TM   5-5420-226-20-1 Symptom-52 DETAILED TROUBLESHOOTING PROCEDURE SUPPORT SYSTEM -  FIRE    EXTINGUISHERS (Continued) r .- --CAUTION. ---- 1 [Do not  engage   control   valve  mount-   I 1   ing  nut  to   cylinder   while   doing   this 1 1   check. I I I I I L -- .[ ----- ----- J Check   operation    of  first   shot  control   valve   when FIRE PULL HARD handle is pulled. Second Technician (Front of   Crew Compartment) l   Return first shot control valve    to   set   position. l   Hold   control valve    away from and    above first    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. Did   pin  in  control valve extend? I l   Replacefirst shot control cable betweeninterior releasemechanismand control valve (page 20-17). l   Installsafety wire and lead seal on  Interiorrelease mechanism F_PIN ~ @ CONTROL VALVE SAFETY PIN 13s v REMOVED FOR CLARITY ,* ‘A — @ @ HAN”DLE d 1 TA107    246 4-557