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|  MIL-D-70789A (AR)
3.7.4
Snow.
3.7.4.1 Falling snow. The DRU shall not be damaged and
shall operate during and after exposure to falling snow with a
rate of -3 inches per hour (76 mm/hr) and crystal size of
3
2.0 x 10 inch (0.05 mm) to 0.8 inch (20 mm) in diameter.
3.7.4.2 Blowing snow. The DRU shall not be damaged and
shall operate during and after exposure to blowing snow with
-2
-3
crystal size 8.0 x 10 inch (0.2 mm) to 1.6 x 10 inch (0.4 mm)
diameter and winds of at least 16 fps (5mps).
3.7.4.3
Snowload. The DRU shall not be damaged and shall2 be
2
operable after exposure to a snowload of 20 lbs/ft (97.7 Kg/m ).
3.7.5
Icinq.
The DRU shall not be damaged and shall
3.7.5.1 Frost.
operate during and after exposure to frost of thickness 3 inches
(76 mm) and specific gravity of 0.2.
The DRU shall not be damaged and shall
3.7.5.2 Rime.
operate during and after exposure to rime ice of thickness 6
inches (152 mm) and specific gravity of 0.2.
3.7.5.3 Clear glaze.
The DRU shall not be damaged and shall
operate during and after exposure to clear glaze ice of thickness
3 inches (76 mm) and specific gravity of 0.9.
3.7.6 Solar radiation. The DRU shall operate during and
2
after exposure to solar radiation of 360 BTU/ft /hr (1135
2
watts/m ) for 4 hours at an ambient temperature of +125F
(+51.6C) at winds Of 8.5 feet/see (2.6 m/see) or less. Maximum
2
solar radiation will be higher by 4 BTU/ft /hr per 1,000 feet
2
(43 w/m per 1,000 m) and ambient air temperatures will be lower
by 5F per 1,000 feet for ground elevations above 3,000 feet up
to 15,000 feet.
3.7.7 Washdown.
The DRU shall suffer no damage or leakage
when exposed to high pressure water washdown.
3.7.8 Salt fog.
The DRU shall not be damaged and shall
operate without degradation to specified performance levels while
4
2
being subjected to salt fallout of 5.7 x 10 pounds/feet /year
-3
Z
(2.8 x 10 Kg/meter /year).
3.7.9 Funqus. The DRU shall not be damaged and shall
operate after exposure for 90 days to the fungi of MIL-STD-810,
Method 508.3.
68
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