DEFSTAN 05-71(PT2)/1(2006) : 2006

Foreword
Introduction
1 Scope
   1.1 Coverage
   1.2 Objective
   1.3 Lot quality
2 Warning
3 Field of Application
4 Normative and Informative References
5 Definitions
   5.1 Acceptance Quality Limit (AQL)
   5.2 Switching Rules
   5.3 Inspection by Variables
   5.4 Acceptance Sampling by Variables
   5.5 Limiting Quality
   5.6 Reference Target
6 Symbols
7 Similarities to BS 6002-2
8 Acceptance Quality Limit (AQL)
   8.1 Use
   8.2 Specifying AQLs
   8.3 Preferred AQLS
   8.4 Caution
9 Switching Rules
   9.1 Tightened Inspection
   9.2 Discontinuation of Inspection
   9.3 Resumption of Inspection
   9.4 Reduced Inspection
   9.5 Details
10 Production Continuity and Operating Characteristic
   Curves
   10.1 Continuous Production
   10.2 Non-continuous Production
   10.3 Operating Characteristic Curves
11 Planning
12 Choice of Inspection Level and AQL
13 Choice of Sampling Scheme
   13.1 Schemes Contained In this Defence Standard
   13.2 Special Schemes
14 Preliminary Operations
15 Standard Procedure under Normal Inspection
   15.1 Obtaining a Plan
   15.2 Obtaining the sample Data
   15.3 Estimating the probability of Missing the Reference
        Target at the Reference Range
        15.3.1 Choice of Method
        15.3.2 Computer method
        15.3.3 Exact tabular method using tables of the
               incomplete beta function
        15.3.4 Approximate tabular method using tables of
               the standard normal distribution function
   15.4 Determining Lot Acceptability
16 Procedure whilst Continuing Inspection
17 Detection and Accommodation of Outliers
   17.1 Detection of Outliers
   17.2 Accommodation of Outliers
18 Records
   18.1 Control Charts
   18.2 Records of p
   18.3 Lots that are Not Accepted
19 Operations of Switching Rules
   19.1 Original Inspection
   19.2 Start of Inspection
   19.3 Normal Inspection to Tightened Inspection
   19.4 Tightened Inspection to Normal Inspection
   19.5 Normal Inspection to Reduced Inspection
   19.6 Reduced Inspection to Normal Inspection
20 Discontinuation and Resumption of Inspection
21 Operating Characteristic Curves for Tightened and
   Reduced Inspection
Chart A - Sample Size Code Letters of Standard Single
          Sampling Plans for Specified Qualities at 95%
          and 10% Probabilities of Acceptance under Normal
          Inspection
Charts B.1 to Q.1 - Operating Characteristic Curves and Tables
Annex A - Table for Determining the Sample Size Code Letter
Annex B - Form p* Single Sampling Plans
Annex C - Values of f[s] for Maximum Sample Standard
          Deviation (MSSD)
Annex D - Producer's Risks
Annex E - Consumer's Risk Qualities
Annex F - Estimating the process Quality Level
   F.1 General
   F.2 Symbols
   F.3 Exact general formulae for estimating p
   F.4 Simplified exact formulae for p[L], p[R], p[B] and
        p[T] when n = 3
   F.5 Simplified exact formulae for p[L], p[R], p[B] and
        p[T] when n = 4
   F.6 Approximation to p when n>= 5
Annex G - Outlier Test
   G.1 General
   G.2 Further notation
   G.3 Test procedure
Annex H - Statistical Theory for Accuracy Proof
   H.1 Symbols
   H.2 The Normal Distribution
   H.3 The Process Fraction of Nonconforming Projectiles
   H.4 The Symmetric Beta Distribution
   H.5 Acceptability Criteria
Annex I - Combining Accuracy Proof with Proof of other
          Independent Normally-Distributed Variables