Using Microprocessors in Fault Monitoring of Aircraft Electronics

Abstract

This paper discusses the Ultra Electronic Controls Fault Identification Moduel (F.I.M.) as used in the Electronic Engine Control Unit (E.C.U.) for the Olympus 593 engines of the Concorde Supersonic Transport Aircraft. This is based on a C.M.O.S. Microprocessor for low power consumption and enables the Module to be applied to existing units without redesign of power supplies. The Module examines the outputs of existing fault monitoring circuits and compares these with software defined reference levels. It then determines from this and other signals taken from the E.C.U. safety consolidation circuits, the Engine Control Sub-System which is at fault. This Module has been in service with British Airways and Air France for close to one year now and the impact on rapid and accurate fault diagnosis, elimination of premature E.C.U. removals and thus reduction of cost ownership of the E.C.U. is discussed.