar mapping is unavailable, the focus should be on ensuring safe and effective traffic management without the full capabilities of radar services. The correct answer highlights that radar service should be limited to vectoring aircraft to intercept Precision Approach Radar (PAR) approaches. This is because PAR procedures are designed to provide precision guidance to aircraft as they approach for landing, which is essential for maintaining safety even in degraded radar conditions.

Although radar services can provide various levels of support, including issuing traffic calls and monitoring aircraft, the need for safety during critical phases of flight, such as landings, takes precedence. Vectoring aircraft directly to a PAR approach allows air traffic controllers to maintain a greater degree of control and safety, minimizing risks associated with limited radar information.

The other options do not address the specific needs of the situation adequately. For example, providing traffic calls only or monitoring without issuing vectors does not ensure that aircraft are being directed safely as they approach the runway, particularly in potentially unsafe conditions due to the lack of radar mapping.