Downloaded from https://www.everyspec.com ADS-79D-HDBK capabilities using more accurate APU models, particularly models of the APU start condition, combined with fault model knowledge. 34 G.7 SPECIFIC GUIDANCE The following subsections provide specific guidance for turbine engine monitoring systems for use in a condition based maintenance program . See Tables G-II through G-VIII. G.7.1 Data Collection. Usage monitoring systems and condition monitoring systems both rely extensively on sensors and processors to monitor, record, and process engine parameter data.
Usage monitoring systems should capture segments of raw data and employ signal conditioning or time synchronizing routines where appropriate. Segments of raw data preceding anomalies or actual faults detected should be captured and available for downloading to enhance algorithm development and validation. The following guidance on data collection is relevant to both types of systems. G.7.1.1 Sensors. Parameter measurements are defined by engine manufacturers based on the algorithms used. Typical parameters for usage monitoring can be categorized in four groups 35 (Note: Specific guidance on oil quality and debris sensors is provided in Appendix M.) 34 Shetty, P., D. Mylaraswamy, T.
Ekambaram, ―A Hybrid Prognostic Model Formulation and Health Estimation of Auxiliary Power Units,‖ ASME Journal of Engineering for Gas Turbines and Power, Vol. 130, March 2008. 35 RTO TR 28, ―Recommended Practices for Monitoring Gas Turbine Engine Life Consumption‖, North Atlantic Treaty Organization, Research and Technology Organization, April 2000, pg. 8-7.
122 Table G-II Engine parameters Spool speeds, shaft speeds Engine intake temperature Compressor inlet temperature Stator outlet temperature Oil Pressure Exhaust gas temperature Interturbine temperature Turbine Exit temperature Engine intake pressure Compressor exit pressure Oil temperature Fuel flow Torque Throttle command Table G-III Aircraft parameters Outside air temperature Indicated airspeed Pressure altitude G load, normal acceleration Weight on wheels indicator Table G-IV Discretes and events Date and time Starts Temperature events Speed events Cycle counts Stall events Table G-V Configuration data Aircraft type, aircraft variant Engine type, engine variant Monitoring system hardware and software version numbers Aircraft and engine serial numbers Engine Inlet variant (e.g.
FOD Screen/Barrier Filter/Particle Separator Exhaust variant (e.g. Standard Tailpipe/IR Suppressor)