Simultaneous Independent Approach is a system permitting simultaneous ILS/RNAV/GLS approaches to parallel runways with centerlines separated by 4,300 to 9,000 feet utilising No Transgression Zone (NTZ) final monitor controllers. The three classes of parallel approaches are depicted in the diagram below with more detailed descriptions following.ĭiagonal Separation (Source: FAA AIM) Simultaneous (Parallel) Independent Approaches Pilots should follow recommended TCAS operating procedures in the event of a Resolution Advisory (RA).
Traffic Collision Avoidance Systems (TCAS) provide an additional element of safety to parallel approach operations. Pilots must be alert to unusually long periods of silence or any unusual background sounds in their radio receiver as a stuck microphone could block the issuance of ATC instructions.
Full and proper call signs should be used to prevent the inadvertent execution of clearances intended for another aircraft or confusion due to similar sounding call signs. Lengthy or unnecessary radio transmissions must be avoided. Strict radio discipline is mandatory during simultaneous parallel approach operations. Pilots should notify ATC immediately in the event of loss or degradation of aircraft or navigation systems. Precise final approach course tracking is critical to maintaining required separation. The close proximity of aircraft conducting approaches to adjacent runways demands strict and timely compliance with ATC assigned speeds, altitudes and headings. location and proximity of the assigned runway relative to adjacent parallel runway(s).A thorough review of the Approach Chart should be conducted with emphasis on the following approach information: Parallel approach operations require heightened pilot situational awareness. This information may be provided through the ATIS. Pilots will be advised that simultaneous dependent approaches, simultaneous approaches, or simultaneous close parallel PRM approaches are in use. VOR/DME, DME/DME and IRU RNAV updating is not authorized. RNAV approach procedures that are approved for simultaneous operations require GPS as the sensor for position updating. Simultaneous Close Parallel PRM Approaches (Independent).
ILS/RNAV/GLS approaches to parallel runways are categorised as either Dependent approaches or Independent approaches. However, when centrelines are spaced by 9000' or less, special procedures must be put in force to help preclude Loss of Separation between aircraft conducting simultaneous approaches.ĪTC procedures permit ILS/RNAV/ GLS instrument approach operations to dual or triple parallel runway configurations. When parallel runway centrelines are separated by more than 9000'/2745 m (9200' if airport elevation is above 5000' MSL), no specific restrictions are imposed on simultaneous approach procedures once the aircraft is established on the final approach course.