TM 1-1510-218-10 2-131 3.   With  the  aircraft  empty  except  for  full fuel  and  oil,  inflate  the  nose  gear  until the   inner   cylinder   is   extended   3  to 3.5 inches. (3)   Main Gear Strut. 1.   Release    all    the    air    from    the    strut through  the  air  valve  and  remove  the core from the valve. 2.   Fully compress the strut and attach a small   hose   over   the   air   valve   and immerse  the  other  end  of  the  hose  in approved     hydraulic    fluid.         Slowly extending  the  strut  will  vacuum  the  oil into   the   cylinder.      Cycling  the  strut slightly as it is extended will expel any trapped air.   Return the strut slowly to the fully compressed position; this will force   the   excess   oil   back   into   the container and the strut will be properly filled with oil. 3.   With  the  aircraft  empty  except  for  full fuel  and  oil,  inflate  the  strut  until  the inner   cylinder   is   extended   5.56   to 5.93 inches. 2-108.  INFLATING TIRES. 1.   Inflate    nose    wheel    tire    to    a    pressure between 55 and 60 psi. 2.   C  Inflate  main  wheel  tires  to  a  pressure between 92 and 96 psi. 3.   DT  Inflate  main  wheel  tires  to  a  pressure between 60 and 64 psi. 2-109.  SERVICING   THE   ELECTRIC  TOILET    C   D (C-12 AIRCRAFT PRIOR TO C-12F SERIAL 86-60084). The   toilet   should   be   serviced   during   routine ground    maintenance    of    the    aircraft    following    any usage.   It  is  more  efficient  and  convenient  to  remove, clean, and recharge the toilet tank on a regular basis than    to    wait    until    the    tank    is    filled    to    capacity.   Instructions   for   servicing   are   provided   on   a   decal applied to the front side of the removable tank. a.   Tank Removal. 1.   Open     front     access     to     the     toilet     as applicable, to remove the toilet tank. 2.   Press the lock ring of the flush hose quick disconnect  coupling  located  on  the  right side at the front of the tank top. 3.   Drain any residue of flush fluid in the hose by partially disengaging the plug from the quick   disconnect   and   manipulating   the hose to assist drainage. 4.   Remove   the   flush   hose   from   the   quick disconnect and place hose in the retaining clip  located  on  the  underside  of  the  toilet mounting plate. 5.   Install    the    cap    attached    to    the    quick disconnect to seal the coupling. 6.   Close the knife valve at the bottom of the toilet bowl by pushing the actuator handle until the valve is fully closed. 7.   Press  the  two  fasteners  on  each  side  of the knife valve actuator to unlock the tank. 8.   Remove  the  tank  by  pulling  the  recessed carrying handle on the tank tip. b.  Tank Cleaning. 1.   Dispose  of  tank  contents  by  holding  the tank  upside-down  over  a  sewer  or  toilet and     pulling     the     knife     valve     actuator handle,   opening   the   valve   and   allowing the tank to drain. 2.   Rinse  the  tank  by  filling  one-half  full  with water.    Close  the  knife  valve  and  shake vigorously.  Drain tank as in previous step. NOTE Commercial   detergents   and   disinfectants can    be    included    in    the    rinse    water    if desired.      However,  do  not  include  these materials in the tank precharge. 3.   Rinse and drain the tank several times to ensure that the tank is thoroughly clean. 4.   Wipe   the   exterior   surfaces   of   the   tank using  a  cloth  moistened  with  clear  water and disinfectant. c.   Tank Precharge.