This metric SAE Aerospace Information Report (AIR) details a ball-on-cylinder (BOC) test device and specifies a method of rating the relative lubricity of aviation turbine fuel samples. The BOC produces a wear scar on a stationary steel ball by forcing it with a fixed load against a fuel wetted steel test ring in a controlled atmosphere. The test ring is rotated at a fixed speed so its surface is wetted by a momentary exposure to the fluid under test. The size of the wear scar is a measure of the test fluid lubricity and provides a basis for predicting friction or wear problems.
The document is being stabilized with a statement recommending the use of the corresponding ASTM D5001 Ball-on-Cylinder Lubricity Evaluator (BOCLE) standard for evaluating the lubricity of turbine fuels since it is felt that this standard is more contemporary and widely used in the industry. It includes editorial changes to Section 2.