Tools › Quality › Control › Acceptance Sampling › Example
MIL-STD-105E (ANSI/ASQ Z1.4): lot of 2,000, inspection level II, AQL 1.0 → code K, n = 125, Ac 3 Re 4
| Tool | Acceptance Sampling |
| Source | U.S. Department of Defense (1989). Sampling Procedures and Tables for Inspection by Attributes. MIL-STD-105E, 10 May 1989. Tables I, II-A, II-B, II-C, III-A and X-K-1. |
| Level | Professional |
Problem
A lot of 2,000 units is to be inspected at general inspection level II against an AQL of 1.0 % nonconforming. Find the sample size code letter, the normal single sampling plan, the tightened and reduced plans, the double plan of Table III-A, and the OC values of the normal plan.
Inputs to Enter
- Z1.4 Lookup checked; lot size 2000, inspection level II, table AQL 1.0, severity normal, plan type single (loaded by default)
Answers
- Table I: lot range 1,201–3,200 at level II → code letter K
- Table II-A normal: n = 125, Ac 3, Re 4; Table II-B tightened: n = 125, Ac 2, Re 3; Table II-C reduced: n = 50, Ac 1, Re 4 (gap: accept but return to normal)
- Table III-A double: n1 = n2 = 80, Ac 1 Re 4 then Ac 4 Re 5
- Table X-K-1 (Poisson): Pa = 0.95 at 1.09 %, 0.50 at 2.94 %, 0.10 at 5.34 %; Table V-A AOQL factor 1.6 %
Notes
The default inputs are the standard's own example; press Submit. The tables were transcribed from the scanned standard; arrows are followed and the 100 % inspection rule applied where the sample would exceed the lot.