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|  MIL-T-62531(AT)
APPENDIX A
withstand climatic extremes as specified in MIL-STD-210, without deterioriation that may cause
failure of any component part of vehicle.
Rationale
Military requirements demand vehicles that are ready and capable to perform mission
requirements in a wide range of ambient temperatures, including arctic temperatures when the
arctic kits are installed.
Guidance
Vehicles shall be designed and constructed with components which will perform in ambient
temperatures from tropical high humidity areas to arctic without deleterious effect on any part.
All fuels and lubricants used shall meet the requirements of the specification.
Lessons Learned
4.8 Environmental operation. To determine conformance to high and low temperature
operation of 3.8, the vehicle fully loaded shall meet the performance requirements of 3.7 through
3.7.2.2 at ambient temperatures of plus 49C to minus 32C (1.2 to 1.8 m above ground). With
special equipment installed, the vehicles shall meet the performance requirements at an ambient
temperature of minus 32C to minus 46C (1.2 to 1.8 m above ground), to minus 54C ground
surface temperature. The vehicle shall be placed in storage and be subjected to the temperature
extremes specified in MIL-STD-210, for ground equipment, without deterioration that may cause
failure of any component part of the vehicle.
Verification Rationale
Vehicles must be tested following exposure (soaking) to the ambient temperatures specified.
Required performance of these temperatures must be affirmed prior to fielding the vehicles.
Verification Guidance
The vehicles shall be soaked at the extreme ambient temperatures for 24 hours prior to
conducting an operational performance test.
Verification Lessons Learned
3.9 Electromagnetic interference. Each vehicle shall be radio-interference suppressed in
accordance with tactical vehicle requirements, class C1 of MIL-STD-461.
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