MIL-DTL-16938D
3.2.5.1. A powder coating using Rohm Haas Powder Coating, Corvel Grey, Polyester, 30-7241
or 30-7186, in accordance with MIL-PRF-24712, may be used instead of paint.
3.2.5.1 External surfaces. Painting of external surfaces shall conform to the color, gloss,
flexibility, resistance to water immersion, and reflectance of Navy Haze Gray No. 27 (26270) in
accordance with MIL-PRF-24635. The paint shall not discolor or become soft when the
searchlight is operated at rated voltage for a period of 2 hours with the shutter closed. Internal
surfaces shall be painted a dull black, unless surface has power coating.
3.3 Interchangeability. All similar parts, including repair parts, of corresponding
apparatus furnished on the same order or built to the same manufacturer's drawings shall be
strictly interchangeable without the necessity of further machining or hand fitting of any kind.
3.4 Threaded parts. Screw threads shall conform to the requirements in FED-STD-H28.
3.5 Detail requirements.
3.5.1 Light tightness. The searchlight shall be light tight when the lamp is energized, the
shutter closed or open, and the front glass covered (no light shall be visible at any time from any
part of the searchlight from a distance of 100 feet).
3.5.2 Waterproofness. The construction of the searchlight shall be such that no water
that might interfere with the operation of the searchlight shall enter when the searchlight is
subjected to the test specified in 4.6.2.
3.5.3 Shockproofness. The searchlight, less the lamp, shall be so designed as to
withstand high impact shock as specified in MIL-S-901 without the fracturing or deformation of
any parts of the assembly when tested as specified in 4.6.3.
3.5.4 Vibration proofness. The searchlight shall be designed to operate during vibration
tests specified in 4.6.4. All fasteners (bolts, screws, screw clamps, rivets, ect.) shall remain tight
and rigidly fixed and no damage shall be sustained by the assembly or its components.
3.5.5 Corrosion resistance. The searchlight shall not be impaired when tested as
specified in 4.6.5.
3.5.6 Insulation resistance. The insulation resistance between all current-carrying and
non-current-carrying parts shall be not less than 1 megohm (see 4.6.6).
3.5.7 Dielectric strength. There shall be no evidence of breakdown when the searchlight
is subjected to the dielectric test specified in 4.6.6.
3.5.8 Safety. Particular care shall be taken in the design and construction of the
searchlight to insure safety of the operating personnel from the dangers of electric shock and of
contact with high temperatures. Effective electric grounding of the assembly shall be maintained
as all times to prevent electric shock to personnel in contact with any parts of the unit.
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