Acceptable Quality Levels (AQL) - What is the usage of AQL 100 to 1000?

In the sampling plan master tables there are AQLs ranging from 0.010 to 1000.
I wonder what is the usage of AQL 100 to 1000? Under what circumstances are they used?

[Marc]

Any Sampling Plan gurus out there?

I am not a guru but:
If you use percent deffective the AQL values are 0.01% to 10%.
If you use number of deffects per 100 units the AQL values are from 0.01 to 1000 defects

[Shasta Ell]

How can you have 1000 defects per 100 units? As in more than 100 defective per 100 units?

[Al Rosen]

Originally Posted by Shasta Ell

How can you have 1000 defects per 100 units? As in more than 100 defective per 100 units?

It is the number of defects not the number of defectives. Of course you can have more than one defect per unit.

[NormBlack]

Originally Posted by WLN

In the sampling plan master tables there are AQLs ranging from 0.010 to 1000.
I wonder what is the usage of AQL 100 to 1000? Under what circumstances are they used?

This is not a specific answer to you question since I have no clue why AQLs of above 4 (much less 100 and above) would be used.
I found an interesting site for plugging in desired AQLs to get sample size. I have not verified it's accuracy, but you might find it of interest. It is: http://www.sqconline.com/

Norman

[Govind]

Originally Posted by WLN

In the sampling plan master tables there are AQLs ranging from 0.010 to 1000.
I wonder what is the usage of AQL 100 to 1000? Under what circumstances are they used?

I got this same question from a student in SSBB class. “ How can AQL be greater than 100?” I am researching an appropriate answer.
Can some one from Cove provide an answer why?

Thanks,
Govind.

[Tim Folkerts]

As was pointed out earlier, a single "item" could have more than 1 defect. For example, the "item" might be a crate of apples. If it acceptable to have 2 bad apples in the crate, then AQL would be 200, i.e. two defects per item.

Or the "item" might be the paint job on an appliance. If you can live with 4 minor flaws in the paint, then the AQL would be 400.


Tim F