DPSCM 4155.18
I. REFERENCES.
A. $(SK) MILSTD105, Sampling Procedures and Tables for
Inspection by Attributes.
B. MILSTD109, Quality Assurance Terms and Definitions.
C. MILHDBK53, Guide for Sampling Inspection.
D. DPSC Manual 4155.5, Subsistence Contractor Inspection
Procedures Manual.
E. DPSC Manual 4155.6, Subsistence Inspection Manual.
II. PURPOSE AND SCOPE. The purpose of this Manual is to provide
information regarding statistical sampling plans. This Manual is
applicable to Government personnel performing inspection on DPSC
subsistence contracts and may be used in briefing contractor's
personnel on contractor inspection procedures.
III. DEFINITIONS.
A. Major Total Defects Concept. This calls for assignment of
separate Acceptable Quality Levels (AQLs) for each major class of
defects and an AQL for the combined major and minor classes of
defects. An AQL is not assigned to the minor class of defects,
but the sampling plan for total defects pertains to the total of
major defects plus minor defects found in the sample.
To standardize procedures and minimize confusion in using
MILSTD105 to obtain a sampling plan (i.e. sample size, acceptance
and rejection numbers) when a Table of Examination has more than
one class of defects (e.g. major, minor, total) and a combination
of AQLs, the inspector should follow the instructions in the
applicable table of MILSTD105 to arrive at one sample size, with
corresponding acceptance and rejection numbers, to be used for all
classes of defects in the examination. When there are compelling
reasons to use separate sample sizes for the different classes of
defects, approval will be obtained from the quality assurance
element of the contracting activity.
B. Major-Minor Defects Concept. Such plans require separate
AQLs for each class of defects, i.e., major and minor. This makes
it possible for the sample size to vary for each class of defects.
However, to minimize confusion and to facilitate application, it
is preferable that the sample size be the same for all classes of
defects in an examination, as for the major-total defects concept.
This concept is currently being stressed in Military and Federal
specifications more than the major total defects concept.