A particular component is used in large quantities in an ass

A particular component is used in large quantities in an assembly. It costs very little, but some protection
against defective components is needed as they can be easily detected only after they have been built-in
to an expensive assembly, which is then scrap if it contains a defective component. 100% inspection of
the components is not possible as testing at the component level would be destructive, but the idea of
acceptance sampling is attractive.
a How would you decide on the AQL to use?
b If the AQL was 0.4% defective and these components were supplied in batches of 2500, what
sampling plan would you select from Table 15.1? (Batches of 2500 require sample size code K for
general inspection, level II.)

c What would you do if you detected a single defective component in the sample?
d What would you do if this plan caused a batch to be rejected?

Solution

Use of AQL if AQL cost << (ratio unit inspection cost/total cost of defective item)

b)

Plan 125(1/2)

c)

The batch can be accepted & the defective component shall be returned to the manufacturer

d)

All components must be returned the manufacturer, in special cases when the items are needed urgently, 100% inspection can be performed & passed items can be used