MIL-DTL-62420B(AT)
3. REQUIRMENTS
3.1 First article. When specified (see 6.2), a sample shall be subjected to first article
inspection in accordance with 4.3.
3.2 Materials. Materials shall be as specified herein, in applicable standards and
specifications and on applicable drawings (see 4.5.1).
3.2.1 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.
3.2.2 Hazardous materials. Asbestos, Cadmium, and radioactive material will not be used
in this item. Radioactive material is defined by CFR, Title 10, Parts 30 and 40, and other
radioactive material in which the radioactivity is greater than 0.002 microcuries per gram or
0.01 microcuries total activity for the item.
3.2.3 Dissimilar metals. Contact between dissimilar metals which encourages galvanic
action shall be avoided.
3.3 Design and construction. The laser protected tank periscopes shall be manufactured
in accordance with the applicable drawing to the periscope specified (see 6.2) and all drawings
pertaining thereto from the following (see 4.5.1):
12357792
12357850
12357794
12357908
12357840
12357909
12357841
12357918
12357846
12370033
12357848
12370322
12370393
3.4 Operating requirements. Each control unit shall provide the following functional,
operational, and performance capabilities.
3.4.1 Optical characteristics.
3.4.1.1 Resolution. The periscope shall permit resolution of a test pattern subtending one
(1) minute of arc within the resolving area as specified in the applicable drawing listed in 3.3.
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