MIL-DTL-28827C
TABLE II Qualification inspection Continued.
Requirement
Method
Examination or test
paragraph
paragraph
Group V (all sample units from groups III and IV)
Visual and mechanical examination
3.25 and 3.26
Calibration
Proof temperature
Time constant
Proof pressure (when specified)
Seal
Dielectric withstanding voltage
Insulation resistance
Contact resistance
1/ Three sample units only.
2/ Three sample units of the lowest temperature setting for which qualification is
sought and three sample units of the highest setting for which qualification is
sought (see 3.1).
4.5.5 Retention of qualification. To retain qualification, the contractor shall submit a summary of the
results of the tests performed for inspection of product for delivery (group A) and a certification of
compliance at yearly intervals via the Government quality assurance representative. The summary of
group A shall indicate the number and type of failures together with corrective action taken to correct
failures. The certification of compliance shall include verification that materials, processes, and quality
control have not changed. Failure to submit the group A summary and the test results indicates
nonconformance with the specification requirements, and corrective action acceptable to the qualifying
activity has not been taken, action may be taken to remove the failing product from the qualified products
list.
4.6 Conformance inspection.
4.6.1 Inspection of product for delivery. Inspection of product for delivery shall consist of group A
inspection.
4.6.1.1 Inspection lot. An inspection lot shall consist of all switches of the same type produced under
essentially the same conditions, and offered for inspection at one time.
4.6.1.2 Group A inspection. Group A inspection shall consist of the examinations and tests specified in
table III, in the order shown.
4.6.1.2.1 Sampling plan. Statistical sampling shall be in accordance with table IV. A randomly selected
group(s) of samples is required. For acceptance of the lot, there shall be zero occurrences of defects.
4.6.1.2.2 Rejected lots. If an inspection lot is rejected, the supplier may rework it to correct the defects,
or screen out the defective units, and resubmit for reinspection. Resubmitted lots shall be inspected
using tightened inspection. Such lots shall be separate from new lots, and shall be clearly identified as
reinspected lots.
4.6.1.2.3 Disposition of sample units. Sample units which have passed all the group A inspection may
be delivered on the contract or purchase order, if the lot is accepted and the sample units are still within
specified electrical tolerance.
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