TM 10-8415-208-12 Table 2-1.  Operator Preventive Maintenance Checks and Services for the STEPO-I (Cont) B - Before Operation D - During Operation INTERVAL Item Item To Be Procedures Equipment Is No. Inspected Check For And Have Repaired Not Ready/ B D Or Adjusted As Necessary Available If: 30 • Face Piece Inspect for cuts, holes or any Cuts, holes or other damage. damage is found. 31 • Air Hoses Inspect hoses for cuts, holes or Cuts, holes or any other damage. damage is found. NOTE The CO₂ absorbent will be replaced after each use or every 12 months. 32 • CO₂ Ensure maintenance tag Maintenance tag is Absorbent indicates C0₂ absorbent is fresh. missing or outdated. 33 • Coolant Ensure canister is frozen. Canister is thawed. Canister 34 • Oxygen Bottle Ensure bottle is pressurized Bottle is below and indicates 2,400 PSIG. 2,400 PSIG. 35 • Adjustable Inspect webbing for rips, tears, Webbing is ripped or Straps missing or broken buckles and torn or buckles are cleanliness. broken or missing. Ice Vest (Rebreather System Mode) 36 • Drain Valve Ensure valve is closed. Valve is left open. 37 • Battery Ensure a battery is installed. Battery is missing. 38 • Coolant Bag Inspect bag for rips, tears or holes. Bag is punctured. NOTE The coolant bag holds four (4) pounds of cube or crushed ice or three (3) gel packs.  Gel packs require 8-10 hours to fully freeze and provide longer operating time.  Approximately one (1) quart of potable water is necessary to operate the ice vest. 39 • Ensure the required amount of Ice, frozen gel ice or gel packs and potable packs or water are water are installed. not installed. 2-11