PCS-MPR micropitting test method

Scope:

This method is currently under development in the E-34C Lubricating Characteristics subcommittee as a technique to predict the micropitting performance of 5 cSt turbine oils. The PCS Instruments Micro pitting rig (MPR) is currently used by the Industry to look at both macro and micro pitting resistance of lubricating oils on gears and bearings. Using the test methods and profile developed from testing performed by Powertrib, and then further discussions between PCS Instruments (the instrument manufacturer) and the E-34C committee, a set of proposed test conditions have been agreed. Once the specimens have been manufactured, a small round robin is planned to look at repeatability and reproducibility.

Rationale:

AS5780 does not specify a test method for evaluating micro pitting damage to bearings with different aviation oils – which has been reported to cause problems in aviation turbines. Therefore, this test method has been developed to address the micropitting performance of turbine oils. The intent is that this test will help to differentiate between existing aviation oils for micro pitting resistance and then in the future will help show that new oil formulations are at least as good as the existing oils for micro pitting resistance.

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