EXPLANATION
Aircraft turbine lubricants, upon standing at low temperatures for prolonged periods of time, may show an increase in kinematic viscosity. This increase may cause lubrication problems in aircraft engines. Thus, this test method is used to ensure that the kinematic viscosity does not exceed the maximum kinematic viscosity in certain specifications for aircraft turbine lubricants.
TEST SUMMARY
Kinematic viscosity is measured at low temperature in accordance with Test Method ASTM D445, and at time intervals of 3 and 72 h. This test was developed at -65° F, and has been used at -40° F. It may be used at other temperatures as agreed by the contracting parties.
TEST PRECISION
See the precision in the following figure.
The bias of this test method has not been established.