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SAE ARP5921 Rev A

Evaluation of Coking Propensity of Aviation Lubricants in an Air-Oil Mist Environment Using the Vapor Phase Coker
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SAE ARP5921 Rev A

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

PUBLISH DATE 2026
SAE ARP5921 Rev A
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 to 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.
SDO SAE: SAE International
Document Number ARP5921
Publication Date March 13, 2026
Language en - English
Page Count
Revision Level A
Supercedes
Committee
Publish Date Document Id Type View
March 13, 2026 ARP5921A Revision
April 3, 2014 ARP5921 Revision