MIL-DTL-9419G
4.5.2. Failure. Failure in any examinations or test shall be cause for refusal to grant qualification.
4.5.3. Retention of qualification. To retain qualification, the contractor shall forward after initial
qualification, at the conclusion of each succeeding 12 month period, a summary of the results of group A
test performed during that period, indicating as a minimum the number of lots which have passed and the
number which failed, and a summary of the group B test performed during that period. The contractor
shall forward for each 36 month interval the complete results of group C test which shall be performed
during the last 12 months of the interval. If the test results indicate nonconformance with specification
requirements, action shall be taken to remove the failing product from the qualified products list. Failure
to submit a report within 30 days after the end of each period may result in loss of qualification for the
product. In addition to the periodic submission of inspection data, the contractor shall immediately notify
the qualifying activity anytime during the applicable interval that the inspection data indicates failure of
product to meet the requirements of this specification. In the event that no production occurred during the
12 month reporting interval, a report shall be submitted certifying that the company still has the
capabilities and facilities necessary to produce the time. If the item has not been produced for 36
months, the product must be requalified.
4.6 Conformance inspections.
4.6.1 Inspection of product for delivery. Inspection of product for delivery shall consist of groups A and
B inspection. Delivery of products which have passed group A shall not be delayed pending the results of
group B inspection.
4.6.1.1 Group A inspection. Group A inspection shall consist of the inspections specified in table II.
An inspection lot shall consist of all switches of the same design and construction, produced under
essentially the same conditions, and offered for inspection at one time.
4.6.1.1.1 Sampling plan. Statistical sampling shall be in accordance with tables II and III. Separate,
randomly selected groups of samples are required for subgroups 1 and 2. For acceptance of the lot there
shall be zero occurrences of defects.
4.6.1.1.1.1 Subgroup 1. A sample of parts shall be randomly selected in accordance with table III,
subgroup 1 sampling plan.
4.6.1.1.1.2 Subgroup 2. A sample of parts shall be randomly selected in accordance with table III,
subgroup 2 sampling plan.
4.6.1.1.2 Rejected lots. If an inspection lot is rejected, the lot shall be 100 percent inspected for the
defects noted. The contractor may correct all of the defects or remove all of the defective units from the
lot. The lot shall then be sampled again in accordance with tables II and III. For acceptance, there shall
be zero occurrences of defects. Such lots shall be separate from new lots and shall be clearly identified
as reinspected lots.
4.6.1.2 Group B inspection. One switch shall be selected at random from each 1,000 switches
produced and shall be subjected to the normal endurance test (see 4.7.8.1).
4.6.1.2.1 Disposition of sample units. Sample units which have been subjected to group B shall not be
delivered on the contract or order.
4.6.1.2.2 Action in case of failure. The manufacturer shall immediately investigate the cause of failure
and take corrective action to insure that subsequent switches do not contain the same defects.
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