MIL-PRF-49462C
TABLE IX. Group C inspection.
Inspection
Requirement
Method
Number of
Paragraph
paragraph
samples
Monthly 1/
Thermal shock
Low temperature operation
10
Terminal strength
Quarterly
Subgroup I
Dielectric withstanding voltage
Insulation resistance
Thermal shock
10
Moisture resistance
Quarterly
Subgroup II
10
Life
Semiannual 1/
Shock (specific pulse)
Vibration, high frequency
10
1/ If the manufacturer can demonstrate that these tests have been performed
for five consecutive times with zero failures, these tests, with the approval of
the qualifying activity, can be deleted. The manufacturer however, shall
perform these tests every three years after the deletion as part of long term
design verification. If the design, material, construction, or processing of the
part is changed, or if there are any problems, or failures, the qualifying
activity may require resumption of the original test frequency.
4.7.1.1.3 Semiannually. Every 6 months, 10 sample units of each style, characteristic, and body
enclosure of any resistance value between the critical and highest resistance values shall be inspected
with one defective unit allowed.
4.7.1.1.4 Defectives. If the number of defectives exceed the number allowed in 4.7.1.1.3, the sample
shall be considered to have failed.
4.7.1.1.5 Disposition of samples. Sample units which have been subjected to group C inspection shall
not be delivered on the contract or purchase order.
4.7.1.1.6 Noncompliance. If a sample fails to pass group C inspection, the manufacturer shall notify
the qualifying activity and cognizant inspection activity of such a failure and take corrective action on the
materials or processes, or both, as warranted, and on all units of product which can be corrected and
which are manufactured under essentially the same conditions, with the same materials and processes,
and which are considered subjected to the same failure. Acceptance and shipment of the product shall
be discontinued until corrective action acceptable to the qualifying activity has been taken. After
corrective action has been taken, group C inspection shall be repeated on additional sample units (all
tests and examinations, or the test which the original sample failed, at the option of the qualifying activity).
Group A and group B inspections may be reinstituted; however, final acceptance and shipment shall be
withheld until the group C inspection has shown that the corrective action was successful. In the event of
failure after reinspection, information concerning the failure shall be furnished to the cognizant inspection
activity.
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