LTMS TF SS May 11, 2010
235 data entries ◦ 160 chartable tests Five test laboratories (A, B, D, F, G) ◦ 35 test stands 2 stands only had one ref test These stands were not included in this analysis Reference oil timeframe: 1/18/09 – 4/7/10
3 Stand Based Severity Adjustment System “Old system” used continuous SA Primary Parameters ◦ FEI1, % ◦ FEI2, % Set = 0.3 (same as the ‘old’ system) Assumed pass limit based on xW-20 viscosity grades ◦ FEI1=1.4, FEI2=1.2 ◦ Set Shewhart limits to ±2.0