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The use of redundant avionic architecture on modern aircraft for both Flight Control and Mission Management has intensified the requirements for Condition Monitoring of Critical Control and Computational functions. The Application of a REAL-TIME EXECUTIVE MODULE (RTEM) provides a core element of detection for departures from norm or nominal expected performance in such systems. The RTEM performs all Fault Tolerant operations and functions including Fault Tolerant Communication, Inter-Lane Control, Synchronization, Real-Time Task Scheduling, Data Voting, Message Error Checking, Error Detection and Reporting, Graceful Degradation, Dynamic System Reconfiguration and Application Interface Specifics.

Dramatic advances in the area of Low Cost Inertial (LCI) platforms have rapidly hastened inertial navigation applicability for today's commercial and business aircraft. Even in the recent past, a navigation system's Inertial Measurement Unit (IMU) with its extremely precise sensors, has conventionally been considered a prime source of high cost. A “reduced cost system” which would be attractive to the business and private aircraft market place, should begin, therefore, with a stable element of inherent simplicity featuring drastic new low cost designs and innovations in sensors, components, and fabrication techniques. In addition, these features must offer improved reliability, reasonable maintenance concepts, and adequate performance. Finally, in order to insure its acceptance, the design of this low cost IMU must emphasize compatibility with existing aircraft interfaces and procedures.