Final answer:
Yes, during a PAR approach it is true that the aircraft should be informed of its position at least once before starting the final approach. This ensures the pilot is aware of the aircraft's position relative to the glide path and localizer before commencing the final descent.
Step-by-step explanation:
The statement that during a PAR approach, inform the aircraft of its position at least once before starting the final approach is true. Precision Approach Radar (PAR) is a type of approach where a controller provides navigation guidance in azimuth and elevation to an aircraft, thus assisting with the safe descent during approach and landing. It is a procedure usually applied when the visibility is poor, such as during bad weather conditions or at night. The guidance is crucial for pilots to establish and maintain the appropriate glide path and alignment with the runway centerline.
The controller's responsibility includes giving accurate and frequent position updates to ensure that the aircraft maintains the proper flight path. Before the final approach, the aircraft's position with respect to the glide slope and localizer is given to the pilot to prepare for the final descent. This step is critical to allow the pilot to make adjustments if necessary and is a standard operating procedure for PAR approaches. Following this, the aircraft will receive continuous updates to guide it down to the runway threshold.