Q 

Normal inspection is in use, the batch size is 1000, AQL is 1.5, single inspection and the inspection level is II. What is the sampling plan?

A 

1. Set the batch size (501 to 1200) in the upper window

2. Look next to the Inspection Level II to find the Code Letter of J.

3. Next set the AQL window to 1.5,

4. Looking under Code Letter J in Normal Inspection we find a sample size of 80, an acceptance number of 3 and a rejection number of 4.

5. If the defect count is 3 or less accept the batch.

6. If the defect count is 4 or more reject the batch.

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.

Q 

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?

A 

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.

Q 

Tightened inspection is in use, AQL is 10, the batch size is 2000, double inspection and the inspection level is II. What is the double sampling plan?

A 

1. Set the batch size (1201 to 3200) in the upper window

2. Look next to the Inspection Level II to find Code Letter K.

3. Next turn over the AQL Inspector's Rule and set the AQL window to 10, looking under Code Letter K in Tightened inspection we find a first sample size of 80, with an acceptance number of 9 and a rejection number of 14.

4. If the number of defects is 9 or less accept the batch the inspection of the batch is complete.

5. If the number of defects is 14 or more reject the batch and inspection of the batch is complete.

6. If the defect count is between 9 and 14 (10 to 13) continue to the second inspection. Take second sample of 80 pieces.

7. Add the defects in found the first and second samples.

8. If the combined defect count is 23 or less accept the batch.

9. If the combined defect count is 24 or more reject the batch.