Browse Topic: Gas turbine lubricants

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Procedure for Thermal Aging Test for Polyol Ester Gas Turbine Engine LubricantsARP6299A (Current)7/17/2026
This method is intended to evaluate the thermal and oxidative stability of synthetic, ester-based aviation lubricants under defined conditions of time and temperature. This method is applicable to lubricants meeting the compositional and performance requirements of AS5780.
E-34 Propulsion Lubricants Committee
Literature on Gas Turbine Engine Lubricant Composition and Degradation Relevant to Cabin Air QualityAIR5784A (Current)10/15/2025
The previous revision of AIR5784 summarizes some of the available literature on cabin air study, engine oil composition, decomposition, and toxicity testing. This revision of AIR5784 includes literature and information on stakeholder involvement, selected air sampling studies, oil composition, and oil degradation, published from 2000 to 2023. The entire contents of the reviewed literature are not necessarily endorsed by either SAE or the members of the study group who produced it. This is not a comprehensive review but is intended to enable E-34 and other technical organizations to participate in informed discussions on the topic. Also, the review is intended to indicate where additional work may be necessary to properly gauge the potential role that turbine lubricants (and OPs) play in cabin air quality. The toxicology of oil fumes and their individual constituents is beyond the scope of this document and outside the remit of this committee.
E-34 Propulsion Lubricants Committee
Specification for Aero and Aero-Derived Gas Turbine Engine LubricantsAS5780E (Current)7/17/2025
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 PRI at the address in 2.1.3, referencing this specification. Products qualified to this specification are listed on a Qualified Products List (QPL) managed by PRI. Additional tests and evaluations may be required by individual OEMs before an oil is approved for use in their equipment. Approval and/or certification for use of a specific gas turbine engine oil in aero and aero-derived marine and industrial applications is the responsibility of the individual OEMs and/or governmental authorities and is not implied by compliance with or qualification to this specification.
E-34 Propulsion Lubricants Committee
Aviation Lubricant Tribology Evaluator (ALTE) Method to Determine the Lubricating Capability of Gas Turbine LubricantsARP6255A (Current)5/16/2025
Employing “ball-on-ring” philosophy, a nonrotating steel ball is held in a vertically mounted chuck and, using an applied load, is forced against an axially mounted steel rotating ring. The test ring is rotated at a fixed speed while being partially immersed in a lubricant reservoir. This maintains the ring in a wet condition and continuously transports a lubricating film of test fluid to the ball and ring interface. The diameter of the wear scar generated on the test ball is used as a measure of the fluid’s lubricating properties. The apparatus can be used by adjusting the operating conditions to reproduce two different wear mechanisms. Therefore, the ALTE can assess a lubricant’s performance in that regard. These mechanisms are described below.
E-34 Propulsion Lubricants Committee
Gas Turbine Engine Lubricant Specifications: Current Technical Review and Future DirectionAIR6056A (Current)12/4/2024
This AIR describes the current scientific and engineering principles of gas turbine lubricant performance testing per AS5780 and identifies gaps in our understanding of the technology to help the continuous improvement of this specification. Test methodologies under development will also be described for consideration during future revisions of AS5780.
E-34 Propulsion Lubricants Committee
Traction Coefficient MeasurementARP6243 (Current)12/4/2024
The lubricant performance capability for aero-propulsion drive systems is derived from the physical properties, chemical properties, and the transport phenomena of the oil. Viscosity, pressure-viscosity coefficient, and elastohydrodynamic (EHD) full-film traction coefficient are inherent properties of the lubricating fluid. Full-film traction coefficient is a required input for thermal performance prediction and engineering design. Traction coefficient data can be modeled and used as an input into bearing and gear analysis codes. This document describes a test method for traction coefficient measurement of 5 cSt oils under service-like conditions for high-stress Hertzian elastic contacting bodies operating under temperatures and sliding (slip) velocities found in high-speed rolling element bearings and gears.
E-34 Propulsion Lubricants Committee
Test Method for the Determination of Total Acidity in Polyol Ester and Diester Gas Turbine Lubricants by Automatic Potentiometric TitrationARP5088C (Current)3/18/2024
The test method describes the procedure for determination of the total acid number (TAN) of new and degraded polyol ester and diester-based gas turbine lubricants by the potentiometric titration technique. The method was validated to cover an acidity range of 0.05 to 6.0 mg KOH g-1. The method may also be suitable for the determination of acidities outside of this range and for other classes of lubricants.
E-34 Propulsion Lubricants Committee
Evaluation of Fouling Propensity of Aviation Lubricants Using the Mixed-Phase Flow Technique (High-Temperature Deposition Test)ARP8462 (Current)10/5/2023
The high-temperature deposition test (HTDT) method is designed to evaluate the deposition and degradation characteristics of turbine lubricants when stressed under mixed-phase flow conditions found in certain parts of aviation gas turbine engines. This method is applicable to lubricants that form deposits in the range of 0.1 to 100 mg during the course of a test.
E-34 Propulsion Lubricants Committee
MPR Micropitting Test MethodARP6991 (Current)6/1/2023
This method is designed to evaluate the micropitting performance of currently available and future aviation turbine oil formulations. Drawing on previously performed tests documented in AIR6989, the method comprises of three rings rotating against a rotating central roller configuration using the standard, commercially available PCS Instruments Micropitting Rig (MPR). A test profile has been developed between industry and academia that relies on standard, commercially available test specimens.
E-34 Propulsion Lubricants Committee
Compatibility of Turbine Lubricating OilsARP7120 (Current)5/1/2023
This method is used for determining the compatibility of a candidate lubricant with specific reference lubricants. The reference lubricants to be used will typically be mandated by the owner of the product specification against which the candidate lubricant is being compared. This method is split into two procedures (Procedure A and Procedure B) with a summary of each procedure contained in Section 4.
E-34 Propulsion Lubricants Committee
Procedure for Development of a Test MethodARP8830 (Current)2/20/2023
The document is a recommended guide for evaluating new or replacement test methods. It considers applicability, suitability, accessibility, and return on effort. Particular emphasis should be placed on completing the “strategy definition” portion of this document (Stage 2), to capture all relevant process stages and complete in a recognizable order for any specific development project. The overall process should: 1 address the rationale behind testing; 2 result in a thorough review of whether a test is fit for purpose; 3 act as a pathway for vetting if a test should be added to AS5780. If, in any project, this process is not an exact fit, users should feel free to adjust, as necessary. The process provides the following stages:
E-34 Propulsion Lubricants Committee
Micropitting of Bearings and Gears in AviationAIR6989 (Current)12/7/2022
The intent of this SAE Aerospace Information Report (AIR) is to summarize and review the E34 committee’s efforts to educate the aerospace propulsion lubrication community on the science of micropitting, its consequences, and the various tribology evaluation methods that can be employed under aviation related conditions to differentiate formulation related aggravating factors.
E-34 Propulsion Lubricants Committee
Storage of Elastomer Seals and Seal Assemblies Which Include an Elastomer Element Prior to Hardware AssemblyAS5316 (Current)11/18/2022
This SAE Aerospace Standard (AS) specifies the general requirements for data recording procedures, packaging, and storing of elastomeric seals and seal assemblies which include an elastomeric element prior to the seal being assembled into hardware components. NOTE: The requirement for packaging is an integral part of the controlled storage procedure and provides a means of positive product identity from the time of manufacture to the time of assembly into a component.
A-6C2 Seals Committee
WAM High Speed Load Capacity Test MethodARP6156 (Current)9/23/2022
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.
E-34 Propulsion Lubricants Committee
Evaluation of Gas Turbine Engine Lubricant Compatibility with Elastomer O-RingsARP6179 (Current)8/24/2022
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.
E-34 Propulsion Lubricants Committee
O-Ring Molded from AMS7273 Fluorosilicone (FVMQ) Rubber MaterialAS9967B (Current)6/27/2022
This standard establishes the dimensional and visual quality requirements, lot requirements, and packaging and labeling requirements for O-rings molded from AMS7273 rubber. It shall be used for procurement purposes.
A-6C2 Seals Committee
O-RING MOLDED FROM AMS7287 MATERIALAS83485B (Current)5/24/2022
A-6C2 Seals Committee
O-RING MOLDED FROM AMS7259 MATERIALAS83248/2A (Current)11/9/2021
A-6C2 Seals Committee
O-RING MOLDED FROM AMS7276 MATERIALAS83248/1A (Current)11/8/2021
A-6C2 Seals Committee
Elastomer Compatibility Considerations Relative to Elastomer SelectionAIR786C (Current)9/1/2021
This SAE Aerospace Information Report (AIR) contains data relative to the chemical nature of aerospace fluids and relates each to its empirical effect upon elastomeric components. Since the compatibilities of elastomers are determined by the compounding as well as the nature of the base polymer, the elastomers considered are limited to finished compounds for which material or performance specifications can be referenced.
A-6C2 Seals Committee
Supplemental Information for Design of Measuring Devices for Measurement of Aircraft Cabin Air QualityAIR6945 (Current)7/15/2021
This document provides information applicable to the design and development of portable and aircraft mounted cabin air contaminant sensors. This AIR complements any future portable or aircraft-mounted cabin air sensor standards.
AC-9M Cabin Air Measurement Committee
Airborne Chemicals in Aircraft CabinsAIR4766/2A (Current)6/22/2021
This SAE Aerospace Information Report (AIR) provides information on aircraft cabin air quality, including: Origins of chemical airborne contaminants during routine operating and failure conditions. Exposure control measures, including design, maintenance, and worker training/education. This AIR does not deal with airflow requirements.
AC-9 Aircraft Environmental Systems Committee
Procedure for Thermal Aging Test for Polyol Ester Gas Turbine Engine LubricantsARP6299 (Historical)9/1/2020
This method is intended to evaluate the thermal and oxidative stability of synthetic, ester-based aviation lubricants under defined conditions of time and temperature. This method is applicable to lubricants meeting the compositional and performance requirements of AS5780.
E-34 Propulsion Lubricants Committee
Pressure-Viscosity Coefficient MeasurementARP6157A (Current)6/15/2020
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 following two alternative test instruments for calculating the pressure viscosity coefficient by measuring the fluid film thickness: i PCS EHD2 test instrument ii WAM test machine Both methods have been shown to give similar results, therefore either method can be used to calculate the pressure viscosity coefficient of a sample lubricant. For details of how to set up and run either method, see Section 7 (PCS-EHD) or Section 8 (WAM).
E-34 Propulsion Lubricants Committee
Assessment of Elastomer Volume Swelling Behavior in Aero-Derived Gas Turbine Engine Lubricants - Short Duration TestARP7355 (Current)2/20/2020
This method is used for determining the volume swelling effect of aero-derived gas turbine engine lubricants on elastomeric materials. It provides insight into the expected performance of a candidate lubricants impact upon elastomer swell and provides data to determine if the candidate lubricant meets specification requirements. This ARP is based upon Federal Standard 791, Method 3604.
E-34 Propulsion Lubricants Committee
O-Ring Molded from AMS7273 MaterialAS9967A (Historical)1/9/2020
This standard establishes the dimensional and visual quality requirements, lot requirements, and packaging and labeling requirements for O-rings molded from AMS7273 rubber. It shall be used for procurement purposes.
A-6C2 Seals Committee
Management of Change Considerations for Aero Gas Turbine Engine Lubricants Under AS5780AIR6918 (Current)12/2/2019
The intent is to provide a reference which explains the types of possible changes to AS5780 products and provide appropriate context to the QPG. All product change requests to the QPG will be evaluated on their merits recognizing the content of this AIR is guidance only.
E-34 Propulsion Lubricants Committee
O-Ring Molded from AMS7287 Material, MetricMA3445A (Current)7/10/2019
These products have been used in contact with air and a wide variety of fuels, lubricants, specific hydraulic fluids, and a variety of gas turbine engine lubricants, including higher thermo-oxidative stability (HTS) lubricants, including those conforming to MIL-PRF-23699 Class HTS, MIL-PRF-7808 Grade 4, and AS5780 Class HPC; however, usage is not limited to such applications. This material type has a typical service temperature range of -20 to +400 °F (-28 to +204 °C). These products are not suitable for use in phosphate ester based hydraulic fluids. Each application should be considered individually.
A-6C2 Seals Committee
Evaluation of Gas Turbine Engine Lubricant Compatibility with Elastomer Slabs - Long Duration TestARP6917 (Current)12/10/2018
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.
E-34 Propulsion Lubricants Committee
Storage of Elastomer Seals and Seal Assemblies Which Include an Elastomer Element Prior to Hardware AssemblyARP5316E (Current)10/30/2018
This SAE Aerospace Recommended Practice (ARP) addresses the general requirements for data recording procedures, packaging, and storing of elastomeric seals and seal assemblies which include an elastomeric element prior to the seal being assembled into hardware components. It applies specifically to those elastomeric seals and seal assemblies packaged shortly after manufacture. The storage period prior to installation of the elastomeric seals and seal assemblies into hardware components is commonly referred to as shelf life. The information contained in this ARP is intended to be utilized by those organizations who do not have specific requirements or recommendations already in place for the control of elastomeric seals and seal assemblies. This ARP can be specified in control, storage, and procurement documents. However, when the requirements of this document are in conflict with the customer's requirements or specifications, the requirements of the customer's detailed specification shall govern.
A-6C2 Seals Committee
Guide to Engine Lubrication System MonitoringAIR1828C (Historical)4/10/2018
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.
E-32 Aerospace Propulsion Systems Health Management
Specification for Aero and Aero-Derived Gas Turbine Engine LubricantsAS5780D (Historical)3/4/2018
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 to this specification.
E-34 Propulsion Lubricants Committee
Specification for Aero and Aero-Derived Gas Turbine Engine LubricantsAS5780C (Historical)8/4/2017
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 to this specification.
E-34 Propulsion Lubricants Committee
WAM Pressure-Viscosity Coefficient MeasurementARP6157 (Historical)5/18/2017
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 thickness.
E-34 Propulsion Lubricants Committee
O-RING MOLDED FROM AMS7287 MATERIALAS83485A (Historical)10/13/2016
A-6C2 Seals Committee
A Review of Literature on the Relationship Between Gas Turbine Engine Lubricants and Aircraft Cabin Air QualityAIR5784 (Historical)9/12/2016
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 turbine lubricants. It would also serve as an indicator of where any additional work may be necessary to properly gauge the role that turbine lubricants, and OP additives, play in cabin air quality. This report summarises recent documentation from the literature on this subject. The contents do not necessarily represent the views of the SAE or any of the members of the study group who produced this review. The literature falls into three categories: Air quality (Section 5), which includes: Future systems to improve air quality Research plans into investigating cabin air quality Chemistry of turbine lubricants, phosphate esters (Section 6), including evaluation of products found in cabin air and thermal breakdown products of lubricants. Toxicity evaluation of turbine oils and additives (Section 7).
E-34 Propulsion Lubricants Committee
Minisimulator MethodARP6166 (Current)9/12/2016
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.
E-34 Propulsion Lubricants Committee
Fluid, Reference for Testing AS5780 HPC Class (Polyol) Resistant Material (Also known as Eastman Reference Oil 300)AMS3085A (Historical)5/4/2016
This specification covers a neopentyl polyol ester fluid (see 8.2) with AS5780 HPC or MIL-PRF-23699 HTS Class performance.
E-34 Propulsion Lubricants Committee
Bearing Corrosion Test MethodARP4249A (Current)8/28/2015
This SAE Aerospace Recommended Practice (ARP) is intended to evaluate corrosion inhibiting properties of synthetic gas turbine lubricants and gearbox oils.
E-34 Propulsion Lubricants Committee
O-ring Molded from AMS7276 MaterialAS83248/1 (Historical)12/12/2014
A-6C2 Seals Committee
O-ring Molded from AMS7259 MaterialAS83248/2 (Historical)12/12/2014
A-6C2 Seals Committee
Measuring Aircraft Gas Turbine Engine Fine Fuel Filter Element PerformanceARP1827C (Historical)11/20/2014
This SAE Aerospace Recommended Practice (ARP) delineates two complementary filter element performance ratings: (1) dirt capacity, and (2) filtration efficiency, and corresponding test procedures. It is intended for non-cleanable (disposable), fine fuel filter elements used in aviation gas turbine engine fuel systems.
AE-5B Aircraft and Engine Fuel and Lubricant Sys Components
O-Ring Molded from AMS7287 MaterialAS83485 (Historical)11/20/2014
A-6C2 Seals Committee
Elastomer Compatibility Considerations Relative to Elastomeric Sealant SelectionAIR786B (Historical)11/6/2014
This document contains data relative to the chemical nature of aerospace fluids and relates each to its empirical effect upon elastomeric components. Since the compatibilities of elastomers are determined by the compounding as well as the nature of the base polymer, the elastomers considered are limited to finished compounds for which material or performance specifications can be referenced.
A-6C2 Seals Committee
Storage of Elastomer Seals and Seal Assemblies Which Include an Elastomer Element Prior to Hardware AssemblyARP5316D (Historical)10/30/2014
This SAE Aerospace Recommended Practice (ARP) addresses the general requirements for data recording procedures, packaging, and storing of elastomeric seals and seal assemblies which include an elastomeric element prior to the seal being assembled into hardware components. It applies specifically to those elastomeric seals and seal assemblies packaged shortly after manufacture. The storage period prior to installation of the elastomeric seals and seal assemblies into hardware components is commonly referred to as shelf life. The information contained in this ARP is intended to be utilized by those organizations who do not have specific requirements or recommendations already in place for the control of elastomeric seals and seal assemblies. This ARP can be specified in control, storage, and procurement documents. However, when the requirements of this document are in conflict with the customer's requirements or specifications, the requirements of the customer's detailed specification shall govern.
A-6C2 Seals Committee
Multi-Pass Method for Evaluating Filtration Performance of Fine Lube Filter Elements Utilized in Aerospace Power and Propulsion Lubrication SystemsARP5454B (Historical)10/8/2014
This SAE Aerospace Recommended Practice (ARP) describes the multi-pass method for evaluating the filtration performance of fine lube filter elements, commonly utilized in aerospace power and propulsion lubrication systems: gas turbine engines, auxiliary power units (APUs), helicopter transmissions, constant speed drives (CSDs), and integrated drive generators (IDGs).
AE-5B Aircraft and Engine Fuel and Lubricant Sys Components
Gas Turbine Engine Lubricant Specifications: Current Technical Review and Future DirectionAIR6056 (Historical)8/20/2014
This AIR describes the current scientific and engineering principles of gas turbine lubricant performance testing per AS5780 and identifies gaps in our understanding of the technology to help the continuous improvement of this specification.
E-34 Propulsion Lubricants Committee
Test Method for the Determination of Total Acidity in Polyol Ester and Diester Gas Turbine Lubricants by Automatic Potentiometric TitrationARP5088B (Historical)7/8/2014
The test method describes the procedure for determination of the total acid number of new and degraded polyol ester and diester based gas turbine lubricants by potentiometric titration technique. The method was validated to cover an acidity range 0.05 to 6.0 mg KOH g-1. The method may also be suitable for the determination of acidities outside of this range and for other classes of lubricant.
E-34 Propulsion Lubricants Committee
Evaluation of Coking Propensity of Aviation Lubricants in an Air-Oil Mist Environment using the Vapor Phase CokerARP5921 (Historical)4/3/2014
This method is designed to evaluate the coking propensity of synthetic ester-based aviation lubricants under two phase air-oil mist conditions as found in certain parts of a gas turbine engine, for instance, bearing chamber vent lines. Based on the results from round robin data in 2008–2009 from four laboratories, this method is currently intended to provide a comparison between lubricants as a research tool; it is not currently a satisfactory pass/fail test. At this juncture a reference oil may improve reproducibility (precision between laboratories); a formal precision statement will be given when there is satisfactory data and an agreed on, suitable reference oil if applicable.
E-34 Propulsion Lubricants Committee
An Assessment of the Influence of Gas Turbine Lubricant Thermal Oxidation Test Method Parameters Towards the Development of a New Engine Representative Laboratory Test Method2013-01-900412/20/2013
In the development of a more accurate laboratory scale method, the ability to replicate the thermal oxidative degradation mechanisms seen in gas turbine lubricants, is an essential requirement. This work describes an investigation into the influence of key reaction parameters and the equipment set up upon extent and mechanism of oil degradation. The air flow rate through the equipment was found to be critical to both degradation rate and extent of volatilization loss from the system. As these volatile species can participate in further reactions, it is important that the extent to which they are allowed to leave the test system is matched, where possible, to the conditions in the gas turbine. The presence of metal specimens was shown to have a small influence on the rate of degradation of the lubricant. Loss of metal from the copper and silver specimens due to the mild corrosive effect of the lubricant was seen. The Total Acid Number and viscosity of a series of oil samples from two service gas turbines are discussed. The ratio of these two physical properties was approximately constant between samples, indicating constant evaporation loss. Additionally, Gel Permeation Chromatography was used to compare the molecular weight distribution of a lubricant used in a gas turbine to laboratory samples. The replenishment of oil in service engines was highlighted as key difference between these samples. It is believed that laboratory methods can degrade oil similarly to service engines and therefore can be used to predict oil life and condition in service.
Spencer, Matthew, Shepherd, Timothy, Greenwood, Richard, Simmons, Mark
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