scope:

- This Part 5 contains the requirements which are applicable alone or in conjunction with other parts of this ER, to the design, fabrication, testing, installation, and field validation of the ILS subsystem of a CCD/RMM system to be installed and operated in FAA terminal facilities. The ILS subsystem consists of a facility processing unit (FPU) for each ILS remote site to be monitored. Each FPU shall be comprised of a microcomputer, data communications unit (modem), status /control interface, and an unterruptable power supply. An FPU makes the determination of the status of ILS monitors at a site (i. e., localizer, glideslope, markers, far field monitor), through the initiation of automatic tests upon monitor discrepancies (in the case of dual monitors) and periodically (for single and dual monitors) for certification type data. The FPU stores and transmits all data available for use at the Central Processing Subsystem (CPS).