MIL-DTL-3661D
3.5.9 Torque.
3.5.9.1 Socket shell torques (applicable only to lampholders and indicator-light housings that are designed
to accept bayonet base lamps). When lampholders and indicator-light housings are tested as specified in 4.6.10.1, the
socket shell shall withstand the applied torque with no resultant permanent damage.
3.5.9.2 Lens torque. The lens when tested as specified in 4.6.10.2, shall withstand the specified torque
without any mechanical damage to the lens assembly or mating holder.
3.5.9.3 Busing torque. Indicator-lights and indicator-light torque housings, that are bushing mounted, shall
withstand the specified torque when tested in accordance with 4.6.10.3, without any mechanical or electrical
damage.
3.5.9.4 Dimmer torque. Lenses, incorporating dimmer designs, shall withstand the specified torque when
tested in accordance with 4.6.10.4. No mechanical damage shall occur.
3.5.10 Sealing. When specified (see 3.2), indicator lights shall be tested as specified in 4.6.11. There shall
be no evidence of water leakage around the test enclosure opening.
3.5.11 Salt spray (corrosion). When lampholders, indicator lights, indicator-light housings and lenses are
tested as specified in 4.6.12, there shall be no evidence of excessive corrosion. Excessive corrosion is defined as that
which interferes with the electrical or mechanical performance, or in the case of plated metals, corrosion which has
passed through the plating and attacked the base metal. There shall be no warping, cracking, or other damage and
the lenses shall show no color degradation.
3.5.12 Life.
3.5.12.1 Electrica1. When lampholders and indicator lights are tested as specified in 4.6.13 and 4.6.14,
there shall be no light intermittency noted during the test and the applicable lens shall have an even color
distribution over the viewing area after the test.
3.5.12.2 Mechanical (applicable to dimmer type indicator lights). The light dimmer cover shall be capable
of operation from extreme dim to extreme bright positions, without failure as specified in 4.6.15.
3.5.13 Vibration. When lampholders, indicator lights, indicator-light housings and lenses are tested as
specified in 4.6.16, the contact-spring pressure shall be as specified in 3.5.8, and there shall be no chipping,
cracking, or crazing of materials, or loosening, bending, warping, or distortion of parts, and the orientation of
rotatable indicator-light lenses shall not change.
3.5.14 Shock. When lampholders, indicator lights, indicator-light housings and lenses are tested as
specified in 4.6.17, the contact-spring pressure shall be as specified in 3.5.8, and there shall be no chipping,
cracking, or crazing of materials, or loosening, bending, warping, or distortion of parts.
3.5.15 Moisture resistance. When lampholders, indicator lights, indicator-light housings and lenses are
tested as specified in 4.6.18, the insulation resistance shall be not less than 25 megohms, and the dielectric
withstanding voltage shall be as specified in 3.5.1. There shall be no corrosion, the black finish (see 3.3.3.2.2.1)
shall not be removed, and there shall be no decomposition, leaching out, or spreading of constituent materials, or
other defect detrimental to the intended function of the lampholder, indicator light, indicator-light housing or lens,
and no loss of color or discoloration.
3.5.16 Luminance. Indicator lights shall be tested in accordance with 4.6.19 and the brightness level shall
be in accordance with 3.2, when specified.
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