MIL-DTL-13735G
4. VERIFICATION
4.1 Classification of inspection. The examination and testing of switches shall be classified as follows:
Qualification inspection (see 4.3).
a.
Conformance inspection (see 4.5).
b.
4.2 Test equipment and inspection facilities. Test and measuring equipment and inspection facilities of sufficient
accuracy, quality, and quantity to permit performance of the required inspection shall be established and maintained
by the contractor. The establishment and maintenance of a calibration system to control the accuracy of the
measuring and test equipment shall be in accordance with ANSI/NCSL Z540.1, ISO-10012-1, or equivalent system as
approved by the qualifying activity.
4.2.1 Additional inspection. Nothing specified herein shall preclude the supplier from taking such additional
samples and making such addition inspections as he may deem necessary or desirable to assure conformance of the
switches to this specification.
4.2.2 Government. Acceptance of the switches shall be based upon verification by the Government of the
supplier's compliance with the requirements of this specification. The Government may, as its option, repeat any or all
of the inspections specified herein.
4.3 Qualification inspection. For qualification inspection, the manufacturer shall furnish eight specimens of each
type, class and grade of switch. The sample specimens shall be representative of the units proposed to be furnished
to the Government. Qualification inspection shall be performed at a laboratory acceptable to the Government on
sample units produced with equipment and procedures normally used in production. Qualification inspection shall
consist of testing as specified in table I in the order listed.
4.3.1 Sample size. The number of switches to be subjected to qualification inspection shall be as specified in table
4.4 Failures. One or more failures shall be cause for refusal to grant qualification approval.
4.5 Verification of qualification.
a. Design of switch has not been modified (every 12 months).
b. Verification of group A lot acceptance (every 12 months) (see 4.6)
c. Periodic group B inspection (every 36 months) (see 4.7)
4.6 Conformance inspection. Conformance inspection of product for delivery shall consist of group A inspection.
4.6.1 Inspection lot. An inspection lot shall consist of switches of the same specification sheet produced under
essentially the same conditions, and offered for inspection at one time. Similar switches conforming to these
requirements but having different circuitry may be combined to form a lot.
4.6.2 Group A inspection. Group A inspection shall consist of the inspections specified in table II.
4.6.2.1 Sample size. Statistical sampling shall be in accordance with table III. For acceptance there shall be zero
occurrences of defects.
4.6.2.2 Rejected lots. If an inspection lot is rejected, the lot shall be 100 percent inspected for the defects noted.
The contractor may correct the defects or remove the defective units from the lot. The lot shall then be sampled
again in accordance with table III. For acceptance, there shall be zero occurrences of defects. If there are one or
more defects in this second sample for the same characteristic that caused the original lot rejection, the lot is rejected.
Such lots shall be separate from new lots and shall be clearly identified as reinspected lots.
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