MIL-DTL-15291G
3.8 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or
environmentally preferable materials should be used to the maximum extent possible provided that the
material meets or exceeds the operational and maintenance requirements, and promotes economically
advantageous life cycle costs.
4. VERIFICATION
4.1 Classification of inspections. The inspection requirements specified herein are classified as
follows:
a. Qualification inspection (see 4.3).
b. Conformance inspection (see 4.4).
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 NCSL
Z540.3, ISO-10012, or equivalent system as approved by the qualifying activity.
4.3 Qualification inspection. 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 shall consist of the examination and tests specified in tables II and III
4.3.1 Samples for qualification. Sample switches of each class for which qualification is sought shall
be subjected to the tests specified in tables II and III, in the order shown. The SRN class is considered a
distinct class, however when qualifying both the class 1SR and class 1SRN reduced testing of the 1SRN
is permitted (see table III)
4.3.2 Verification of qualification. Every 12 months, the manufacturer shall provide verification of
qualification to the qualifying activity. Continuation is based on meeting the following requirements:
a. Design of switch has not been modified (every 12 months).
b. Verification of group A lot acceptance (every 12 months) (see 4.4.3).
c. Periodic group B inspection (every 24 months) (see 4.4.4).
4.3.3 Qualification inspection requirements for switches not covered by specification sheets.
Qualification inspection requirements for switches not covered by specification sheets shall be performed
by the contractor after award of contract and prior to production. Unless otherwise specified (see 6.2),
inspection shall be as specified in 4.3.
4.3.3.1 Samples. Unless otherwise specified (see 6.2), the samples and test routine shall be as
specified in 4.3.1 and table II or III. This acceptance is valid only on the contract under which it is granted
unless extended by the Government to another contract. Samples subjected to this inspection shall not
be delivered on the contract or order.
4.3.3.2 Failures. One or more failures will be cause for refusal to grant inspection acceptance.
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