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Page Title: Fuel Tank Partially or Completely Fueled
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TM  55-4920-383-13&P c. Fuel  Tank  Partially  or  Completely  Fueled. Calibration  of  the  fuel  quantity  indicator  with  a  partially  or  completely  fueled  tank  is performed  by  simulating  the  nominal  values  of  capacitance  for  empty  and  full  indication. The  calibration  does  not  match  the  aircraft  indicator  to  the  actual  dry  value  of  the  aircraft tank  units.  Thus  the  manufacturing  tolerances  of  the  tank  units  are  not  cancelled  out  in  the calibration.  This  means  of  calibration  should  be  used  only  when  it  is  impractical  to  com- pletely  drain  the  fuel  tank  and  reduced  accuracy  can  be  tolerated. (1)  With  the  equipment  set  up  as  shown  in  figure  2-2,  position  Test  Set  switches  as follows: Switch Position ON/OFF  (20,  figure  2-1) ON DISPLAY  SELECT  (8) CAP  (pF) CAPACITANCE FUNCTION (1) SIM  SET-COMP (2)  Using  the  applicable  aircraft  technical  manual,  set  the  compensator  simulator to  the  dry  value  of  the  aircraft  compensator. (3)  Set  CAPACITANCE  FUNCTION  switch  (1)  to  SIM  SET-PROBE  position.  Using the  applicable  aircraft  technical  manual,  set  the  tank  unit  simulator  to  the  empty  value  of the  aircraft  tank  units. (4)  Set  CAPACITANCE  FUNCTION  switch  (1)  to  IND  TEST-SIM  position.  Adjust  the EMPTY  control  at  the  rear  of  the  aircraft  indicator  to (5)  Set  CAPACITANCE  FUNCTION  switch  (1)  to obtain  an  empty  indication. SIM   SET-COMP   position.   Using the  applicable  aircraft  technical  manual,  set  the  compensator  simulator  to  the  wet  value  of the   aircraft   compensator. (6)  Set  CAPACITANCE  FUNCTION  switch  (1)  to  SIM  SET-PROBE  position.  Using the  applicable  aircraft  technical  manual,  set  the  tank  unit  simulator  to  the  full  value  of  the 2-20

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