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Aviation Lubricant Tribology Evaluator (ALTE) Method to Determine the Lubricating Capability of Gas Turbine Lubricants
- Aerospace Standard
- ARP6255
- Issued
Downloadable datasets available
Annotation ability available
Sector:
Issuing Committee:
Language:
English
Scope
Employing ‘ball-on-cylinder’ philosophy, a non-rotating steel ball is held in a vertically mounted chuck and using an applied load is forced against an axially mounted steel cylinder. The test cylinder is rotated at a fixed speed while being partially immersed in a lubricant reservoir. This maintains the cylinder in a wet condition and continuously transports a lubricating film of test fluid to the ball and cylinder 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; mild and severe wear, the ALTE therefore has the ability to assess a lubricant’s performance in that regard. These mechanisms are described below.
Rationale
The Aviation Lubricant Tribology Evaluator (ALTE) is a device designed to assess the relative lubricating performance of aviation turbine oils. The aim of the ALTE is to produce test conditions which allow lubricants to be evaluated on a laboratory scale, in a timely manner without deviating greatly from representative wear mechanisms.
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Data Sets - Support Documents
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Issuing Committee
E-34 Propulsion Lubricants Committee
This committee encompasses lubricants for gas turbine engines, as well as aircraft gear boxes and accessories. In addition, the work of the committee encompasses lubricants for privately owned jet or turbo propeller engines that operate on synthetic lubricants.
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