MIL-DTL-16938D
inspected for it general ruggedness, apparent shockproofness, and reliability with respect to its
probable service life. The fit of parts shall be observed with particular reference to the
interchangeability of such parts as are likely to require replacement during normal service life of
equipment.
4.5.3 Interchangeability. Examination shall be made to verify compliance with the
requirement of 3.3.
4.5.4 Repair parts. All repair parts of sample searchlights shall be subjected to a careful
examination to ascertain that the materials, workmanship, and finish comply fully with the
manufacturer's accepted drawing.
4.5.5 Safety. Each sample searchlight shall be examined to determine conformation to
3.5.8.
4.5.6 Inclination. The sample searchlight shall be examined to verify compliance with
the requirements of 3.6.1.
4.6 Test.
4.6.1 Light tightness. The light tightness of the searchlight, with the lamp burning at
rated voltage, shall be checked to determine compliance with 3.5.1 both with and without the
shutter in operation. This test shall be made with the cover glass completely covered.
4.6.2 Waterproofness. Compliance with 3.5.2 shall be checked by applying a stream of
water from a hose 1 inch in diameter under a head of approximately 35 feet from a distance of
10 feet on the searchlight for 60 minutes. The stream shall be projected against the searchlight
from all direction, including the bottom. During this test the searchlight shall be operated in the
horizontal position.
4.6.3 Shock. The searchlight, less the lamp, shall be tested for shockproofness in
accordance with MIL-S-901 (see 3.5.3). The classification of the shock test shall be type A for
the lightweight equipment.
4.6.3.1 Impact. Samples of glasses with all surfaces fully abraded shall be placed on a
wooden block and arranged concentrically over a hole in the block having an approximate
diameter of 7 inches. Breakage of samples tested shall not exceed 20 percent when a 1 foot-
pound impact blow is applied with a steel ball, weighing 1/2 pound, striking the approximate
center of the plate.
4.6.4 Vibration. The searchlight shall be tested for environmental vibration in
accordance with type I of MIL-STD-167-1.
4.6.5 Salt spray test. The searchlight unit, complete with the signaling shutter and with
lamp burning at rated voltage in cycles of operation consisting of 12 minutes on and 12 minutes
off, shall be placed in a salt spray machine, and subjected to the following tests:
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