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Simultaneous Close Parallel Precision Runway Monitor (PRM) Approaches are independent approaches conducted to runways with centerline spacing of less than 4300 feet (1310m) but at least 3000' (915m). PRM is an acronym for the high update rate Precision Runway Monitor surveillance system which is required to monitor the No Transgression Zone (NTZ) for specific parallel runway separations used to conduct simultaneous close parallel approaches. PRM is published in the title as part of the approach name for Instrument Approach Procedures (IAP) used to conduct Simultaneous Close Parallel approaches. “PRM” also alerts pilots that specific airborne equipment, training, and procedures are applicable. Simultaneous Close Parallel PRM Approach (Source: FAA AIM): Note that aircraft will be separated laterally or vertically prior to the beginning of the NTZ and that the NTZ monitoring continues past the missed approach point (MAP) to ensure aircraft separation in the event of simultaneous missed approaches. Requirements S