[ASME ASME 1991 International Gas Turbine and Aeroengine Congress and Exposition - Orlando, Florida, USA (Monday 3 June 1991)] Volume 5: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education; IGTI Scholar Award; General - Optimal Measurements and Health Indices Selection for Gas Turbine Performance Status and Fault Diagnosis