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Chapter 16: C. Inspection Planning and Procedures 179
Table 16.1 Standards pertaining to material review board operations.
Standard
MIL-STD-1520C
MIL-Q-9858A
MIL-STD-481B
MIL-I-8500
ANSI/ASQ Z1.4-2003
ANSI/ASQ Z1.9-2003
Purpose
Sets “the requirements for cost-effective corrective action and
disposition system for nonconforming material”
Quality program requirements, Section 6.5, Nonconforming
Material, requires the contractor to establish “an effective and
positive system for controlling nonconforming material”
Configuration control—engineering changes
Establishes interchangeability and replaceability requirements
Sampling procedures and tables for inspection by attributes
Sampling procedures and tables for inspection by variables for
percent nonconforming
Within the context of defect classification, defects may further be classified
as major or minor. Minor defects, unlike major ones, may not adversely affect the
integrity of the part, component, or assembly. In many cases, the MRB concludes
that the lot containing nonconforming products should not be shipped as is.
The final decision, concurred with by inspection personnel, may be to sort
(100 percent inspection), downgrade, repair, rework, or scrap. A decision to ship also
may be authorized by the MRB. In such cases, a unanimous decision should be
reached by all members. The decision also should create factual data and thus
an important source of information. A successful MRB program requires that the
board not only make decisions about immediate disposition of rejected material,
but also direct ongoing programs of root cause analysis to eliminate future rejections
of the same type.
There are several military documents associated with the MRB concept. A
partial list is shown in Table 16.1.
Part III.C.6