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Evaluation of Gas Turbine Engine Lubricant Compatibility with Elastomer Slabs - Long Duration Test

E-34 Propulsion Lubricants Committee
  • Aerospace Standard
  • ARP6917
  • Current
Published 2018-12-10 by SAE International in United States

This test method provides procedures for exposing specimens of elastomer material (slab form) representative to those used in gas turbine engines to aviation lubricants under extended duration and engine relevant thermal conditions. For AS5780 requirements the time is at least 1800 hours and temperatures are 100 °C to 160 °C. Positive volume change is an indication of specimen swell and subsequent negative volume change is an indication of specimen deterioration, both properties are important in the evaluation of the compatibility of the lubricant with elastomers used in the construction of the gas turbine.

Fluid, Reference for Testing AS5780 HPC Class (Polyol) Resistant Material (Also known as Eastman Reference Oil 300)

E-34 Propulsion Lubricants Committee
  • Aerospace Material Specification
  • AMS3085B
  • Current
Published 2018-04-19 by SAE International in United States
This specification covers a neopentyl polyol ester fluid (see 8.2) with AS5780 HPC or MIL-PRF-23699 HTS Class performance.
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Specification for Aero and Aero-Derived Gas Turbine Engine Lubricants

E-34 Propulsion Lubricants Committee
  • Aerospace Standard
  • AS5780D
  • Current
Published 2018-03-04 by SAE International in United States
This specification defines basic physical, chemical, and performance limits for 5 cSt grades of gas turbine engine lubricating oils used in aero and aero-derived marine and industrial applications, along with standard test methods and requirements for laboratories performing them. It also defines the quality control requirements to assure batch conformance and materials traceability, and the procedures to manage and communicate changes in oil formulation and brand. This specification invokes the Performance Review Institute (PRI) product qualification process. Requests for submittal information may be made to the PRI at the address in Appendix D Section D.2, referencing this specification. Products qualified to this specification are listed on a Qualified Products List (QPL) managed by the PRI. Additional tests and evaluations may be required by individual equipment builders before an oil is approved for use in their equipment. Approval and/or certification for use of a specific gas turbine oil in aero and aero-derived marine and industrial applications is the responsibility of the individual equipment builders and/or governmental authorities and is not implied by compliance with or qualification…
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Evaluation of Gas Turbine Engine Lubricant Compatibility with Elastomer O-Rings

E-34 Propulsion Lubricants Committee
  • Aerospace Standard
  • ARP6179
  • Current
Published 2017-09-19 by SAE International in United States
This test method provides procedures for exposing specimens of elastomer materials (AS 568-214 size O-rings) representative of those used in gas turbine engines to lubricants or reference fluids under defined time and temperature conditions. This test includes both suspended and compressed O-rings. Resultant changes in the O-ring’s physical properties (tensile strength, elongation, hardness, mass, volume, and compression set) are measured to determine the amount of deterioration of the elastomer.
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Specification for Aero and Aero-Derived Gas Turbine Engine Lubricants

E-34 Propulsion Lubricants Committee
  • Aerospace Standard
  • AS5780C
  • Historical
Published 2017-08-04 by SAE International in United States
This specification defines basic physical, chemical, and performance limits for 5 cSt grades of gas turbine engine lubricating oils used in aero and aero-derived marine and industrial applications, along with standard test methods and requirements for laboratories performing them. It also defines the quality control requirements to assure batch conformance and materials traceability, and the procedures to manage and communicate changes in oil formulation and brand. This specification invokes the Performance Review Institute (PRI) product qualification process. Requests for submittal information may be made to the PRI at the address in Appendix D Section D.2, referencing this specification. Products qualified to this specification are listed on a Qualified Products List (QPL) managed by the PRI. Additional tests and evaluations may be required by individual equipment builders before an oil is approved for use in their equipment. Approval and/or certification for use of a specific gas turbine oil in aero and aero-derived marine and industrial applications is the responsibility of the individual equipment builders and/or governmental authorities and is not implied by compliance with or qualification…
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WAM Pressure-Viscosity Coefficient Measurement

E-34 Propulsion Lubricants Committee
  • Aerospace Standard
  • ARP6157
  • Current
Published 2017-05-18 by SAE International in United States
The lubricant performance capability for aero propulsion drive systems is derived from the physical properties of the oil and performance attributes associated with the chemical properties of the oil. Physical properties, such as viscosity, pressure-viscosity coefficient and full-film traction coefficient are inherent properties of the lubricating fluid. Chemical attributes are critical for the formation of protective boundary lubricating films on the surfaces to prevent wear and scuffing. These attributes are also associated with surface initiated fatigue (micropitting). To assure performance and to provide required information for engineering design, methodology for at least five oil properties are being studied: (1) pressure-viscosity coefficient, (2) full-film traction coefficient, (3) scuffing resistance, (4) wear resistance; and (5) micropitting propensity. The pressure-viscosity coefficient can be measured either directly by assessing viscosity as a function of pressure using high-pressure apparatus, or indirectly by measuring film thickness in an optical interferometer. This document (ARP6157) describes the test method for calculating the pressureviscosity coefficient by measuring film thickness with a WAM (Wedeven Associates Machine) and the calculating pressure-viscosity coefficient from the measured film…
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WAM High Speed Load Capacity Test Method

E-34 Propulsion Lubricants Committee
  • Aerospace Standard
  • ARP6156
  • Current
Published 2017-04-05 by SAE International in United States
The lubricant performance capability for aero propulsion drive systems is derived from the physical properties of the oil and the chemical attributes associated with the oil formulation. All properties, such as viscosity, pressure-viscosity coefficient and full-film traction coefficient are inherent properties of the lubricating fluid. Chemical attributes are critical for the formation of protective boundary lubricating films on the surfaces to prevent wear and scuffing. To assure performance and to provide needed information for engineering design, test methodologies for at least five oil properties or attributes are being addressed: (1) pressure-viscosity coefficient, (2) full-film traction coefficient, (3) scuffing resistance, (4) wear resistance, and (5) micropitting propensity. While viscosity versus temperature data are readily available, the above five properties or attributes must be measured under relevant conditions for aero propulsion hardware systems. This document (ARP6156) describes the test method for scuffing and wear resistance. It should be noted that the test method results are limited to the selected test conditions, which may not be representative of the broad scope of conditions encountered in service.
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A Review of Literature on the Relationship Between Gas Turbine Engine Lubricants and Aircraft Cabin Air Quality

E-34 Propulsion Lubricants Committee
  • Aerospace Standard
  • AIR5784
  • Current
Published 2016-09-12 by SAE International in United States
There has been a recent upsurge in interest from the media concerning the quality of the environment within aircraft cabins and cockpits especially in the commercial world1-4. This has included (although by no means been limited to) the air quality, with particular reference to the alleged effects of contamination from the aircraft turbine lubricant. Possible exposure to ‘organophosphates’ (OPs) from the oil has raised special concerns from cabin crew. Such is the concern that government organisations around the world, including Australia, USA and UK, have set up committees to investigate the cabin air quality issue. Concern was also voiced in the aviation lubricants world at the way in which OP additives in turbine lubricants were being blamed in some reports for the symptoms being experienced by air crew and passengers. SAE Committee E-34 therefore decided that it should gather as much available information on the subject as possible. This would then enable E-34 to participate in debates on the issue and help prevent a potentially erroneous decision regarding the future of OP based additives in…
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Test Method for the Determination of Water Concentration in Polyol Ester and Diester Aerospace Lubricants by Coulometric Karl Fischer Titration

E-34 Propulsion Lubricants Committee
  • Aerospace Standard
  • ARP5991
  • Current
Published 2016-09-12 by SAE International in United States
The test method describes the procedure for the direct determination of water concentration in polyol ester and diester based aerospace lubricants by the commercially available automated coulometric Karl Fischer titration instrument. The method was validated to cover the water concentration range of 150 to 3500 µg/g. The method may also be suitable for the determination of water concentrations outside this range and for other classes of fluids, however, the precision statement shall not be applicable for such uses.
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Minisimulator Method

E-34 Propulsion Lubricants Committee
  • Aerospace Standard
  • ARP6166
  • Current
Published 2016-09-12 by SAE International in United States
This test method is designed to simulate the synergistic combinations of oil flow, temperature cycling, hot spots, and tribology that would typically be found in a gas turbine engine. The method is intended to quantitatively characterize changes in four basic oil properties that are brought about by exposure to the afore mentioned simulated turbine engine environment: the tendency of aviation lubricants to form coke deposits, viscosity changes, total acid number changes (TAN), and oil consumption.
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