Reliability Advancement for Electronic Engine Controllers. Volume 1

Abstract : This study presents a comprehensive approach to the development of full-authority electronic engine controls which are capable of meeting the high reliability levels required of aircraft turbine engine controls. The primary groundrules and assumptions are defined, including the Variable Cycle Engine, its control requirements, and service environment. A preliminary design is developed, beginning with a system description and reliability evaluation of a baseline system, including implementation of redundancy, back-up control provisions, and self-test. Through detailed system analyses and electrical and mechanical trade studies, a final preliminary design is derived. (Other topics covered include component baselines for reliability and cost studies, a discussion of reliability technology information exchanges with consulting organizations, a detailed description of reliability improvement measures including various levels of device screening and testing, and a Cost of Ownership Study). Through the effective use of measures such as fault tolerant coverage and selective duplex/triplex redundancy, the final RAEEC system developed can approach high flight safety levels and the goal for maintenance MBTF of 25,000 hours.