TM   5-5420-226-20-1 Symptom-53 DETAILED TROUBLESHOOTING PROCEDURE SUPPORT SYSTEM -  FIRE    EXTINGUISHERS r~ -- CAUTION.---- 1 1 ;o;ot   engage   control   valve  mount-   , I ing  nut  to   cylinder   while   doing   this L check. -- r ------ ---- J (Continued) ~    Check operation of   second shot   control valve when    exterior second shot    handle is  pulled. First Technician (Front of   Crew Compartment) l   Return second shot control valve    to   SET position. l   Hold   valve   away   from   and    above   second    shot cylinders. Second Technician (Front of   Vehicle) l First l Pull second shot exterior handle. Technician (Front of   Crew Compartment) Check if   pins in   control valves    did    extend. Did   pins   in  conttol valves extend? ‘  l   Repair   second   shot   control valve  (page   20-51). l   Install   safety   wire   and  lead seal  on  second   shot   exterior handle. ‘  l   Replacefire extinguisher cylinder(page 20-53). l   Installsafety wire and lead seal on second shot exterior handle. l   Installsafety wire and lead seal on second shot control valve. PIN< CONTROL VALVE SAFETY PIN REMOVED FOR CLARITY HANDLE TA107256 4-567