Example 2 - Arrows in the Ac-Re Box

Q 

Normal inspection is in use, the batch size is 20, AQL is 1.5, single inspection and the inspection level is I. What is the sampling plan?

A 

1. Set the batch size (16 to 25) in the upper window

2. Look next to the Inspection Level I to find the Code Letter of B.

3. Next set the AQL window to 1.5,

4. Looking under Code Letter B in Normal inspection we find an arrow. Following this arrow to C we find another arrow and continue to D.

5. Under code letter plan D in Normal Inspection we find a sample size of 8, an acceptance number of 0 and a rejection number of 1.

6. If the defect count is 0 accept the batch.

7. If the defect count is 1 or more reject the batch.