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Precision Runway Monitor (PRM) System

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Definition

A system which provides air traffic controllers monitoring the No Transition Zone (NTZ) during simultaneous close parallel PRM approaches and simultaneous offset instrument appoaches with precision, high update rate secondary surveillance data. The high update rate surveillance sensor component of the PRM system is only required for specific runway or approach course separation. The high resolution color monitoring display, Final Monitor Aid (FMA) of the PRM system, or other FMA with the same capability, presents (NTZ) surveillance track data to controllers along with detailed maps depicting approaches and no transgression zone and is required for all simultaneous close parallel PRM NTZ monitoring operations.

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FAA