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Quality Assurance Sampling Plans
AAFES sampling plans are derived from
MIL-STD-105E or ANSI/ASQ Z 1.4, Sampling Procedures and Tables for Inspection by
Attributes. This standard is also known as ISO 2859-1, Sampling procedures for
inspection by attributes - part 1: Sampling schemes indexed by acceptance limit
(AQL) for loy-by-lot inspection.
AAFES sampling plans are designed to provide
maximum inspection productivity while maintaining a high degree of random
sampling reliability. Plans are provided for Acceptance Quality Levels (AQLs) of
2.5, 4.0, and 6.5 percent defective and are extracted from Inspection Levels I
and II of the above standards. The acceptance criteria for the smaller (of the
two) sample sizes in AAFES sampling plans are based on Level I, tightened
inspection, while acceptance criteria of the larger sample sizes are based on
Level II, normal inspection. The rejection criteria in all sample sizes of AAFES
sampling plans are the same as that of Level II, normal inspection.
An AQL of 2.5
Normal, 2.5 Tightened is used for all hardlines
merchandise.
AQLs of 4.0
Normal, 4.0 Tightened and 6.5
Normal, 6.5 Tightened are used for jewelry, shoes,
clothing, softside luggage and any cut & sewn item.
An AQL of 6.5
Normal, 6.5 Tightened is used for extra value, budget, or
entry price point type of merchandise.
What an AQL means is that as long as a supplier
maintains his/her process average (% defective) at the assigned AQL or lower,
there is a very high probability that shipments from that supplier, when
inspected using AAFES sampling plans, will be accepted. By the same token,
there is a very high probability that shipments, when inspected using AAFES
sampling plans, will be rejected if a supplier's process average (% defective)
remains higher than the assigned AQL.
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