TM11-7025-229-12
Section IV. OPERATION UNDER UNUSUAL CONDITIONS
2-8.
OPERATION IN UNUSUAL WEATHER
It may be necessary to operate the disk unit under abnormal conditions where extreme cold, heat, humidity, moisture, or
sand and dust conditions prevail. Instructions for minimizing the effects of these unusual operating conditions are given
in the following subparagraphs.
NOTE
Rapid changes in temperature may cause the disk unit to fail until the ambient
temperature has stabilized throughout.
a. Arctic Climates. Subzero temperatures and climatic conditions effect the proper operation of the
equipment. Handle the equipment carefully. Parts, especially plastics and wiring insulation, become brittle at subzero
temperatures. When equipment is exposed to cold air, moisture will condense on it. Dry the equipment thoroughly.
Equipment should be operated in a heated environment (table 1-2).
b.
Tropical Climates. In tropical climates, the high relative humidity causes condensation of moisture on the
unit whenever equipment temperature becomes lower than that of the surrounding air (table 1-2). Adequate ventilation
will minimize this condition. Check frequently for fungus or moisture on the unit. Remove any fungus or moisture, using
a lint-free cloth and alcohol.
c. Desert Climates. The main problem arising in desert operation is sand, dust, or dirt getting into the
equipment. Keep the equipment as free of foreign material as possible.
2-9.
EMERGENCY PROCEDURES
If an emergency occurs, shut down main power source to the equipment. Refer to the applicable system manual for
additional emergency shut-down procedures. However, if the OVER TEMP indicator lights, it is not necessary to shut
down main power until the end of a mission.
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