MIL-PRF-83287G
3.3.1 Pure tin. The use of pure tin, as an underplating or final finish, is prohibited both internally and externally.
Tin content of indicator components and solder shall not exceed 97 percent, by mass. Tin shall be alloyed with a
minimum of 3 percent lead, by mass (see 6.3).
3.3.2 Metals. Metals shall be of the corrosion-resistant type or shall be plated or treated to resist corrosion.
3.3.2.1 Dissimilar metals. When dissimilar metals are used in intimate contact with each other, protection against
electrolysis and corrosion shall be provided. The use of dissimilar metals in contact, which tends toward active
electrolytic corrosion (particularly brass, copper, or steel used in contact with aluminum or aluminum alloy) is not
acceptable. However, metal spraying or metal plating of dissimilar base metals to provide similar or suitable abutting
surfaces is permitted. Mounting hardware of dissimilar metals designed to abrade surfaces, such as toothed or stay
locking washers, shall not be permitted.
3.3.3 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.
3.4 Interface and dimensions. The indicator shall be a magnetic latching type and shall be so designed that the
removal of fault coil voltage shall not cause or permit loss of fault indication. Indicators shall be supplied with
mounting hardware. Indicators shall be of the interface, weight, and physical dimensions specified (see 3.1).
3.4.1 Reset. Indicator reset shall be mechanical or electrical as specified (see 3.1).
3.4.1.1 Mechanical. The indicator shall be reset by rotating the knurled ring 60 degrees clockwise with spring
return. From -40°C to -65°C manual aid to spring return is permissible (see 3.10).
3.4.1.2 Electrical.
3.4.1.2.1 Single coil. The indicator shall be reset by applying a pulse at rated voltage and reverse polarity.
3.4.1.2.2 Dual coil. The indicator shall be reset by applying, to the reset coil, a voltage of the same magnitude and
polarity as was applied to the set coil to bring about fault indication.
3.4.2 "Fault" and "No fault" indication. Operational readiness is indicated by the "No fault" condition and
operational non-readiness by the "Fault" condition. "Fault" and "No fault" indication shall be as specified (see 3.1).
Colors shall be lusterless black in FED-STD-595/37038, or black anodize, and lusterless white in FED-STD-
595/37875, or clear anodize. Other colors shall be as specified (see 3.1).
3.4.3 Termination. Indicators shall be terminated with solder terminals or wire leads as specified (see 3.1).
3.4.3.1 Solder terminals. Solder terminals shall be wire type or rigid type and shall be designed to prohibit shorting
between terminals if the terminals become deformed. The solder terminal configuration (such as, loop, turret,
flattened, and pierced, etc.) shall be designed to accommodate one No. 22 AWG wire either by wrapping or insertion
through a hole.
3.4.3.2 Wire leads. The insulation color of wire leads shall be as specified (see 3.1).
3.4.4 Color. The exterior surface of the indicator shall be Lusterless Black in FED-STD-595/37038 or black
anodize.
3.4.5 Threaded parts. Threaded parts shall be in accordance with FED-STD-H28, and shall be as specified (see
3.1). Threaded parts shall engage by at least three full threads.
3.4.6 Case. The indicator shall be designed as to prevent any electrical contact between the case and the coil.
However, the case may be a part of the magnetic circuit.
3.4.7 Window. The indicator shall have a glass window. When specified (see 3.1), the glass shall have an anti-
reflection coating (see 6.2).
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