TM   5-4220-231-14&P Table 2-2. Operator Preventive Maintenance Checks and Service For   Chamber Operations -  (Con't). B-Before D-During A-After W-Weekly ITEM INTERVAL ITEM   TO   BE   INSPECTED. Equipment is NO N Ready/ B D A W PROCEDURE Available If: 11 0 0 Flasks, HP    (11). Con't Fire   Damage Fire   damage is  evident by charring or burning of  the composite labels, paint, or    plastic components of  the valves. WARNING Before testing flask valves, ensure all   personnel are    clear of   area to   avoid possible injury   from flying    debris. DO   NOT    OPEN VALVE IF  ANY DAMAGE IS   DETECTED. Before opening valves, ensure protective caps have been removed from hose couplings. When inspecting valve    control, DO   NOT  OPEN    VALVE   FULLY. Failure to comply could result in  death or    injury   to personnel. Wear protective eyewear when inspecting HP   flask    to   avoid eye injury   due to flying debris. 12 0 0 Valves, HP   Flask (12). Inspect valve    for Any   damage damaged shaft, handle, and assembly. Replace is   noted. handle if  broken. 0 Partially open valve until   air   flow   is  confirmed. Close valve. o Inspect thermo relief   valve and pressure relief valve for   damage. 13 0 0 Valves (13). Check all  valve    control panel knobs Valve    controls for   operability. Turn    each control counterclock- are    jammed wise    one turn    (air   will  escape from hose coupler), or   broken. and then turn    it  clockwise to   the closed position. Controls are Replace control knob if missing or   broken. excessively tight    or   loose. 2-35