1) Operator did not ensured the Inner Diameter of the part to the drawing requirement.

|2) The operator did not calculated the Air gauge reading properly.|3) The Air gauge was set to Dia. 40.011mm and it has to be measured between -11Micron and +14Micron, but the operator calculated the air gauge reading as 40.00mm and +25Micron.|4) Inadequate knowledge on the measuring instrument.