TM 55-1510-219-10 1. Open the access door on the upper cowling   to   gain   access   to   the   oil filler cap and dipstick. CAUTION A cold oil check is unreliable.  If possible, check  oil  within  10  minutes  after  engine shutdown.        If    over    10    minutes    have elapsed, motor the engine (starter only) for 15-20  seconds,  then  recheck.    If  over  10 hours  have  elapsed,  start  the  engine  and run  for  2  minutes,  then  recheck.    Add  oil as required.  Do not overfill. 2. Remove oil filler cap. 3. Insert a clean funnel, with a  screen incorporated, into the filler neck. 4. Replenish  with  oil  to  within  1  quart below MAX mark or the MAX COLD on   dipstick   (cold   engine).      Fill   to MAX or MAX HOT (hot engine). 5. Check   oil   filler   cap   for   damaged preformed packing, general condition and locking. CAUTION Insure    that    oil    filler    cap    is    correctly installed  and  securely  locked  to  prevent loss of oil and possible engine failure. 6. If   oil   level   is   over   2   quarts   low, motor   or   run   engine   as   required, and service as necessary. 7. Install and secure oil filler cap. 8. Check for any oil leaks. 2-93.    SERVICING  HYDRAULIC    BRAKE    SYSTEM RESERVOIR. 1. Gain    access    to    brake    hydraulic system reservoir. 2. Remove brake reservoir cap and fill reservoir  to  washer  on  dipstick  with hydraulic fluid. 3. Install brake reservoir cap. 2-94.  INFLATING TIRES. Inflate tires as follows: 1. Inflate  nose  wheel  tires  to  a  pressure between 55 and.60 PSI. 2. Inflate  main  wheel  tires  to  a  pressure between 73 and 77 PSI. 2-95.  SERVICING THE ELECTRIC TOILET. 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.  Instructions are as follows: a. Tank Removal. 1. Open   front   access   to   the   toilet,   as applicable, to remove the toilet tank. 2. Depress 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 top. b. Tank Cleaning. 1. Dispose  of  tank  contents  by  holding the tank upside-down over a sewer or toilet and pull 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. 2-81