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This Aerospace Information Report (AIR) describes a Limited Engine Monitoring System that can be used by the flight crew or the maintenance staff, or both, to monitor the health of gas turbine engines in aircraft. This AIR considers monitoring of gas path performance and mechanical parameters, and systems such as low cycle fatigue counters and engine history recorders. It also considers typical measurement system accuracies and their impact. This AIR is intended as a technical guide. It is not intended to be used as a legal document or standard. AIR 1873 supplements ARP 1587, Aircraft Gas Turbine Engine Monitoring System Guide.The Aerospace Information Report (AIR) has been superseded by a completely new document, ARP5120, which provides guidance on how to develop and implement an integrated end-to-end health management system for gas turbine engine applications. The original AIR1873A information was updated and transformed into ARP5120. SAE ARP5120 consolidates SAE AIR1873, 4061B, 4175A, and 5120 into one document per the direction of the SAE E32 committee.
Overview of engine control systems -- Engine modeling and simulation -- Model reduction and dynamic analysis -- Design of set-point controllers -- Design of transient and limit controllers -- Control system integration -- Advanced control concepts -- Engine monitoring and health management -- Integrated control and health monitoring -- Appendix A. Fundamentals of automatic control systems -- Appendix B. Gas turbine engine performance and operability.
The purpose of this study was to identify if the data collected by Turbine Engine Monitoring Systems (TEMS) could benefit an engine's Component Improvement Program (CIP) management. The initial plan was to identify and assess any benefits by comparing an engine with a CIP (PWA TF30) but not TEMS against an engine with a CIP and a TEMS (GE TF34). This was not possible, however, because the TEMS data were not being used to assist with TF34 CIP management because of the lack of a Central Data Base to collate and transform the data. The engine duty cycle was identified as the key to many important areas of a CIP, including engine component life usage and failure replication and diagnosis. As mentioned in the previous paragraph, the current methods used to identify as engine's duty cycle lack the accuracy and reliability that are required to manage modern gas turbine engines. The main thrust of the recommendations is that a central data base be established so that the TF34 CIP manager can utilize TEMS data. In addition, a comparison using cost analysis is recommended to firmly establish the benefits to both long and short term engine management. Keywords: Theses; Aircraft engines.
This SAE Aerospace Recommended Practice (ARP) is a system guide for Engine Monitoring System (EMS) definition and implementation. This keystone document addresses EMS benefits, capabilities, and requirements. It includes EMS in-flight and ground applications consisting of people, equipment, and software. It recommends EMS requirements that are a balance of selected benefits and available capabilities. This ARP purposely addresses a wide range of EMS architecture. The intent is to provide an extensive list of possible EMS design options.NOTE: aSection 3 describes an EMS. bSections 4 and 5 outline benefits and capabilities that should be considered for study purposes to define EMS baselines for how much engine monitoring is required. cSection 6 provides implementation requirements that should be considered for an EMS after study baseline levels of EMS complexity are selected.