Fault Isolation Methodology for the L-loll Digital Avionic Flight Control System

Abstract

New L-1011 aircraft are being delivered with digital avionics including an active control system and a flight control system capable of category III automatic landings. Because of the complexity and redundancy of such systems, maintenance has traditionally been an enigma. These new aircraft are equipped with an advanced maintenance system which collects fault data from the digital flight control and active control systems for maintenance action. This report is a description of the general system architecture and an examination of the fault isolation methodology.