MIL-DTL-26202E
4.4 Examinations.
4.4.1 Examination of product. Each light shall be examined to determine conformance to this
specification with respect to materials, workmanship, cleaning, and marking.
4.5 Test methods.
4.5.1 Assembly and operation. The light shall be completely assembled with lamps and filters
installed upon the applicable base, and operated to determine that components fit properly and
design requirements are met.
4.5.1.1 Intensity distribution. The light shall be operated without filter to determine that it meets the
requirements of the MS, and of 3.5.8.5.1.
4.5.1.2 Chromaticity. The light shall be operated with filter to determine that it meets the
requirements of 3.6.4.2, and the MS.
4.5.2 Environmental. One light of each class shall be subjected to the following tests, conducted in
accordance with MIL-STD-810, to determine proper operation and freedom from adverse effects
resulting from environmental exposure.
4.5.2.1 Low temperature. The low temperature test shall be conducted in accordance with low
temperature test Procedure II for 48 hours, followed immediately by operation and examination of the
light. Any evidence of damage shall be cause for rejection.
4.5.2.2 Humidity. The humidity test shall be conducted in accordance with humidity test for 360
hours. Any evidence of damage, rusting, or corrosion shall be cause for rejection.
4.5.3 Vibration. Vibration shall be conducted in accordance with Method 204A, test condition B of
MIL-STD-202. The light shall be mounted on the vibration machine by attaching necessary brackets
or adaptors to the light where the base, clamp ring, and housing join.
4.5.4 Leakage. Sample lights of all classes shall be bolted to a base or special test ring, submerged
under water, and subjected to an internal air pressure of 7 ±2 psi for 10 minutes and shall meet the
requirements of 3.6.3.1. Following this test, the 24 hour operation test shall be conducted. Any
indication of leakage shall be a cause for rejection.
4.5.5 24 Hour operation. The light shall met the requirements of 3.6.2 when installed in a simulated
operating environment as follows: A base in accordance with MS24526 shall be buried in dry builders
sand in a suitable container so that there is at least 6 inches of sand around the side and bottom of
the base. The top of the base shall be 3/4 inch below the top surface of the sand after the light is
installed. The light shall be bolted to the base with the necessary hardware and gaskets in place. If a
transformer is used, it shall not be inside the base. The light shall be operated continuously with an
industry PAR 56 type of 500 watts lamp for 24 hours. High temperature leads shall be used to
connect the transformer to the lamp. The ambient temperature shall not fall below 55° F. The
container shall be shielded from the wind if the test is conducted outdoors.
4.5.6 Temperature shock. One light of each class with filters installed shall be operated at rated
current at room temperature for not less than 4 hours, after which, the light shall be immediately
splashed with water at 32° F. Any glass breakage or evidence of water penetration shall be cause for
rejection.
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