MIL-DTL-70438A(AR)
6.8 Tool Control. Where destruction of components is
necessary to inspect these dimensions, measurements of the tool
may be substituted provided that the contractor has established a
correlation between the tool dimensions and the components
dimensions prior to the start of production. The contractor
should be responsible for maintaining adequate surveillance to
assure the drawing requirements are being met throughout the life
of the tools.
6.9 Alternative testing procedures. Alternative testing
procedures may be used by the contractor when such testing and
procedures provide as a minimum the quality assurance provisions
specified herein. Prior to applying the alternative procedures,
the contractor should describe them in a written proposal and
should demonstrate for the approval of the responsible Government
technical agency that their effectiveness is equal to, or better
that the quality assurance provisions specified herein.
6.10 Dimensional control of cast or automatic tool parts.
In place of the normal sampling associated with the
classification of defects, and subject to the approval of the
government procuring agency, the optional sampling plans in
paragraphs 6.10.1 and 6.10.2 may be used for dimensional control
of cast or automatic tool parts. Use of these optional plans is
limited to those dimensions and features controlled by the tool,
die or mold cavity. For all specified test, visual examinations,
and examinations of dimensions or features not developed
exclusively by the tool, die or mold cavity, these optional plans
are not applicable. In the event of in-process reject(s) during
optional sampling, corrective action applicable to parts produced
prior to the rejected, and subsequent to the last acceptable
sample, should require approval of the government procuring
agency.
6.10.1 Cast parts. A sample of at least five parts (as
cast) from each cavity should be dimensionally inspected to
qualify a new or reworked cavity for use in production or as a
control of the cavity during production. Inspection for control
of each cavity during production should be performed on the above
quantities from each cavity after the production of 5000 parts.
Individual cavity identification must be provided. If any
defective parts are found during the qualification of the cavity,
the cavity producing the defective parts should not be used in
production. If any defective parts are found when inspection is
performed for control of the cavity, the cavity producing the
defective part should be removed from production. Further, that
portion of production since the last control check should be
returned for corrective action. All cavities formerly removed
from production because of some fault, may, after reworking, be
returned to production providing they pass the qualification test
specified above.
6.10.2 Automatic tool parts (see 6.11.b). A sample of at
least 10 parts should be dimensionally inspected to qualify a new
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