MIL-PRF-11021H
2.4 Order of precedence. In the event of a conflict between the text of this document and
the references cited herein, the text of this document takes precedence. Nothing in this
document, however, supersedes applicable laws and regulations unless a specific exemption has
been obtained.
3. REQUIREMENTS
3.1 First article. Unless otherwise specified (see 6.2), the contractor shall furnish
vehicular switch assemblies, which shall be subjected to first article inspection (see 4 and 6).
First article inspection samples, properly marked with identifying information shall be
representative of the units to be furnished to the Government. All subsequent switch assemblies
delivered to the Government shall conform to these samples in all of their pertinent physical and
performance attributes.
3.2 Materials. Materials shall be as specified herein and on applicable referenced
standards, drawings, or specifications. Materials shall be uniform and free from imperfections or
defects, which adversely affect performance or serviceability of the finish products. All non-
metallic materials shall be inherently fungus resistant or treated to resist fungus growth. All
metallic parts shall be made from corrosion resistant steels or treated with corrosion-resistant
materials. Materials shall be suitable for a switch operating in an ambient temperature range
from -65°F to 180°F (-53.9°C to +82.2°C). Asbestos and cadmium materials shall not be used in
any form in any part of the switch. No item, part, or assembly shall contain radioactive materials
in which the specific activity is greater than 0.002 microcuries per gram or activity per item
equals or exceeds 0.01 microcuries (see 4.1.2).
3.2.1 Dissimilar metals. Separation of dissimilar metals shall be done by insulation
between mating surfaces. Except where necessary to complete an electrical circuit, contact
between dissimilar metals that would encourage galvanic action shall be avoided (see 4.1.2).
3.2.2 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 (6.3.3).
3.2.3 Process requirements. If the following processes are used to fabricate the switch,
conformance to the cited specifications is required.
3.2.3.1 Solder. Solder shall meet the applicable electrical and electronic device solder
requirements of ASTM B32 (see 4.1.2).
3.2.3.2 Cast parts. Cast parts shall conform to composition of SAE AMS4235 (see
4.1.2).
3.3 Design and construction. Design and construction shall conform to all of the
applicable requirements, standards, and drawings herein that include operational, environmental,
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