TM 5-5420-226-20-1 Symptom-53 DETAILED TROUBLESHOOTING PROCEDURE SUPPORT SYSTEM -  FIRE    EXTINGUISHERS (Continued) r .-  L --CAUTION. ---- 1 I Donotengage   control   valve  mount-   I I ingnutto cylinder   while   doing   this I I check. L . . r ----- -0--- ~ z   Check   operation    of  first  shot  control   valve   when I exterior first    shot    handle is  pulled. I First Technician (Front of   Crew Compartment) l   Return first shot control valve    to   set   position. . Hold control valve    away from and    above first    shot cylinder. Second Technician (Front of   Vehicle) l   Pull   first    shot   exterior handle. First Technician (Front of   Crew Compartment) l   Check    if   pin   in   control valve    did    extend. Did   pin   in  control valve extend? l   Repair   first   shot  control valve (page   20-51). l   Installsafety wire and lead . seals on first shot exterior handle. )_{l   Replacefire extinguisher} cylinder   (page   20-53). l   Installsafety wire and lead seal on first shot exterior handle. l   Install  safety wire and.lead seals on first shot control valve. o^NO oYES u PINZ CONTROL VALVE SAFETY PIN REMOVED FOR CLARITY I HANDLE TA107252 4-563