MIL-DTL-24317B
3.4.9 Mounting and spacer barriers (when applicable, see 3.1). Mounting and spacer barriers, shall be
of the design and color specified.
3.4.10 Panel seals (when applicable, see 3.1). Unless otherwise specified, panel seals shall be
fabricated from silicon rubber conforming to class III of A-A-59588 and shall be of the design, and grade
as specified.
3.4.11 Switch contacts. Unless otherwise specified (see 3.1), the switch contacting surfaces shall be
of a silver or silver alloy material.
3.4.12 Screw threads. Screw threads on externally threaded parts, or parts subject to replacement or
removal shall be in accordance with FED-STD-H28. Threading of nonmetallic parts shall not be
permitted.
3.4.13 Attitude. Unless otherwise specified (see 3.1), switches shall be so constructed as to insure
proper operation when mounted in any position.
3.5 Solderability. When switches are tested as specified in 4.8.2, 95 percent of the total length of fillet,
which is between the standard wrap wire and the terminal, shall be tangent to the surface of the terminal
being tested. There shall be no pinholes, or voids. A ragged or interrupted line at the point of tangency
between the fillet and the terminal under test shall be considered a defect. After the test there shall be no
evidence of fracture, loosening of parts, or any other mechanical failure of the switches.
3.6 Switch actuation and circuit configuration. When switches are tested as specified in 4.8.3, the
switch-circuit configuration shall conform to the specified diagram (see 6.2). Switches shall make and
break the required circuits in all positions. The making and breaking of circuits shall be positive. The
3.7 Contact resistance
3.7.1 Switch terminals. When measured as specified in 4.8.4.1, the resistance across the switch
terminals shall not exceed 25 milliohms, unless otherwise specified (see 3.1).
resistance across the lamp terminals shall not exceed 1.0 ohm.
3.8 Simultaneity. When switches are tested as specified in 4.8.5, the make and break of contacts
associated with any one station shall be simultaneous to within 25 milliseconds (ms).
3.9 Thermal shock. When switches are tested as specified in 4.8.6, there shall be no mechanical or
electrical damage. There shall be no discoloration or deformation of the lens.
3.10 Vibration, high frequency. Unless otherwise specified (see 3.1), when switches are tested as
specified in 4.8.7, there shall be no opening or closing of contacts in excess of 10 microseconds (usec).
During the test there shall be no visual indication of light intermittency. After the test, there shall be no
mechanical damage or impairment of operation.
there shall be no opening or closing of contacts in excess of 10 usec for method I or 20 ms for method II.
There shall be no change in operation, mechanical damage, broken, loose, deformed or displaced parts,
or impairment or normal operation.
3.12 Terminal strength. When switches are tested as specified in 4.8.9, there shall be no breakage,
loosening, or rotation of terminals, and no damage to the switch shall occur.
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