Downloaded from https://www.everyspec.com ADS-79D-HDBK (Copies of these documents are available from sources as noted.) G.3 DEFINITIONS Engine Health Monitoring System (EHMS). A system for monitoring engine usage and behavior, capable of detecting and isolating deterioration and faults, predicting the remaining useful life or time until failure, and indicating needed maintenance actions. Engine Mission Profile. A time-based description of engine operating conditions experienced in the course of a nominal mission. Engine Monitoring System (EMS). A system and process for measuring, recording, processing, and analyzing engine parameters to assess the state of the engine.
Full Authority Digital Engine Control (FADEC). An engine control system wherein the control algorithms are implemented on a digital computer. The FADEC controls all aspects of engine performance and operation. Health Monitoring. The technique of monitoring the output of a single and/or multiple condition indicators during operating conditions used to diagnose faulty states and predict future degradation of the equipment. High Cycle Fatigue (HCF). Material damage caused by high cycle (>10 5 oscillations), low amplitude loading (e.g. vibration). Life Usage Indicator.
A damage accrual calculation based on a life usage algorithm used to estimate in real time the life consumed on a life-limited part. Low Cycle Fatigue (LCF). Material damage caused by low cycle ( 5 oscillations), large amplitude loading (e.g. engine start up-shutdown cycles). Module Performance Analysis (MPA). A method of monitoring gas path performance parameters to infer the level of deterioration in the various engine modules and identifying the faulty components for maintenance actions. Performance Trending. A technique of measuring engine parameters at a stable operating condition over a period of many flights and plotting the data as a function of time. Power Assurance Analysis.
A predictive analysis to determine whether an engine will be able to provide the required power within in its operating limits based on current engine performance data. 113 Tumer, I. and A. Bajwa. A Survey of Aircraft Engine Health Monitoring Systems, AIAA Paper No. AIAA-99-2528, presented at the 35th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit, Los Angeles, CA, June 20-24, 1999 http://web.engr.oregonstate.edu/~itumer/ publications/files/survey final.pdf _ Volponi, A. and B. Wood. Engine Health Management for Aircraft Propulsion Systems, Pratt and Whitney, June 2006Can‘t find this doc – but found System Health Management: With Aerospace Applications by Volponi and Wood.