MIL-DTL-62481A(AT)
3.7.2 Low pressure (altitude). The control unit shall operate as specified in 3.5.1 through
3.5.6 at altitudes of 0 to 10 000 feet (ft) (0 to 3050 meters (m)). Non-operating, the control unit
shall withstand exposure to altitude from 0 to 40 000 ft (0 to 12 200 m).
3.7.3 Humidity. The control unit shall be capable of operating as specified in 3.5.1
through 3.5.6 during and after exposure to cyclic humidity conditions of 5% to 95% relative
humidity at ambient temperatures of 90 to 145°F.
3.7.4 Fungus. The control unit shall be capable of operating as specified in 3.5.1 through
3.5.6 after 90 days of exposure to conditions favorable to fungus growth.
3.7.5 Salt fog. The control unit shall be capable of operating as specified in 3.5.1 through
3.5.6 following cyclic exposure to a 5% salt fog atmosphere for a minimum of four
(2 wet and 2 dry) 24 hour periods.
3.7.6 Sand and dust. The control unit shall be capable of operating as specified in 3.5.1
through 3.5.6 following exposure to blown sand particles of 0.0000039 to 0.039 in.
(0.0001 to 1 mm) in diameter with predominant diameters between 0.0059 and 0.0118 in.
(0.15 to 0.3 mm), and with velocity of 30 knots (55.6 kilometer per hour (km/hr)) to 35 knots
(64.8 km/hr).
3.7.7 Water resistant. The control unit shall be spray tight, such that following a cleaning
by hosing with water, it shall be capable of operating as specified in 3.5.1 through 3.5.6.
3.7.8 Explosive atmosphere. The control unit shall be capable of operating as specified in
3.5.1 through 3.5.6 and not cause ignition of an ambient-explosive-gaseous mixture of air when
operating in a fuel vapor-laden.
3.7.9 Vibration. The control unit shall be capable of operating as specified in 3.5.1
through 3.5.6 while being subjected to vibration levels of 1.5 and 4.2 gravity (g) in frequency
range of 5 to 500 Hz a sweep time of 15 times in each of three major axes, and shall evidence no
permanently deformed, cracked, or broken parts.
3.7.10 Shock. The control unit shall be capable of operating as specified in 3.5.1 through
3.5.6 following the shock of a total of 9 blows: one each 1-foot blow, 3-foot blow, and
5-foot blow on the back, side, and top of the test plate encountered during normal operation.
3.7.11 Electromagnetic interference. When specified (see 6.2), electromagnetic
interference (EMI) shall be in accordance with table I, and figures 3, 4, and 5.
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