TM 1-1520-238-T-7
10–160.10
Change 5
10–48A.
FUEL QUANTITY SYSTEM – CAPACITANCE AND INDICATING TEST
10–48A
(USING PSD 60-1AF TEST SET) (cont)
Task
Result
i. Set test set (fig. 10–70.5) TU SIMULATOR
decade to 002.
j. Adjust test set TU SIMULATOR vernier
knob until LCD indicator displays 38.5 pf.
If adjusted capacitance value is not within required
tolerance, replace test set.
k. Set test set FUNCT switch to AIRCRAFT
ONLY.
l. Attach T cable (fig. 10–70.7) connector P1
to fuel signal conditioner (A308)J1.
m. Select 0–10 VDC scale on multimeter.
Select multimeter to ON.
n. Attach multimeter leads to receptacles on T
cable. Attach multimeter positive lead to T
cable + receptacle. Attach multimeter
negative lead to T cable – receptacle.
o. On T cable, set DC OUT switch to #1/FWD.
p. On pilot ELEC PWR panel (fig. 10–70.3),
set BATT/EXT PWR switch to EXT PWR.
q. 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.
r. 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.
s. 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 TK1 E to obtain 0 0.5
VDC.
