MIL-DTL-3661D
4.6.10 Torque (see 3.5.9).
4.6.10.1 Socket shell torque (applicable to bayonet base type sockets only). Lampholders and indicator-
light housings shall be mounted by their normal mounting means. An applicable bayonet locking plug shall be
inserted and locked in the socket. A torque of 4 +0/-1; pound-inches shall be applied for one minute to the test plug
at the end nearest the socket in a plane perpendicular to the centerline of the socket and in a clockwise direction. The
plug shall then be released and fully engaged and released five times by normal hand pressure. The specimen shall
then be lamped and energized to denote any electrical failure. The specimen shall be examined for evidence of
mechanical damage as noted by any abnormal movement of the socket shell (see 3.5.9.1).
4.6.10.2 Lens Torque (not applicable to non-removable lens type indicator lights (see 3.5.9.2)). The
lampholder or indicator-light housing shall be mounted in its normal manner and the lens shall be fully engaged into
its mating holder. A torque of 3 pound-inches shall be applied to the lens in the direction of tightening unless
otherwise specified (see 3.2).
4.6.10.3 Bushing torque (when applicable) (see 3.5.9.3). Lampholders and indicator-light housings shall
be mounted on a rigid metal panel by their normal mounting means with its associated hardware. A torque of 20
pound-inches, unless otherwise specified (see 3.2), shall be applied to the mounting nut.
4.6.10.4 Dimmer torque (applicable to lenses incorporating iris or other- dimming means) (see 3.5.9.4).
Dimmer torque shall be tested as follows:
(a) Method of mounting-The lens shall be fitted on its appropriate mating holder.
(b) Direction of torque-With the lens securely mounted, a torque of 10 pound-inches, unless otherwise
specified (see 3.2), shall be applied to the dimmer portion in both clockwise and counterclockwise
direction.
(c) Measurement-The torque required to move the dimmer over the limit of its travel in both clock-wise
and counterclockwise direction shall not exceed 2 pound-inches nor be less than 2 ounce-inches and the
movement shall be smooth.
4.6.11 Sealing (see 3.5.10).
4.6.11.1 Watertight. Before conducting this test, all gaskets which normally can be replaced in service
without disassembly of the indicator light proper, shall be disassembled from the indicator light and then
reassembled with the indicator light. The indicator light shall be mounted on a test enclosure (see figure 8) by its
normal mounting means, submerged in water to a depth of 6 ±2 inches and subjected to a gradually increasing
pressure at the rate of 1 pound per square inch gauge (psig) every 2 minutes, until a pressure of 15psig is reached.
This pressure shall be maintained for 30 minutes. During this period of maximum pressure, shutter-type lens design
indicators shall be operated for 25 cycles of complete clockwise and counterclockwise operations while submerged,
for press-to-test units, the unit shall be operated for 25 cycles of complete switching actuations while submerged.
During the test, the indicator light shall be observed for evidence of water leakage (see figure 8).
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