scope:

This Part 3 is one of a group of specification documents under the basic heading "VOR/VORTAC Equipment Replacement and Modernization," each of which carries the basic number FAA-E-2678 with a slant line and number corresponding to the Part number. Part 3 of the specification covers the requirements for the Facility Central Processing Unit (FCPU) to be furnished as part of a set of equipment as defined in Part 1 of this specification (FAA-E-2678/1). The FCPU makes the determination of the status of all monitors (VOR and DME/TACAN) through the initiation of automatic limit tests upon monitor discrepancies and periodically for certification verification (3-3.3.2.2). The FCPU stores and transmits all data available for use at a remote site (See FAA-E-2678/9). The FCPU software stores all data (faults, alarms and shutdowns) for future availability and historical record keeping.