MIL-DTL-5099C
3.2.3 Metals. Metals shall be of the corrosion-resistant type, or shall be suitably
protected as specified herein to resist corrosion due to fuels, salt spray, or atmospheric
conditions to which the indicator may be subjected when in storage or during normal service life.
3.2.3.1 Dissimilar metals. Dissimilar metals, as defined in MIL-STD-889, shall not be
used in intimate contact with each other, unless protection against electrolytic corrosion is
provided.
3.2.3.2 Aluminum alloy parts. Unless otherwise specified, aluminum alloy parts shall be
covered with a type IC, II, or IIB anodic film conforming to MIL-A-8625, or government-
approved alternate methods. The dial, small holes, threads, and case inserts need not be
anodized. Aluminum alloys that do not anodize satisfactorily shall be coated with a type II,
class 3 chemical film in accordance with MIL-DTL-5541. Alternate chemical film methods may
be substituted with government approval.
3.2.3.3 Steel parts. Steel parts shall be cadmium-plated where practicable in accordance
with SAE AMS-QQ-P-416. Alternate methods of corrosion prevention may be used with
government approval.
3.2.4 Protective treatment. When materials are used in the construction of the indicator
that are subject to atmospheric or environmental conditions likely to cause corrosion in normal
service life, they shall be protected against corrosion in a manner that will in no way prevent
compliance with the performance requirements of this specification. Finishes and protective
coatings which will crack, chip, or scale during normal service life, or are affected by extremes
of atmospheric or environmental conditions, shall not be used.
3.2.5 Fungus-proof materials. Materials that are nutrients for fungi shall not be used
where it is practicable to avoid them. Where used, they shall be treated with a fungicidal agent
acceptable to the procuring activity. If the indicator case is of a hermetically sealed design, then
fungicidal treatment of the materials or components installed within the case will not be
necessary.
3.2.6 Fumes and vapors. Materials used in the construction of the indicator shall not
produce corrosive, deleterious, or toxic fumes or vapors under the conditions specified herein.
3.3 Design and construction. The design of the indicator shall provide a pressure-
actuated mechanism. The indicator shall be so constructed that no parts will work loose in
service, and it will withstand the normal shocks, vibrations, and such other conditions as are
incident to service, shipping, storage, and installation without a failure.
3.3.1 Maintenance. The design shall be such as to facilitate as much as possible
disassembly, repair or overhaul, service maintenance, and reassembly using those tools and
items of maintenance equipment that are normally available as commercial standards.
3.3.2 Case. The case shall consist of a body, a mounting flange, and a bezel ring
conforming to MS33638 for the 2-inch nominal size, with an overall length of 1.750 ±0.125
inches. The case shall be made of nonferrous, low-density metal, uniform in texture, and shall
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