TM 10-6640-215-13 Table 4-1.  Unit Preventive Maintenance Checks and Services Item Interval Item To Be Procedure Not Fully Mission No. Checked Or Serviced Capable If: 11 Quarterly Gas Alarm NOTE System Refer to TM 10-6665-297- 13&P for further PMCS instructions. Check gas alarm control unit and gas detector for damage.  Check mounting hardware and electrical connections. Alarm control unit and gas detector damaged.  Mounting hardware is loose or missing, electrical connections loose 12 Quarterly Cabinet System a.  Check wall cabinets for binding or jamming drawers.  Check hinges, latches, and mounting hardware or missing. Drawers jam or bind. Latches or hinges broken. Mounting hardware is loose b.  Check desiccating cabinets, Cabinets, door gasket, or door gasket, and relief valve for damage.  Check mounting hardware. relief valve damaged. Mounting hardware is loose or missing c.  Check fume chamber for binding or jamming door and fitting or valves for leaks.  Check mounting hardware. . Door is binding or jamming, fittings or valves leak.  Mounting hardware loose or missing. 13 Semi- Propane Locker Check vents for bent or broken Vent screens are bent or Annually Vents screens. broken. 14 Semi- Annually Electrical System a.  Check emergency light ballast boxes for loose electrical connec tions or missing fasteners. Electrical connections are loose; fasteners loose or missing. b.  Check explosive proof distribu tion boxes for loose electrical con nections or missing fasteners. Electrical connections are loose; fasteners loose or missing. c.  Check all wall switches and Covers damaged, fasteners electrical receptacles for damaged covers, missing fasteners, and loose or broken electrical connections. loose or missing, or electrical connections loose or broken. d.  Check all ECU remote controls Knobs or fasteners loose or for missing control knobs and fas teners, and loose or broken electrical connections. missing, or electrical connections loose or broken. 15 Semi- Annually Cabinet System Check metal lockers for binding or jamming doors, broken latches, and loose or missing mounting hard- ware. Doors bind or jam, latches broken, or mounting hardware loose or missing 16 Semi Annually Cabinet System Check bookcases for binding or jamming doors and loose or missing mounting hardware Doors bind or jam, or mounting hardware loose or missing. 4-9/(4-10 blank)