TM 55-1560-307-13&P GENERAL SAFETY INSTRUCTIONS WARNING ELECTRICAL    GROUNDING    OF    THE HELICOPTER. Army regulations require the grounding of the helicopter when   parked   and   during   all   fueling and defueling operations. No electrical switches    shall    be    operated    except those  necessary  for  servicing  during fueling and defueling.  No smoking or flame  during  all  fueling  and  defueling operations. CAUTION Do     not     move     coupling     levers     to opened    position    with    hose    or    tee couplings while couplings are disconnected. NOTE · Hose   and   tee   coupling   lock   levers have  to  be  in  closed  position  when disconnected. · Couplings will not unlock if lock levers are not moved from closed position. REMOVAL 1. Place  clean  rags  (item  3,  Appx  D)  under  hose  to tee connections. 2. Remove tee coupling. a. Unlock    hose    couplings    at    hose    to    be disconnected first. b. Twist    hose    coupling    counterclockwise    to remove from tee coupling. 3. Remove all hoses attached to tee coupling in the same manner and remove tee fitting. INSPECTION 1. Visually   inspect   new   tee   coupling   for   obvious damage. 2. Replace   tee   coupling   if   above   conditions   are found. INSTALLATION NOTE After    tee    is    installed,    ensure    that coupling levers are open. 1. Close     hose     couplings     by     turning     levers     to UNLOCK position to close valves. 2. Twist hose coupling clockwise on to tee coupling, and turn levers to open position. 3. Secure all hoses attached to tee. 3-17.  MAINTENANCE OF FMCP COMPONENTS. REPLACE FUEL SENSOR LEVEL ELECTRO OPTICAL. This task covers: a.  Removal. b.  Inspection. c.  Installation. INITIAL SETUP Tools: Bonney Wrenches Material /Parts: Sensor Level Electro Optical (7, Fig C-7), Appx C Equipment Conditions: Refer to Figure 3-7. ERFS tank cam lever CLOSED. Suction hose assembly coupling closed. Refer to Figure 1-1, No.  14. All electrical power OFF. All FMCP switches OFF. 3-22