AQL Inspection Manual
Single Sampling Plan
Find the Sample Size Code Letter
Set the range covering the Batch or Lot Size being inspected in the window at the top right corner of the AQL Inspector's Rule. Then read the Sample Size Code Letter, in the box, directly to the left of the Inspection Level.
Find the Sampling Plan
The Sampling Plan consists of Acceptance Number, Rejection Number and Sample Size. Normal inspection is used until such time as the results of inspection dictate the Tightened or Reduced inspection should be employed as outlined in Switching Procedures on page 10. Single sampling plans are found on the front of the AQL Inspector's Rule.
Set the required AQL level in the window above the Single Sampling Plans. Locate the Sample Size Code Letter previously selected in step 1. If an arrow show in the window directly below the Code Letter, follow the direction of the arrow until a set of acceptance-rejection numbers are reached. Then read the Acceptance (black) and Rejection (orange) Numbers in the window and the Sample Size directly below.
The Acceptance and Rejection number pair and the Sample Size directly below them make up the Sample Plan.
Perform the Inspection
Randomly select a group of "Sample Size" items from the lot and inspect them. If the sample size equals or exceeds the lot size do 100% inspection. If the number of defective items is equal to or less than the Acceptance Number accept the lot. If the number of defective items is equal to or greater than the Rejection Number reject the lot.