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Example 3 - Differences between ANSI and ISO versions

Reduced inspection is in use, AQL is 1.0, the batch size is 125, single inspection and the inspection level is III. What is the sampling plan?

 

ANSI version of AQL Inspector's Rule

  1. Set the batch size (91 to 150) is the upper window

  2. Look next to the Inspection Level III to find the Code Letter of G.

  3. Next set the AQL window to 1.0

  4. Looking under Code Letter G in Reduced Inspection we find an arrow directing us to Code Letter H.

  5. Under Code Letter H we find a sample size of 20, an acceptance number of 0 and a rejection number of 2.

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

  7. If the defect count is 2 or more reject the batch and return to the normal inspection for the next batch.

  8. If the defect count is between the accept and reject numbers (1) accept the batch and return to the normal inspection for the next batch.

ISO version of AQL Inspector's Rule

  1. Set the batch size (91 to 150) is the upper window

  2. Look next to the Inspection Level III to find the Code Letter of G.

  3. Next set the AQL window to 1.0, looking under Code Letter G in Reduced Inspection we find arrows directing us to Code Letter H then J.

  4. Under Code Letter J we find a sample size of 32, an acceptance number of 1 and a rejection number of 2.

  5. If the defect count is 1 or less accept the batch.

  6. If the defect count is 2 or more reject the batch and return to the normal inspection for the next batch.