MIL-DTL-13735G
4.8.8 Corrosion. To determine conformance to 3.5.1, the switch shall be tested in accordance with ASTM B117 as
specified and examined for leakage.
4.8.9 Fungus. To determine conformance to 3.5.2, the switch shall be subjected to the applicable fungus test and
examined to verify that fungal growth is not sustained and performance is not adversely affected.
4.8.10 Sand and dust. To determine conformance to 3.5.3, grade 2 switches shall be tested as specified in
method 110 of MIL-STD-202 except:
a.
Switches shall not be tested under electrical load conditions.
Sand and dust velocity shall be 2,500 ± 500 feet per minute.
b.
c.
Step 2 shall be omitted.
4.8.11 Waterproofness. To determine conformance to 3.5.4, grade 1 switches shall be tested as specified in step
1 and step 2.
Step 1: The component with its electrical connections, shall be submerged in a container with the uppermost
surface a minimum of one inch below the surface of the saline solution (see 4.3) and installed in the
chamber. The component shall be carefully observed during its entire 30 minutes of submersion. The
chamber shall be evacuated to a pressure six pounds below atmospheric so as to apply a minimum of
six pounds per square inch (psi) in internal pressure to all voids within the component. During this
period the component shall be carefully observed for poor seals, as evidenced by bubbles escaping
from the interior of the component . Leakage thus indicated shall be considered as noncompliance with
the waterproofness requirement and the component shall be rejected. Bubbles which are the result of
entrapped air on the exterior surfaces of the component shall not be considered a leak.
Step 2: The chamber shall then be pressurized to six pounds above atmospheric and the component again
observed for 30 minutes.
4.8.12 Extreme temperature. To determine conformance to 3.5.5, switches shall be subjected to the tests
specified in 4.8.12.1 and 4.8.12.2.
4.8.12.1 Low temperature. Switches shall be conditioned for 4 hours at -67 ± 2°F (-55 ± 1°C). After conditioning,
and while in ambient air at that temperature, the force specified shall be applied to the lever of each switch. The
switches shall then be operated for 1,000 cycles while connected to rated resistive load as specified on the applicable
MS standard or drawing.
4.8.12.2 High temperature. Switches shall be conditioned for 4 hours at 170 ± 2°F (77 ± 1°C). After conditioning
and while in ambient air at that temperature, the switches shall be operated for 1,000 cycles while connected to rated
resistive load current as specified on the applicable MS standard or drawing. Switches shall then be cooled to room
temperature and shall be examined for the defects listed in 3.5.5.
4.8.13 Shock. To determine conformance to 3.5.6, the switch shall be mounted by means of a suitable plate and
subjected to the shock test specified in method 213 of MIL-STD-202, condition I. A suitable device shall be used to
detect spurious opening and closing of contacts during the test.
4.8.14 Vibration. To determine conformance to 3.5.7, the switch shall be mounted as in intended operation by
means of suitable mounting plate or bracket to assure that mounting is free from resonance over the test frequency
range. The switch shall be subjected to a simple harmonic motion having an amplitude of .03 inch (no more than .06
inch total excursion), the frequency being varied uniformly between the approximate limits of 10 to 55 Hz. The entire
frequency range, from 10 to 55 Hz and return to 10 Hz, shall be traversed in approximately 1 minute. This motion
shall be applied for not less than 1 hour in line with each of the three major axes of the switch (a total of three hours of
vibration). A suitable device shall be used to detect spurious opening and closing of contacts during the test.
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