![]() Simultaneous Offset Instrument Approach Geometry (Source: FAA AIM) ![]() ![]() This configuration is depicted in the following diagram. 5 nm of the missed approach area, the NTZ for SOIA is confined to the approach zone only and ends when the approach course centreline separation is reduced to 3000'. Whist the monitored NTZ for a PRM approach extends from the approach zone through the runways and continues for the first. However, given this configuration, aircraft on opposite approaches will converge laterally as they approach the airport.Ībbreviated NTZ - The No Transgression Zone associated with a SOIA is significantly different from that of the Close Parallel ILS PRM Approach. To ensure adequate separation between aircraft, one runway is serviced by an ILS aligned with the runway centerline whilst the approach to the opposite runway is offset by 2.5 to 3 degrees from runway heading and, depending upon runway separation, may be significantly displaced from the runway centreline abeam the runway threshold. The less than 3000' spacing between the two runways disallows the use of parallel final approach courses. Runway Spacing - The most fundamental difference between Simultaneous Offset Instrument Approaches and Close Parallel ILS PRM Approaches is the runway centreline spacing. Unique SOIA Characteristics and Procedures Whilst there are many common procedures and similarities between SOIA and Simultaneous Close Parallel Approaches, there are also some notable differences. ATC directed breakout procedures are in force. SOIA require No Transgression Zone (NTZ) monitoring, special pilot training and a dedicated Attention All Users Page (AAUP) as described in the Simultaneous Close Parallel PRM Approach article. The SOIA procedure utilizes an ILS PRM approach to one runway and an offset Localizer Type Directional Aid (LDA) PRM approach with glide slope or an RNAV PRM or GLS PRM approach utilizing vertical guidance to the adjacent runway. Simultaneous Offset Instrument Approach (SOIA) is a procedure used to conduct simultaneous approaches to runways spaced less than 3,000' (915m), but at least 750' (230m) apart.
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