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This document specifies requirements for both an airborne Microwave Landing System (MLS) receiver and an MLS area navigation (MLS/RNAV) system. This equipment shall derive aircraft position and guidance for flight along precision three-dimensional paths within the MLS coverage.

This document specifies requirements for an Approach to Landing Guidance System (ALGS) electronic device. This equipment shall display relative aircraft position and situation information for flight along precision three-dimensional paths within the appropriate coverage area. The precision three-dimensional path may be an ILS straight-in look-alike path or a complex, curved path. The requirements are applicable to electronic devices capable of receiving signals or other information from one or more sources, including but not limited to ILS, GNSS, or IRU inputs.

This document specifies requirements for an Airborne Landing Guidance System (ALGS) electronic device. This equipment shall derive relative aircraft position and situation information for flight along precision three-dimensional paths within the appropriate coverage area. The precision three-dimensional path may be an ILS straight-in look-alike path or a complex, curved path. The requirements are applicable to electronic devices capable of receiving signals or other information from one or more sources, including but not limited to ILS, MLS, GNSS, or IRU inputs.