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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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