TM 10-6640-239-13 4-9 Table 4-1.  Unit Preventive Maintenance Checks and Services (PMCS) – CONT Q - Quarterly     S - Semi-Annually     A - Annually     B-Bi-Annually Item No. Interval Item to Inspect Procedures Not Fully Mission Capable If: Q S A B i.    Check drain tubing, piping, valves and hose connections for good condition. Drain tubing, piping, valves and hose connections leak or have physical damage. j.    Check electric still for good condition. Water leaks from electric still, has missing or loose mounting hardware or fasteners, or loose or broken electrical connections. 12 Gas Alarm System Check gas alarm control unit and gas detector for good condition. Refer to TM 10-6665-297-13&P for further PMCS instructions. Gas alarm control unit and gas detector have physical damage, missing or loose mounting hardware or fasteners, or loose or broken electrical connections. 13 a.   Check wall cabinets for good condition.  Check bookcases for good condition. Cabinets have binding or jamming of drawers or doors, broken latches or hinges, or missing or loose fasteners.  Bookcases have binding or jamming of door, or missing or loose mounting hardware fasteners. Cabinet System b.   Check metal lockers for good condition. Lockers have binding or jammed doors, broken latches, or missing or loose mounting hardware fasteners. c.   Check desiccating cabinet for good condition. Desiccating cabinet has missing or loose mounting hardware fasteners, or damage to door gasket or relief valve.  Desiccating cabinet has broken glass. d.   Check fume chamber for good condition. Fume chamber has binding or jamming of door, missing or loose mounting hardware fasteners, or leaking fittings or air, vacuum, or water valves.