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AIM 

6/17/21 

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16.  Simultaneous Close Parallel PRM Approaches and Simultaneous Offset Instrument 

Approaches (SOIA) 

FIG 5

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PRM Approaches 

Simultaneous Close Parallel 

a.  System. 

1. 

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 ap-
proaches. PRM is also published in the title as part of 
the approach name for IAPs used to conduct 
Simultaneous Close Parallel approaches. “PRM” 
alerts pilots that specific airborne equipment, 
training, and procedures are applicable. 

Because Simultaneous Close Parallel PRM ap-
proaches are independent, the NTZ and normal 
operating zone (NOZ) airspace between the final ap-
proach courses is monitored by two monitor 
controllers, one for each approach course. The NTZ 
monitoring system (final monitor aid) consists of a 
high resolution ATC radar display with automated 
tracking software which provides monitor controllers 
with aircraft identification, position, speed, and a 

ten

second projected position, as well as visual and 

aural NTZ penetration alerts. A PRM high update rate 
surveillance sensor is a component of this system on-
ly for specific runway spacing. Additional 
procedures for simultaneous independent approaches 
are described in Paragraph 5

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15, Simultaneous 

Independent ILS/RNAV/GLS Approaches. 

2. 

Simultaneous Close Parallel PRM approach-

es, whether conducted utilizing a high update rate 
PRM surveillance sensor or not, must meet all of the 
following requirements: pilot training,PRM in the 
approach title,NTZ monitoring utilizing a final 
monitor aid, radar display, publication of an AAUP, 
and use of a secondary PRM communications 
frequency. PRM approaches are depicted on a 
separate IAP titled (Procedure type) PRM Rwy XXX 
(Simultaneous Close Parallel or Close Parallel). 

NOTE

 

ATC does not use the word “independent” when 
advertising these operations on the ATIS. 

Arrival Procedures 

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