MIL-DTL-28788C
TABLE I. Materials inspection.
Requirement
Applicable
Material
Paragraph
Specification
Fungus resistance
Plastic
Rubber
Ceramic
4.5 Qualification inspection. Qualification inspection shall be performed at a laboratory acceptable
to the Government (see 6.2) on sample units produced with equipment and procedures normally used in
production.
4.5.1 Sample size. The number of switches to be subjected to qualification inspection shall be as
4.5.2 Inspection routine. The sample shall be subjected to the inspections specified in table II, in
the order shown. All sample units shall be subjected to the inspections of group I. The sample shall then
be divided as specified in table II for groups II through V inclusive, and subjected to the inspection for
their particular group.
4.5.3 Failures. One or more failures shall be cause for refusal to grant qualification approval.
4.5.4 Extent of qualification.
4.5.4.1 Single submission. Qualification shall be restricted to the switch submitted.
4.5.4.2 Group submission. The extent of qualification shall be in accordance with the applicable
specification sheet (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 of inspection lots that passed and the number that failed (including 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 certification of compliance shall result in loss of qualification.
If the summary of 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. Differential pressure, insulation resistance, and dielectric withstanding
voltage shall be within the limits specified. Actual values need not be recorded.
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