MIL-DTL-6508C
3.5 Materials. Materials shall conform to applicable specifications and shall be as
specified herein. Materials for which there are no applicable specifications or which are not
specifically described herein, shall be of the best quality, of the lightest practicable weight, and
suitable for the purpose intended.
3.5.1 Critical materials. Noncritical materials shall be used where practicable. Where
the use of a critical material is essential to meet specification requirements, the material used
shall be the least critical of those that are adequate for the purpose.
3.5.2 Metals. Metals shall be of the corrosion-resistant type, or shall be suitably
protected as specified herein to resist corrosion due to salt spray or atmospheric conditions to
which the instrument may be subject when in storage or during normal service life.
3.5.2.1 Dissimilar metals. Unless suitably protected against electrolytic corrosion,
dissimilar metals as defined in MIL-STD-889 shall not be used in intimate contact with each
other.
3.5.3 Nonmagnetic materials. Nonmagnetic materials shall be used for all parts of the
instrument except where magnetic materials are essential.
3.5.4 Fungus-proof materials. Materials that are nutrients for fungi shall not be used
where it is practicable to avoid them. Where used and not hermetically sealed, they shall be
treated with a fungicidal agent acceptable to the procuring activity.
3.6 Design and construction. The thermometer shall be designed for use on aircraft to
indicate the free air temperature and shall conform to MS28028. The thermometer shall be
constructed to withstand the normal strains, jars, vibrations, and such other conditions as are
incident to shipping, storage, installation and service.
3.6.1 Maintenance. The design shall be such as to facilitate as much as possible
disassembly, repair or overhaul, service maintenance, and reassembly by those tools and items of
maintenance equipment that are normally available as commercial standards.
3.6.2 Components. The thermometer shall consist of two mounting grommets, one
dished washer, one sunshield, and a thermometer assembly.
3.6.3 Washers and grommets. Washers and grommets shall conform to the dimensions
shown on MS28028. The mounting grommet shall be constructed from black molded gasket
rubber in accordance with HH-G-156, type II, grade A. The dished washer shall be fabricated of
a suitable metal.
3.6.4 Seal. The seal of the case and stem of the thermometer shall be waterproof.
3.6.5 Stem. The stem and threaded boss of the thermometer shall be constructed from
hard-drawn stainless steel.
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