MIL-DTL-16938D
3.7.3.1 Shutter housing. The housing shall conform to figure 5 and shall independently
retain the shutter and shutter operating mechanism. The back end of the housing shall fit tightly
to the gasketed lamp and backshell to form a watertight seal. Means shall be provided to insure
proper alignment between the backshell, lamp gasket, and shutter housing. The housing shall be
clamped to the backshell by means of a circular clamp ring with a quick release toggle lever for
ease of lamp replacement (see figure 6). The front end of the housing shall be sealed with the
cover frame and glass. Means shall be provided on the outside of the housing for supporting the
searchlight in it mounting assembly.
3.7.3.2 Sight. A simple "V" notched type rear sight and bead front sight shall be
mounted on the shutter housing between the operating levers.
3.7.3.3 Shutter operating mechanism. The shutter shall be operated by a small, finger-
operated lever conforming to figure 7. The design shall be such that the shutter shall be
completely opened from its closed position by the moving of the operating point of the trigger
approximately 45 degrees in a downward-backward motion and employing a torque of 1.5 inch-
pounds. The shutter shall have a spring return, automatically forcing the shutter to its closed
position when the operating lever is released.
3.7.3.4 Adjustments. One lever shall be located on each side of the shutter housing, and
the levers shall be interconnected through the operating mechanism. A method shall be provided
to adjust the tension of the return springs. Stops shall be provided for both levers to avoid
twisting of the drive shaft beyond the open position of the shutter. One of the levers shall be
provided with an easily manipulated locking device which shall positively lock the shutter in the
open position. The locking device shall not function when the shutter is in operation.
3.7.4 Backshell. The backshell assembly shall consist of a housing and lamp conforming
to figure 8 and a lamp gasket conforming to figure 9. The front of the housing shall be shaped to
fit the gasketed lamp. The lamp cabling shall penetrate the bottom of the backshell assembly. A
handle shall be mounted on the backshell assembly for controlling the direction to the light
beam. A stuffing tube suitable for the size LSTHOF-9 cable shall be provided for the cable
entrance into the backshell. A contact for the grounding lead of the cable shall be provided
within the backshell.
3.7.5 Mounting. The mounting base shall conform to figures 10 and 11 and shall be
suitable for holding the searchlight mounting pivot in the vertical position and for clamping the
searchlight in all horizontal positions. A grooved friction clamp will be considered a suitable
method. The diameter of the bore shall permit a loose fit of the mounting pivot. The design
shall be such that the mounting pivot shall not turn due to the inertia of the searchlight, and the
searchlight shall not fall out of the mounting base when it is held in an inverted position or when
subjected to the shock tests of 4.6.3. Rail clamps (see figure 12) to which the base can be
secured shall be provided to mount the searchlight on a 1-1/4 inch iron pipe rail.
7
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business