MIL-DTL-16377J(SH)
3.5.12.3 Parts. When specified in the applicable specification sheet, parts shall withstand the shock test
3.5.13 Vibration. When specified in the applicable specification sheet, and for all Type III luminaires, fixtures
and parts shall withstand, without damage or loosening of parts, the Type I vibration test in accordance with
MIL-STD-167-1 as specified in 4.8.8. Use of locking devices is satisfactory to prevent loosening of parts. Type I
lamps shall show no permanent loss of illumination during the vibration test. Failure of Type II lamp filament does
not constitute failure of fixture tested. Type III luminaires shall show no permanent loss of illumination during test.
3.5.14 Noise. All Type III luminaires, and when specified in the applicable specification sheet, fixtures, lights,
or parts shall not exceed the sound pressure level of 28 decibels (dB) referenced to 0.0002 microbars or the sound
pressure level specified in the applicable specification sheet for airborne noise only when tested as specified in 4.8.9.
3.5.15 Salt spray. Fixtures and parts made of steel or aluminum for weather deck installation shall withstand
3.5.16 Shock mounts. Shock mounts shall be furnished as specified in the applicable specification sheet.
Thickness of material shall be manufacturer's choice if failure occurs under the shock and vibration tests. Type III
luminaires intended as direct replacements for Type I and Type II luminaires shall not be required to utilize shock
mounts if testing can be passed without them.
3.5.17 Ambient temperature. The fixtures, lights, and parts shall operate in the temperature specified in the
applicable specification sheet when tested as specified in 4.8.19. All Type III luminaires shall be designed to
operate within an ambient temperature range of -13 to 140 °F.
3.6 Parts and features electrical.
3.6.1 Safety. Fixtures and parts shall be constructed in a way that will ensure safety to operating and
maintenance personnel. When properly installed and the enclosure is grounded, there shall be no accessible way for
operating personnel to receive an electric shock even though an internal fault may exist between two circuits,
between any circuit and a structural member, or between any circuit and ground. The design shall hold to a practical
minimum the possibility of maintenance personnel being exposed to electric shock while servicing, adjusting, or
checking out the fixtures or parts.
3.6.2 Lamps. Unless otherwise specified (see 6.2), lamps for Type II fixtures shall not be furnished. Lamps for
Type I fixtures shall be as specified in the applicable specification sheet and shall be furnished assembled in the
fixture.
3.6.3 Lamplocks for type I fixtures. Lamplocks for Type I fixtures shall be as specified in the applicable
specification sheet and shall be furnished assembled in the fixture. Lamplocks shall provide for maximum
protection against lamp loosening or rotation under the shock and vibration tests.
3.6.4 Lampholders. Lampholders shall be in accordance with the naval-use lampholders section of UL 496 and
as specified herein. The type shall be as specified in the applicable specification sheet.
3.6.4.1 Lampholder spacing for type I fixtures and lights. Unless otherwise specified in the applicable
specification sheet, spacing between faces of lampholder supports at the point of lampholder attachment for Type I
fixtures and lights shall be as shown on figure 21.
3.6.4.2 Insulating spacer for type II fixtures and lights. An insulating spacer shall be installed between the
lampholder metal mounting base and the lampholder in the case where the lampholder is provided with screws or
other devices for electrical connections that are exposed to the mounting base. Material shall be as specified in
3.6.4.3 Counterbored holes. Counterbored holes in the bottom of lampholders or insulated bases shall not be
filled with sealing wax or with rosin after screws are in place.
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