TM 55-1680-351-10
Temperature (
F)
Cold soak time
Plus 32
............................................................ 30 minutes
0.............................................................. 15 minutes
Minus 40.......................................................... 5 minutes
(1)
Keep the equipment in low temperature storage when not
in use.
(2)
Use water-repellent material (SB 38-100) to cover the
shipping carton during periods of high humidity.
Section III. OPERATION UNDER UNUSUAL CONDITIONS
36.
Operation in Desert and Tropical Areas
a.
Desert Regions. Before using the equipment in desert regions,
remove all sand and dust. Blow and shake sand out of speaker and
microphone.
b.
Tropical Regions. In climates of high humidity, such as tropics,
inspect the equipment daily for fungus, mold, insects and metallic
corrosion.
Do not open the AN/PRC-90 case chassis. Only
higher category maintenance personnel may
work on components. Opening the case will
permit moisture and dust to enter the unit,
resulting in a possible malfunction.
3-20
