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A Process for Utilizing Aerospace Propulsion Health Management Systems for Maintenance Credit

E-32 Aerospace Propulsion Systems Health Management
  • Aerospace Standard
  • ARP5987
  • Current
Published 2018-12-06 by SAE International in United States
The process detailed within this document is generic and can be applied to commercial and military applications. It applies to the entire end-to-end health management system throughout its lifecycle, covering on-board and on-ground elements. The practical application of this standardized process is detailed in the form of a checklist. The on-board element described here are the source of the data acquisition used for off-board analysis. The on-board aspects relating to safety of flight, pilot notification, etc., are addressed by the other SAE Committees standards and documents. This document does not prescribe hardware or software assurance levels, nor does it answer the question “how much mitigation and evidence are enough”. The criticality level and mitigation method will be determined between the ‘Applicant’ and the regulator. In order to provide some detailed guidance utilizing the process and checklist, some high-level examples of previous successful cases of Maintenance Credit applications are included. At this point, it is incumbent on the ‘Applicant’ to explain any differences in terminology between the health management system they are seeking a credit for…
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Mount - Thermocouple

E-32 Aerospace Propulsion Systems Health Management
  • Aerospace Standard
  • ARP464
  • Current
Published 2018-05-03 by SAE International in United States
No Abstract Available.
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Recommended Ice Bath for Reference Junctions

E-32 Aerospace Propulsion Systems Health Management
  • Aerospace Standard
  • ARP691
  • Current
Published 2018-05-03 by SAE International in United States
The ice bath recommended herein is similar to that described in SAE AIR 46.* Some material not presented in AIR 46, including preferred dimensions, has been added.
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Flange - Thermocouple

E-32 Aerospace Propulsion Systems Health Management
  • Aerospace Standard
  • ARP465B
  • Current
Published 2018-05-03 by SAE International in United States
This SAE Aerospace Recommended Practice (ARP) provides guidance for the design of flanges on temperature sensors intended for use in gas turbine engines. Three figures detail the configuration of standard size flange mounts with bolt holes, slotted flanges, and miniaturized flanges for small probes.
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Thermoelectric Circuits and the Performance of Several Aircraft Engine Thermocouples

E-32 Aerospace Propulsion Systems Health Management
  • Aerospace Standard
  • AIR65
  • Current
Published 2018-05-03 by SAE International in United States
No Abstract Available.
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Temperature Measuring Devices Nomenclature

E-32 Aerospace Propulsion Systems Health Management
  • Aerospace Standard
  • ARP485A
  • Current
Published 2018-05-03 by SAE International in United States
This SAE Aerospace Recommended Practice (ARP) defines the nomenclature of temperature measuring devices. General temperature measurement related terms are defined first, followed by nomenclature specific to temperature measuring devices, particularly thermocouples.
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Standard Exposed Junction Thermocouple for Controlled Conduction Errors in Measurement of Air or Exhaust Gas Temperature

E-32 Aerospace Propulsion Systems Health Management
  • Aerospace Standard
  • ARP690
  • Current
Published 2018-05-03 by SAE International in United States
The thermocouple design recommended herein is presented as one for which the correction to the observed emf, because of thermal conduction along the stem and wires, is within the limits presented in the accompanying figure. On referring to the figure, it is seen that no restriction is placed upon the diameter of the thermocouple or stem, and the longitudinal dimensions are expressed in terms of wire and stem diameters. The type of stem, such as packed ceramic stock, refractory insulating tubing, etc., also is left open to choice. Thus the sizes of wires and supporting stems may be varied over wide ranges to match particular requirements where conduction errors are to be limited or controlled.
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Guide to Engine Lubrication System Monitoring

E-32 Aerospace Propulsion Systems Health Management
  • Aerospace Standard
  • AIR1828C
  • Current
Published 2018-04-10 by SAE International in United States
This SAE Aerospace Information Report (AIR) provides information and guidance for the selection and use of technologies and methods for lubrication system monitoring of gas turbine aircraft engines. This AIR describes technologies and methods covering oil system performance monitoring, oil debris monitoring, and oil condition monitoring. Both on-aircraft and off-aircraft applications are presented. A higher-level view of lubrication system monitoring as part of an overall engine monitoring system (EMS), is discussed in ARP1587. The scope of this document is limited to those lubrication system monitoring, inspection and analysis methods and devices that can be considered appropriate for health monitoring and routine maintenance. This AIR is intended to be used as a technical guide. It is not intended to be used as a legal document or standard.
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A Guide to APU Health Management

E-32 Aerospace Propulsion Systems Health Management
  • Aerospace Standard
  • AIR5317A
  • Current
Published 2018-04-09 by SAE International in United States
AIR5317 establishes the foundation for developing a successful APU health management capability for any commercial or military operator, flying fixed wing aircraft or rotorcraft. This AIR provides guidance for demonstrating business value through improved dispatch reliability, fewer service interruptions, and lower maintenance costs and for satisfying Extended Operations (ETOPS) availability and compliance requirements.
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A Methodology for Quantifying the Performance of an Engine Monitoring System

E-32 Aerospace Propulsion Systems Health Management
  • Aerospace Standard
  • AIR4985
  • Current
Published 2017-10-13 by SAE International in United States
The purpose of this SAE Aerospace Information Report (AIR) is to present a quantitative approach for evaluating the performance and capabilities of an Engine Monitoring System (EMS). The value of such a methodology is in providing a systematic means to accomplish the following: 1 Determine the impact of an EMS on key engine supportability indices such as Fault Detection Rate, Fault Isolation Rate, Mean Time to Diagnose, In-flight Shutdowns (IFSD), Mission Aborts, and Unscheduled Engine Removals (UERs). 2 Facilitate trade studies during the design process in order to compare performance versus cost for various EMS design strategies, and 3 Define a “common language” for specifying EMS requirements and the design features of an EMS in order to reduce ambiguity and, therefore, enhance consistency between specification and implementation. The techniques used for this methodology borrow from those used for testability analysis and are modified to apply to the unique aircraft supportability definitions in item 1 above. While the discussion and examples in this document focus on aircraft engines and their components, the methods and terms in…
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