TM 5-4220-227-14 Table 2-1.  Operator Preventive Maintenance Checks and Services (PMCS) (Cont). B - Before D - During A - After Interval Item Item to be Inspected. Equipment Is Not Ready No. B D A Procedure Available If 8 Absorbent.  Check level of absorbent, if low, Level of absorbent is low or or crystals are blue, service scrubber assem- crystals are blue bly (para. 2-10). After unit is used for treatment of personnel, service scrubber assembly (para.  2-10). 9 Reservoir, Heater/Chiller Module.  Check the fluid level of the reservoir. The fluid mixture is 25% propylene glycol, 75% water by volume. 10 Battery, Communicator System.  Disconnect communicator unit from AC power source. Observe battery low voltage indicator light. Light will flash when voltage falls to approxi- mately 10 to 11 volts.  If flashing occurs, battery must be recharged to 12 volts. 11 Clothing and Materials.  Wash fire resistant clothing and materials. 12 Recompression Chamber.  Wash inside and outside of chamber.  (Inside only after ex- tended operations.) 13 Check that Masks are installed or plug is Oxygen Mask not cleaned. installed.  Clean 02 Masks following use. Do not use until cleaned. 14 Gages.  Inspect for damaged pointers, Gages damaged or inopera- cracked lenses, loose tube connections or tive.  Do not operate until loose wires, loose hardware, plus proper repaired. operation and normal readings during operation. 15 Valves.  Inspect for proper operation.  Check Valves damaged or inopera- for looseness, damage and missing parts. tive. Change 1 2-13