MIL-DTL-58085C
4.5 Tests.
4.5.1 Conditions. Other than for the environmental test specified in 4.5.4, tests on
the light shall be conducted at an atmospheric pressure of 29.9 inches of mercury (Hg),
plus or minus 1 inch, and at a temperature of 78º F, plus or minus 20º F.
4.5.2 Operation. The light shall be mounted to a flat 18 by 18 inch aluminum sheet
painted with zinc chromate primer, and under conditions simulating actual installation,
operated at room temperature (approximately 77º F) from a 24 to 30 volt source. The
flash rate and light intensity shall be tested to determine conformance with 3.5.3 and
3.5.4. Any evidence of malfunction or overheating of the motor shall be cause for
rejection of the lot represented. In first article testing only (4.2), the light shall operate a
minimum of 100 hours before the flash rate and the light intensity are tested.
4.5.3 Endurance. The light shall be mounted to a flat 18 by 18 inch aluminum
sheet painted with zinc chromate primer, and under conditions simulating actual
installation, except with means provided for inverting the light without interrupting
operation. The light shall be operated from a 28 volt dc source, plus or minus 1 volt. The
rotating mechanism shall be operated 500 hours in the upright position and 500 hours in
the inverted position. After this test, any evidence of excessive wear or malfunction in
any part other than the lamp filament shall be cause for rejection of the lot. The average
lamp life over this test period shall not be less than 250 hours. Room temperature blast
cooling air may be provided for 23 out of each 24 hours of the testing.
4.5.4 Environmental. Environmental test (see 3.3.4.1) shall be in accordance with
the applicable method as specified in MIL-STD-810:
(a)
High temperature
501.3, Procedure I at 106º F
(b)
Low temperature
502.3
(c)
Rain
506.3
(d)
Humidity
507.3, Procedure I
(e)
Fungus
508.4
(f)
Salt fog
509.3
(g)
Sand and dust
510.3
(h)
Vibration
514.4, Procedure I, Category 6
The light shall be operating during the entire vibration test (see (h) above). There shall
be no more than one lamp filament failure on the two lights tested during the vibration
test. After these tests, the light shall be inspected to determine whether it meets all
operational requirements of this specification. The duration of the test shall be 3.5 hours
in each of three mutually perpendicular axes. The specific model aircraft for which this
item is used on is the UH-1 H/V model aircraft and the appropriate vibration spectra is
referenced in method 514.4.
4.5.5 Electromagnetic compatibility. The light shall be tested as specified in MIL-
STD-461, except that the test shall be conducted only between 150 kilocycles and 399.9
megacycles.
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