MIL-DTL-16938D
3.5.8.1 Electric shock. Means shall be provided for automatically de-energizing the
lamp terminals when the searchlight is opened for re-lamping.
3.5.8.2 High temperatures. Points, which may at any time become hot enough to cause
personal injury, shall be heat insulated or the temperature shall be maintained below 131 °F
(55 °C) assuming an ambient temperature of 77 °F (25 °C).
3.6 Performance. The searchlight with the signaling shutter shall be capable of manually
transmitting messages at speeds up to 15 words (300 operating cycles of the shutter) per minute.
The beam spread shall not be less than 8 degrees horizontal by 7 degrees vertical.
3.6.1 Inclination. The searchlight shall be designed to provide for vertical adjustment of
the beam axis of at least 60 degrees above and 45 degrees below the horizontal plane, and for
turning the searchlight through a horizontal angle of at least 360 degrees. There shall be
adjustments for securing the searchlight in all positions.
3.6.2 Operation. The searchlight shall give no indication of electrical or mechanical
faults when tested in accordance with 4.6.9.
3.7 Component parts. The following assemblies of the searchlight shall be constructed
so that the fitting dimensions insure interchangeability with the corresponding assemblies of any
searchlight furnished under this specification, without further machining or hand fitting of any
kind.
3.7.1 Filter frame. The filter frame assembly shall conform to figure 3 and shall support
the glass filter. The filter frame shall be easily attached and detached from the cover frame
without the use of tools. Three filter frames, each containing one glass filter of the following
color and grade of glass in accordance with FED-STD-3 shall be furnished:
a. Aviation green, grade D.
b. Signal red, grade A.
c. Aviation yellow, grade B.
The glass shall be able to withstand a 1 foot-pound impact blow (see 4.6.3.1).
3.7.2 Cover frame. The cover frame shall conform to figure 4. The cover frame shall be
capable of securing the cover glass to the shutter housing, and for supporting the filter frame. A
locking device shall be employed to secure the filter frame to the cover frame.
3.7.2.1 Cover glass. The cover glass shall be flat and not less than 3/16 inch thick. It
shall be made of clear glass, free from bubbles, striae, checks, wrinkles, or other defects and
blemishes, and shall be tempered for heat and shock resistance.
3.7.3 Shutter. The shutter assembly shall consist of a metal housing containing the
shutter blades and their operating mechanism. The shutter assembly when installed, but fully
opened, shall not reduce the peak beam candle power more than 25 percent.
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