Aeronautical Information Manual (AIM), page 378

Index   377 -- Page 378 -- 379

5-4-16. Simultaneous Close Parallel ILS PRM/RNAV PRM/GLS PRM Approaches and
Simultaneous Offset Instrument Approaches (SOIA)
(See FIG 5-4-22.)

FIG 5-4-22
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 approaches. 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 ap-


Because Simultaneous Close Parallel PRM
approaches are independent, the NTZ and normal op-
erating zone (NOZ) airspace between the final
approach courses is monitored by two monitor con-
trollers, one for each approach course. The NTZ
monitoring system consists of high resolution ATC
radar displays, automated tracking software which

provides monitor controllers with aircraft identifica-
tion, 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 only for specific runway

spacing. Additional procedures for simultaneous in-

dependent approaches are described in Paragraph

5-4-15, Simultaneous (Parallel) Independent ILS/

RNAV/GLS Approaches. Simultaneous Close

Parallel PRM approaches, whether conducted utiliz-

ing 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, publication on an AAUP,
and use of a secondary PRM communication fre-

Simultaneous close parallel ILS PRM approaches are
depicted on a separate Approach Procedure Chart

5-4-42 Arrival Procedures

Page 378 of the Aeronautical Information Manual (AIM.pdf)
AIM: Official Guide to Basic Flight Information and ATC Procedures

Index   377 -- Page 378 -- 379