TM 9-2350-267-10VENTILATED FACE PIECE SYSTEM (VFPS) - ContinuedMaintenanceWARNINGCrew members are not authorized to change con-taminated filters.1. Notify Organizational Maintenance to change M12A1 gas filter and/or Ml 3particulate filter when one or more of the following conditions are observed:Physical damageWater immersionLow air flow to face pieces5,000-mile vehicle overhaul (peacetime operation)10,000 hours of vehicle operation (no chemical agents used - wartimeoperation)1500 hours (approximately 5 months) of vehicle operation (chemical agentsused - wartime operation)After each CK (cyanagen chloride - a blood agent) attackAt beginning of combat conditions and when use of CK is expected.2. Notify Organizational Maintenance to replace spring clip if:Clip is missing or damaged.Rubber gasket is missing or does not seal properly.PREPARATION FOR MOVEMENTBefore moving the M992, check to see that all systems and cargo compartments aresecured for travel. The following steps present specific items to be checked beforemoving.1. Make sure conveyor and stacker are properly stowed and secured (p 2-165and 2-171).2-206
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