TM   5-5420-226-20-1 ( Symptom-55 DETAILED TROUBLESHOOTING PROCEDURE SUPPORT SYSTEM -  GAS   PARTICULATE {Continued) ~ WARNING — Unit   commander or   senior officer in charge    of  maintenance personnel as- signed to remove and dispose of contaminated gas filters must prescribe necessary clothing (TM  10- 277)  to  be  worn   during   this  operation. He    must also prescribe necessary safety    measures that   must   be  follow- ed   including decontamination oper- ation   that   must   be  performed before new gas filters are installed (TM3- 220). ~  Check   for  restricted airflow at gas  particulate filter   air outlet. Second Technician (Operator’s Station) l   Set   GAS   PARTICULATE switch OFF. First Technician (Commander’s Station) l   Disconnect    faulty   air   hose   from   gas   particulate precleaned. Second Technician (Operator’s Station) l   Set   GAS   PARTICULATE switch ON. First Technician (Commander’s Station) l   Hold   hand    over    filter    unit    outlet   to   air   hose   and   check for   free   airflow. Second Technician (Operator’s Station) l   Set   MASTER BATTERY switch OFF. l   Set   GAS   PARTICLTLATE switch OFF. Is  there    free    airflow from    filter    unit? Servicegas particulatefilter unit. OUTLET HOSES PRECLEANED AND   PARTICULATE FILTER UNIT l   Remove blockage from    faulty air   hose. l   If blockage cannot be removed repiace faulty air hose. / v TA107269 4-580