Multi-Mode Receivers (MMR) are integrated avionics units that consolidate ILS (Instrument Landing System), MLS (Microwave Landing System), and GPS/GNSS landing functions within a single LRU, supporting CAT I, II, and III precision approach operations. Processing RF signals across multiple frequency bands, MMRs interface with flight management systems via ARINC 429 or ARINC 743A data buses to provide lateral and vertical deviation guidance.
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