SOIA

An instrument landing system comprised of an ILS PRM, RNAV PRM or GLS PRM approach to one runway and an offset LDA PRM with glideslope or an RNAV PRM or GLS PRM approach utilizing vertical guidance to another where parallel runways are spaced less than 3,000 feet and at least 750 feet apart.

Source FAA Pilot/Controller Glossary↗ · checked 2026-08-25