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4.6 MIL-STD-105D AND ANSI/ASQC Z1.4-1981

******** ADD MORE ABOUT ANSI STANDARDS ABOVE

•Began development 1942

•A set of tables for single, double and multiple inspections.

•These tables are designed to favor producers risk.

•Three types of inspection levels,

(III)Tightened - for new suppliers, or suppliers with poor quality history

(II)Normal - for poor quality history

(I)Reduced - for suppliers with a good quality history

•AQL (Acceptable Quality Level) - chosen by experience and requirement

e.g.

critical components approx. 0.1% major components approx. 1% minor components approx. 2.5%

1. Sample size code can be found on table (pg. 329) using lot size and inspection level.

2.Using AQL, and sample size code, find the appropriate sample plan table, and look up the values. (plan varies by single, double, multiple sampling)

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include mil-std plans here

-see page 336 for a multiple sampling plan.

3.Start at normal inspection level, then tighten or loosen as required.