MIL-DTL-27723F
3.4 Materials.
3.4.1 Nonmagnetic materials. Nonmagnetic materials shall be used for all parts except
where magnetic materials are essential.
3.4.2 Fungus resistant material. Materials that are nutrients for fungi shall not be used
where it is practical to avoid them. Where used and not hermetically sealed, they shall be treated
with a fungicidal agent acceptable to the procuring activity.
3.4.3 Corrosive Fumes. The materials, as installed in the probe and under the service
conditions specified herein, shall not liberate toxic, harmful or corrosive fumes.
3.4.4 Metals. Metals shall be of a corrosion-resistant type or suitably treated to resist
corrosion due to fuels, salt fog, or atmospheric conditions likely to be found in storage or normal
service.
3.4.4.1 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.
3.4.5 Protective treatment. When materials are used in the construction of the probe that
are subject to deterioration when exposed to climatic and environmental conditions likely to
occur during service usage, they shall be protected against such deterioration in a manner that
shall in no way prevent compliance with the performance requirements of this specification. The
use of any protective coating that may crack, chip, or scale with age or with extreme climatic or
environmental conditions shall be avoided.
3.5 Design and construction.
a resistance element, air scoop, strut, mounting flange, electrical connector, and heaters necessary
to prevent the formation of ice. The design details shall in no way constitute a waiver from the
performance requirements specified herein.
3.5.1.1 Temperature compensation. The deicing heater element shall be automatically
regulated in such a manner that the power dissipated through the heater will be an inverse
function of the heater element temperature.
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