TM   5-5420-226  -20-1 Symptom-52 T DETAILED   TROUBLESHOOTING PROCEDURE SUPPORT   SYSTEM  -FIRE    EXTINGUISHERS “ (Continued) r .-  1-.CAUTION ----- 1 I Do   not   engage control Valve    IT)OUIIG i [ ing    nut   to   cylinder while doing this I I check. I I I I L ----- ----- --- J ~   Check operation of   second shot    Controi VdVe when FIRE    PULL    HARD handle is   pulled. Second Technician (Front of   Crew Compartment) l   Return second shot control valve    to   set   position. l   Hold   control valve    in   position above second shot cylinder. First Technician (Operator’s Station) l   Pull   FIRE PULL HARD handle. Second Technician (Front of   Crew Compartment) l   Check    if   pin    in   control valve    did    extend. l   Return first    and second shot control valves to   SET position. First Technician (Operator’s Station) l   Arm    release   mechanism for   first    shot. Did   pin   in  the   control   vaive   extend? ) l   Replacefire extinguisher cylinders(page 20-53). l   Instalisafety wire and iead seais on  interior release mechanism l   Installsafety wire and iead seais on  first shot and second shot control vaives T oYES r  Repiacesecond   shot   cabie between    FIRE   PULL  HARD handle   and  controi   vaive (page   20-17). I TA107248 4-559