2-38. OPERATING FORWARD REPAIR SYSTEM (FRS) IN DESERT ENVIRONMENT.
FM 90-3 contains detailed instructions for living and working in the desert.
To determine unstable ground, observe a PLS tire track imprint left in the ground near the
FRS. If the tire track imprint depth is greater than 1/8, follow procedures in Para 2-39
Operating FRS on Unstable or Uneven Ground.
Principles for operating in extreme heat and extreme dust, sand, or mud apply to desert environment
(Para 2-36 and 2-37).
Temperatures may change as much as 70 F (21 C) between day and night. These changes may damage
equipment if FRS is not properly prepared. Due to expansion and contraction of all fluids and air, care
should be taken when filling fuel tank and fluid reservoirs to prevent overflow when temperatures