TM 1-1520-238-T-7
Change 8
10–159
10–48. FUEL QUANTITY SYSTEM – CAPACITANCE AND INDICATING TEST (cont)
10–48
(USING TF-579 TEST SET)
Task
Result
r. Verify digital readouts of CPG selectable
digital display (fig. 10–65) and pilot fuel
quantity indicator (fig. 10–63) TOTAL digital
readout and both vertical scales indicate 0
to 10.
If CPG selectable digital display TOTAL digital
readout and pilot fuel quantity indicator TOTAL digital
readout and vertical scales do not indicate 0 to 10,
adjust FSC for 0 to 10 fuel indication
(TM 1-1520-238-23).
If both pilot and CPG fuel indicators cannot be
adjusted to indicate between 0 to 10 using procedure
in FSC adjustment, go to paragraph 10–50 for FWD
fuel indication, or paragraph 10–51 for AFT fuel
indication.
s. On pilot ELEC PWR panel (fig. 10–69), set
BATT/EXT PWR switch to OFF.
t. Detach P937 from FSC and reinstall
harness adapter (fig. 10–68).
u. On pilot ELEC PWR panel, set BATT/EXT
PWR switch to EXT PWR.
v. On fuel quantity test set (fig. 10–70), set
switches as follows:
Switch
Position
RANGE SELECTOR
X1
FUNCTION SELECTOR
TEST IND-PROBE SET
ON/OFF power
ON
w. Loosen fuel quantity test set probe control
lock and adjust PROBE 25-250 MMF control
until the value indicated on CAPACITANCE
INDICATOR is 47.2 pf minus the TANK 2
adapter tank loop capacitance value
recorded during fuel quantity test set
calibration. Tighten probe control lock.
x. On fuel quantity test set, set FUNCTION
SELECTOR control to TEST IND-TEST. On
harness adapter, set TANK SELECT switch
to TANK 2.
