TM 1-1500-204-23-3 2-8.  Fuel  Cell Repair (Amfuel, Firestone, Uniroyal). a. Fuel   Cell   Damage   Classification   and   Repair Limits.  (General Information) WARNING All   regulations   and   instructions for handling fuels shall be strictly observed. The   following   WARNINGS   and   CAUTIONS   shall   be observed  before  and  during  removal,  cleaning,  repair, and testing of fuel cells. WARNING To prevent asphyxiation from fuel, oil  and  alcohol  fumes,  you  must wear  protective  clothing,  i.e.,  an apron,  an  air  supplied  respirator, a  face  shield  and  rubber  gloves. Use an air compressor to continuously   pump   air   into   the tank   when   personnel   are   in   the tank.    Ground  the  air  hose  to  the tank.  Assign a person to monitor the person in the tank in the event he is overcome by fumes. WARNING Use   an   explosometer   to   insure safe   conditions   in   the   fuel   cell before starting work. WARNING Acetone  and  repair  adhesives  are flammable  and  toxic.    Keep  away from heat, sparks and open flame. Wear  safety  glasses,  gloves  and protective     clothing     to     prevent contact.  Wear a NIOSH approved air-purifying respirator for organic vapors and work in a well ventilated area.  If contact occurs, flush   areas   with   water   and   get medical   attention.      If   ingestion occurs   get   medical   attention   at once. WARNING Work only in approved areas with adequate   ventilation   and   where emergency   equipment   can   move freely.  Initial deactivation must be done out-of-doors. WARNING Make sure fuel cell and all cleaning, repair, and test equipment are properly grounded. WARNING Do  not  enter  cell  unless  another person     is     available     as     safety monitor. WARNING Do   not   enter   fuel   cell   wearing shoes,    or    with    tools    in    your pockets. WARNING Do  not  allow  hot  work  lamps  to contact     fuel     cell.          Use     only explosion proof light. WARNING Purge fuel cell prior to inspection and repair.  Refer to paragraph 2- 5f (4) purging procedure. CAUTION Be careful when handling fuel cell at    temperatures    below    20°F    (- 6.67°C) to prevent cracking molded sections. CAUTION Do   not   expose   fuel   cell   to   any source  of  strong  light  for  a  long period. CAUTION Do not puncture or scratch lining of  fuel  cell.    If  lining  is  broken, fuel penetrates and activates self- sealing   layers.      Activated   layers swell   and   trap   fuel.      Activated green spongy material also contaminates   fuel   system.      This makes it necessary to replace fuel cell and flush fuel system. Change 2  2-55