FLIGHT EXPERIENCE WITH FLIGHT CONTROL REDUNDANCY MANAGEMENT.

Flight experience with both current and advanced redundancy management schemes has been gained in recent NASA flight research programs using the F-8 digital fly-by-wire aircraft. This paper reviews the flight performance of fault detection, isolation, and reconfiguration (FDIR) methods for sensors, computers, and actuators. Results of induced failures as well as of actual random failures are discussed. Deficiencies in modeling and implementation techniques are also discussed. The paper also presents comparisons of multisensor tracking in smooth air, in turbulence, during large maneuvers, and during maneuvers typical of those of large commercial transport aircraft.