MIL-DTL-27188C
3.2 Material.
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 Non-magnetic materials. Non-magnetic materials shall be used for all parts of the
indicator, except where magnetic materials are essential.
3.2.3 Non-ferrous materials. Non-ferrous materials shall be used for all parts of the
indicator, except where ferrous materials are essential.
3.2.4 Metals. Metals shall be corrosion-resistant or suitably treated to resist corrosion
due to fuels, salt fog, or atmospheric conditions likely to be met in storage or normal service.
3.2.5 Dissimilar metals. Unless suitably protected against electrolytic corrosion,
dissimilar metals shall not be used in intimate contact with each other. Dissimilar metals are
defined in MIL-STD-889.
3.2.6 Toxic and corrosive fumes. The indicator shall be of such material and construction
that when burned, fumes or gases that combine with the atmosphere to form acid or corrosive
alkali will not be released.
3.2.7 Protective treatment. When materials are used in the construction of the indicator
that are subject to deterioration when exposed to climatic environmental likely to occur during
service usage, the materials shall be protected against such deterioration in a manner that will in
no way prevent compliance with the requirements of this specification. The use of any protective
coating that will crack, chip, or scale with age or extremes of climatic and environmental
conditions shall be avoided.
3.3 Design and construction. The indicator shall be designed for use with a TRU-80/A
transmitter in accordance with MIL-T-25624 or an MS28005-2 transmitter conforming to
MIL-T-5796.
3.3.1 Case. The case shall be hermetically sealed and the dimensions shall conform to
MS28010.
3.3.1.1 Cap. A separate nonhermetically sealed cap may be used on the back of the case
for installing the electrical receptacle. The cap shall be made of nonferrous low-density metal.
3.3.1.2 Case-to-cover glass distance. The distance between the outer surface of the cover
glass and the front edge of the case shall be the minimum practicable and shall not exceed 1/32 inch.
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