TM 1-1520-238-T-7
10–160.14
Change 5
10–48A.
FUEL QUANTITY SYSTEM – CAPACITANCE AND INDICATING TEST
10–48A
(USING PSD 60-1AF TEST SET) (cont)
Task
Result
r. On T cable (fig. 10–70.7), set DC OUT
switch to #2/AFT.
s. On pilot ELEC PWR panel (fig. 10–70.3),
set BATT/EXT PWR switch to EXT PWR.
t. On pilot center circuit breaker panel (fig.
10–70.4), close FUEL FILL circuit breaker.
NOTE
Some fuel signal conditioner covers have slots to allow potentiometer
adjustment without removing the cover.
u. If a fuel signal conditioner potentiometer
requires adjustment, loosen potentiometer
adjustment slot cover and slide cover back
to expose slots or remove cover. Rotate
potentiometer counterclockwise to decrease
or clockwise to increase indication.
v. Identify (A308) fuel signal conditioner TK E
trimmer for aft tank calibration.
w. Verify DC voltage reading on multimeter is 0
0.5 VDC.
If DC voltage reading on multimeter is not 0 0.5 VDC
adjust fuel signal conditioner TK2 E to obtain 0 0.5
VDC.
x. Verify digital readouts of CPG selectable
digital display (fig. 10–70.9) and pilot fuel
quantity indicator TOTAL digital readout and
both vertical scales indicate 0 to 10.
If CPG selectable digital display RIGHT/AFT digital
readout and pilot fuel quantity indicator TOTAL digital
readout and AFT vertical scale do not indicate 0 to
10, adjust fuel signal conditioner TK2 E to obtain 0 to
10 fuel indication.
y. On test set (fig. 10–70.5) select FUNCT
switch to SIM TU ONLY. Verify DC voltage
reading on multimeter is 5.0 0.5 VDC.
If DC voltage reading on multimeter is not 5.0 0.5
VDC adjust fuel signal conditioner TK2 F to obtain 5.0
0.5 VDC.
z. Verify CPG selectable digital display
RIGHT/AFT digital readout and pilot fuel
quantity indicator TOTAL digital readout and
AFT vertical scale indicate 1450 30.
If CPG selectable digital display RIGHT/AFT digital
readout and pilot fuel quantity indicator TOTAL digital
readout and AFT vertical scale do not indicate 1450
30, adjust fuel signal conditioner TK2 F to obtain
1450 30 fuel indication.
aa. Set test set FUNCT switch to AIRCRAFT
ONLY.
