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Test Method for the Determination of Water Concentration in Polyol Ester and Diester Aerospace Lubricants by Coulometric Karl Fischer Titration

2021-09-08
WIP
ARP5991A
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.
Standard

A Review of Literature on the Relationship Between Gas Turbine Engine Lubricants and Aircraft Cabin Air Quality

2021-03-25
WIP
AIR5784A
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 world. 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.
Standard

Evaluation of Thermal Stability and Corrosivity of Aviation Lubricants

2020-10-16
WIP
ARP6992
This test method describes a standardized process to evaluate the an aviation lubricant’s resistance to thermal degradation and to evaluate the fluid’s tendency to corrode a steel specimen. Fluids are evaluated in an environment free of both air and moisture at a specified temperature and time period
Standard

MPR Micropitting Test Method

2020-10-13
WIP
ARP6991
This method is a designed to evaluate the micropitting performance of currently available and future aviation turbine oil formulations. Drawing on previously performed tests documented in AIR 6989, the method comprises of 3 rings rotating against a rotating central roller configuration using the PCS Instruments Micropitting Rig (MPR). A test profile has been developed between industry and academia that relies on standard available test specimens.
Standard

Test Method for the Determination of Total Acidity in Polyol Ester and Diester Gas Turbine Lubricants by Automatic Potentiometric Titration

2020-09-02
WIP
ARP5088C
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.
Standard

Evaluation of Coking Propensity of Aviation Lubricants Using the Single Phase Flow Technique

2020-09-02
WIP
ARP5996D
This method is designed to evaluate the coking propensity of synthetic ester-based aviation lubricants under single phase flow conditions found in certain parts of gas turbine engines, for instance in bearing feed tubes. This method is applicable to lubricants with a coking propensity, as determined by this method, falling in the range 0.01 to 5.00 mg.
Standard

Evaluation of Corrosiveness and Oxidation Stability of Aviation Lubricant

2020-08-28
WIP
ARP6839
This test method describes a standardized process to evaluate the an aviation lubricant’s resistance to oxidation and corrosion-based degradation and to evaluate the fluid’s tendency to corrode various metals. Fluids are evaluated under a low-moisture atmosphere at a variety of times and temperatures.
Standard

Pressure-Viscosity Coefficient Measurement

2020-06-15
CURRENT
ARP6157A
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.
Standard

Assessment of Elastomer Volume Swelling Behavior in Aero-Derived Gas Turbine Engine Lubricants - Short Duration Test

2020-02-20
CURRENT
ARP7355
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.
Standard

Key Lubricant Performance Properties for Advanced Aircraft Engines

2019-12-04
WIP
AIR7448
The scope of this document is limited to the lubrication system of a conceptual high performance aircraft turbine engine. This document will not present or disclose any specific design data leading to the specific formulation of an advance engine lubricant or that of an advanced engine. General trends are presented based upon current literature and observations of lubricant/engine experience.
Standard

Acid Assay of Polyol Ester Lubricants

2019-09-11
WIP
ARP6670
This test method describes the procedure for the determination of the composition of the base stock of polyol ester lubricants by gas chromatography mass spectroscopy (GC-MS).
Standard

Compatibility of Turbine Lubricating Oils

2019-07-16
WIP
ARP7120
This method is used for determining the compatibility of a candidate lubricant with specific reference lubricants. The reference lubricants will typically be mandated by the product specification against which the candidate lubricant is being compared. This method is based on Federal Standard 791 method 3403 and Defence Standard 05-50 (Part 61) method 24, incorporating the modifications called for in SAE AS5780.
Standard

Evaluation of Coking Propensity of Aviation Lubricants in an Air-Oil Mist Environment using the Vapor Phase Coker

2019-07-08
WIP
ARP5921A
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.
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