MIL-DTL-25866C
shall not be turned on during the soak period, but shall be turned on during the tests to check
proper operation.
4.5.2.5 Sand and dust. The light shall be subjected to the sand and dust test in
accordance with MIL-STD-810, method 510, procedures I and II, at 77 °F (25 °C), except that
the test shall be of 4 hours duration. At the conclusion of the test, the assembly shall not be
adversely affected by the test.
4.5.2.6 Salt spray. The light shall be subjected to the salt fog test in accordance with
ASTM B117, for a period of 50 hours. At the end of the test, the assembly shall operate
satisfactorily, and there shall be no evidence of excessive corrosion or failure of any part to
function properly.
4.5.2.7 Explosion proof. The light shall be subjected to an explosive atmosphere test in
accordance with MIL-STD-810, method 511, procedure I.
4.5.2.8 Vibration tests. The test specimen shall be mounted in normal operating position
and subjected to vibration cycling in each of three mutually perpendicular planes. The cycling
shall be from 10 to 500 cycles per second in 15 minute cycles for a period of 2 hours in each
direction at an applied double amplitude of 0.036-inch or an applied acceleration of 10 G,
whichever is the limiting value. Suitable instructions shall be provided to detect nuisance
tripping of the contacts of the inertia switch and unwarranted opening or closing of the contacts
of any relays that may be used in the light. No permanent deformation of any of the components
of the light shall occur during this test.
4.5.2.9 Acceleration (functional test). The light shall be mounted on a centrifuge in
normal operating position and subjected to acceleration in the horizontal plane. The speed of the
centrifuge shall be gradually increased so that the operating point of the inertia switch may be
determined. A reading shall be taken in each direction as the light is rotated in 45 degree
increments around the axis of the inertia switch. During this test, the light shall not come on at
any time before an acceleration of 1.5 G is applied and shall not require more than 2.5 G to
become energized. The light shall remain on when subjected to an acceleration of 10 G.
4.5.2.10 Shock. The light shall be subjected to shock while mounted as it would
normally be mounted while in service. The shock-testing machine shall be designed and
fabricated in accordance with MIL-STD-202 or equivalent. The test unit shall be subjected to
18 impact shocks of 15 G acceleration, each shock impulse having a time duration of 11 ±1
milliseconds. The intensity shall be within ±10 percent when measured with a filter having a
bandwidth of 5 to 100 cycles per second. The maximum acceleration shall be reached in
approximately 5.5 milliseconds. The shock shall be applied in the following directions:
a. Vertically, 3 shocks in each direction.
b. Parallel to the major horizontal axis, 3 shocks in each direction.
c. Parallel to the minor horizontal axis, 3 shocks in each direction.
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