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Scope

1.1 This practice establishes tables and procedures for applying five different types of continuous sampling plans for inspection by attributes using MIL-STD-1235B as a basis for sampling a steady stream of lots indexed by AQL.

1.2 This practice provides the sampling plans of MIL-STD-1235B in ASTM format for use by ASTM committees and others. It recognizes the continuing usage of MIL-STD-1235B in industries supported by ASTM. Most of the original text in MIL-STD-1235B is preserved in Sections 6-10 of this practice.

1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

Significance and Use

The reason for preserving military sampling standards is that many organizations throughout the world still use these standards in their current form. MIL-STD-1235B is no longer supported by the U.S. Department of Defense as of the mid-1990s and is out of print, but does exist in the public domain. This practice represents a conversion of MIL-STD-1235B to an ASTM-supported standard.

This practice provides the tables and procedures for applying five different types of continuous sampling plans for inspection by attributes. These continuous sampling plans are discussed in Sections 6-10 of this practice and each section includes information on:

(a) Initiation of 100 % inspection in use.

(b) Requirements on when to switch to sampling inspection.

(c) Conditions warranting a return to 100 % inspection.

(d) When a change in Code Letter, if desired, can be made.

(e) What to do when the checking inspector finds a defect that was originally found conforming by the screening inspector(s), that is, ineffective screening.

(f) Situations where a defect is found before the switch to 100 % inspection causing excessive periods of 100 % inspection so action must be taken, that is, long periods of screening.

Section 6 (Section 2 in MIL-STD-1235B) describes specific procedures and applications of the CSP-1 sampling plansa single-level continuous sampling procedure which provides for alternating between sequences of 100 % inspection and sampling inspection.

Section 7 (Section 3 in MIL-STD-1235B) describes specific procedures and applications of the CSP-F sampling plansa variation of the CSP-1 plans in that CSP-F plans are applied to a relatively short run of product, thereby permitting smaller clearance numbers to be used.

Section 8 (Section 4 in MIL-STD-1235B) describes specific procedures and applications of the CSP-2 sampling plansa modification of CSP-1 in that 100 % inspection resumes only after a prescribed number of defect-free units separate any two defective sample units.

Section 9 (Section 5 in MIL-STD-1235B) describes specific procedures and applications of the CSP-T sampling plansa multi-level continuous sampling procedure which provides for reducing the sampling frequency upon demonstration of superior product quality.

Section 10 (Section 6 in MIL-STD-1235B) describes specific procedures and applications of the CSP-V sampling plansa single-level continuous sampling procedure which is an alternative to CSP-T in that these plans provide for reducing the clearance number in good quality situations where reduction of sampling frequency has no economic merit.

Keywords

AOQ; AOQL; AQL; checking inspection; clearance number; continuous sampling plan; CSP-1; CSP-2; CSP-F; CSP-T; CSP-V; inspection by attributes; screening; ICS Number Code 03.120.30 (Application of statistical methods)

To find similar documents by ASTM Volume:

14.02 (General Test Methods; Forensic Psychophysiology; Forensic Sciences; Terminology; Conformity Assessment; Statistical Methods; Nanotechnology; Forensic Engineering; Manufacture of Pharmaceutical Products)

To find similar documents by classification:

03.120.30 (Application of statistical methods)

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