MIL-PRF-31031B
e. Process control: Records shall cover the implementation of devices such as control charts (e.g.,
X bar and R charts) or other means of indication of the degree of control achieved in the
production process. Records shall also indicate the action taken when each out of control
condition is observed, and the disposition of product not conforming to the manufacturers
established prescribed limits. Records associated with nonconforming products shall be held for a
minimum of 3 years. A formal SPC program in accordance with EIA-557 shall be established.
f. Self-audit requirements: Manufacturing flowcharts do not have to contain internal document
control numbers pertaining to each process performed and quality control station.
4.3.2 SPC. A SPC program shall be established and maintained in accordance with EIA-557.
Evidence of such compliance shall be verified by the qualifying activity as a prerequisite for qualification
and retention of qualification.
4.4 Qualification inspection. Qualification inspection shall be performed at a laboratory acceptable to
the Government (see 6.3) on sample units produced with equipment and procedures normally used in
production.
4.4.1 Sample size. Connectors of the same PIN with its mating connector, when applicable (see
1.1.2), shall be subjected to qualification inspection. The number of samples shall be as specified in
table I.
4.4.1.1 Sample size (contacts). Ten sets of pin and socket contacts shall be subjected to qualification
inspection.
4.4.2 Group qualification. For group qualification of all series of connectors covered by this
specification, see 3.1. The Government reserves the right to authorize performance of any or all
qualification inspection of additional types in the group that are considered necessary for qualification
within each group.
4.4.3 Inspection routine. The sample shall be subjected to the inspections specified in table I. All
sample units shall be subjected to the inspection of group I. The sample size shall be as specified in
table I. The sample units shall then be subjected to the inspection for their particular group and in the
sequence given for that group.
4.4.4 Failures. One or more failures shall be cause for refusal to grant qualification approval.
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