MIL-PRF-49291D
4.6.4 Group C inspection. Group C inspection shall consist of the inspections specified in table IV.
Group C inspection shall be made on sample units selected from production lots which have passed the
groups A and B inspections.
4.6.4.1 Sampling plan. Three sample units shall be selected from those types covered by a single
specification sheet. Group C shall be conducted 60 months after the date of notification of qualification,
and every 60 months thereafter, except when the total production in a 60-month period is less than 11
units of product; inspection need not be made until production is at least 11 units of product.
4.6.4.2 Failures. If one or more sample units fail to pass group C inspection, the production unit shall
be considered to have failed.
4.6.4.3 Disposition of sample units. Sample units which have been subjected to group C inspection
shall not be delivered on the contract.
4.6.4.4 Noncompliance. If a sample fails to pass group C inspection, the supplier shall notify the
qualifying activity and the cognizant inspection activity and take corrective action on the materials or
processes, or both, as warranted. Acceptance of the product shall be discontinued until corrective action,
acceptable to the Government, has been taken. After the corrective action has been taken, group C
inspection shall be repeated on additional sample units (all inspections, or the inspection which the
original sample failed, at the option of the Government). Groups A and B inspections may be reinstituted;
however, final acceptance shall be withheld until the group C reinspection has shown that the corrective
action was successful. In the event of failure after reinspection, information concerning the failure and
corrective action taken shall be furnished to the cognizant inspection activity and the qualifying activity.
TABLE IV. Group C inspection.
Requirement
Test
Inspection
Applicable test document
paragraph
paragraph
Subgroup I
Macrobend attenuation
Storage temperature
Temperature humidity cycling
Measurement 3302
Temperature cycling
Measurement 3301
Life aging
Measurement 3303
Subgroup II
Mechanical strippability
Fluid immersion aging
Dynamic tensile strength
1/
Subgroup III
Thermal vacuum outgassing
Odor
Toxicity
1/ These tests may be waived by the qualifying activity.
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