TM 1-1510-224-10 WARNING During warm weather, open fuel caps slowly  to  prevent  being  sprayed  with fuel.  Care should be taken to prevent cuts   or   abrasions   while   inspecting the     exhaust     or     turbine     area     of engines  that  have  been  operated  on aviation gasoline. The exhaust deposits can cause lead poisoning. CAUTION Proper procedures for handling aircraft fuels cannot be over stressed.    Clean,  fresh  fuel  shall  be used  and  the  entrance  of  water  into the     fuel     storage     or     aircraft     fuel system must be kept to a minimum. When  conditions  permit,  the  aircraft shall  be  positioned  so  that  the  wind will  carry  the  fuel  vapors  away  from all  possible  sources  of  ignition.    The fueling  vehicle  shall  be  positioned  to maintain  a  minimum  distance  of  10 feet   from   any   part   of   the   aircraft, while maintaining a minimum distance    of    20    feet    between    the fueling    vehicle    and    the    fuel    filler point. a. Shut off unnecessary electrical equipment in the aircraft,   including   radar   and   radar   equipment.      The master  switch  may  be  left  on,  to  monitor  fuel  quantity gages,    but    shall    not    be    moved    during    the    fueling operation.  Do not allow operation of any electrical tools, such  as  drills  or  buffers,  in  or  near  the  aircraft  during fueling. b. Keep  fuel  servicing  nozzles  free  of  snow,  water, and mud at all times. c. Carefully  remove  snow,  water,  and  ice  from  the aircraft  fuel  filler  cap  area  before  removing  the  filler  cap (fig.    2-44).    Remove  only  one  aircraft  tank  filler  cap  at any  one  time,  and  replace  each  one  immediately  after the servicing operation is completed. d. Wipe    all    frost    from    fuel    filler    necks    before servicing the aircraft. e. Drain   water   from   fuel   tanks,   filter   cases,   and pumps   prior   to   first   flight   of   the   day.      Preheat,   when required, to ensure free fuel drainage. f. Avoid   dragging   the   fueling   hose   where   it   can damage the soft, flexible surface of the deice boots. g. Observe  NO SMOKING precautions. h. Prior to transferring fuel, ensure that  the hose is grounded to the aircraft. i. Wash off spilled fuel immediately. j. Handle  the  fuel  hose  and  nozzle  cautiously  to avoid damaging the wing skin. k. Do   not   conduct   fueling   operations   within   100 feet of energized airborne radar equipment or within 300 feet of energized ground radar equipment installations. I. Wear   only   nonsparking   shoes   near   aircraft   or fueling  equipment,  as  shoes  with  nailed  soles  or  metal heel plates can be a source of sparks. WARNING Prior  to  removing  the  fuel  tank  filler cap,   the   hose   nozzle   static   ground wire shall be attached to the grounding   sockets   located   adjacent to the filler opening. 2-91. FILLING FUEL TANKS. Fill tanks as follows: 1. Attach bonding cables to aircraft. 2. Attach  bonding  cable  from  hose  nozzle   to ground   socket   adjacent   to   fuel   tank   being filled. CAUTION Do  not  insert  fuel  nozzle  completely into fuel cell due to possible damage to bottom of fuel cell.  Nozzle should be   supported   and   inserted   straight down    to    prevent    damage    to    the antisiphon valve. 3. Remove fuel tank filler cap and fill main tank before filling corresponding auxiliary tanks. 4. Secure applicable fuel tank filler cap.  Make sure latch tab on cap is pointed aft. 5. Disconnect bonding cables from aircraft. 2-92. DRAINING MOISTURE FROM FUEL SYSTEM. Twelve (12) fuel drains are installed (plus two drains for   the   ferry   fuel   system,   when   installed)   to   remove sediment from the fuel system. 2-99