Question

a)Using MIL STD 105E, find the sample size for inspection level III, normal inspection, AQL = 1.5%, and lot size of 1000. Determine the sample size.

b)For inspection level I, tightened inspection, AQL = 6.5%, and lot size = 500, find the sample size using MIL STD 105E.

Answer 1

Standard MIL STD 105E AQL TABLE-For Question A- Lot Size= 1000 & Normal Inspection Level 3,

AQL= 1.5%

Code Letter for 1000 lot size is " K ".

For Question B- Lot Size= 500 & Tightned Inspection of Level 1,

AQL =6.5%

Code Letter for 500 lot size is " F ".

For Question A-

Locate Code letter " K ", and besides that, you will find the sample size = 125. (Ans)

Also at AQL=1.5%,

AC- 5, RE- 6

SO, lot is accepted if rejected part are less than or equal to 5 & lot is rejected if failed parts are equal or greater than 6.

For Question B- Inspection Level 1 (Tightned Inspection)

Above table is for Tightned Inspection.

If 2 lot are rejected in a row, than the inspection becomes Tightned, rather than Normal.

Locate Code letter " F ", AQL=6.5%

SAMPLE SIZE= 20.

Lot accepted if rejected parts are equal or lesser than 2.

Lot rejected if rejected parts are equal or greater than 3.