TEST AND ADJUST FUEL QUANTITY INDICATOR USING PSD 60-1AF FUEL QUANTITY
PART II. CALIBRATION OF DIGITAL TOTAL FUEL
Read and observe all safety precautions listed
Ground aircraft to earth ground per approved
Open Left and Right Forward and Aft Fuel Tank
Disconnect the following connectors from the fuel
tank access panels 114PS518.
FWD RT AUX
FWD LT AUX
AFT RT AUX
AFT LT AUX
Verify that the following breakers are closed:
REV CUR CO
FUEL QTY XFEED
Connect fuel quantity tester CHASSIS jack (J-7)
to airframe ground between the Right Main and
Right Forward Aux fuel tanks located at STA 210.
Lift latches to unlock tester. Turn ON-OFF switch
to ON. If words "LO BAT" appear in upper left
corner of LCD display (Figure 11), replace
Allow a 3 minute warm up before using tester
to measure cable.
Connect PSDAF-106 "T" cable "MAIN & AUX
HIZ" lead to TANK UNITS HIZ terminal (J-5) on
tester (Figure 1).
Connect PSDAF-106 "T" cable "MAIN LOZ" lead
(Figure 10) to tester TANK UNITS LOZ terminal
(J-4) (Figure 1).
Rotate tester FUNCT switch (S-2) to MEASURE
Rotate tester SELECT switch (S-3) to the TU.
Read and record cable LOZ-HIZ capacitance
displayed on LCD. If capacitance exceeds .5 pf,
repair or replace interface cable.
Disconnect cable MAIN & AUX HIZ and MAIN
LOZ leads from tester TANK UNITS terminals.
Connect MAIN & AUX HIZ lead to INDICATOR
HIZ terminal (J-2) on tester (Figure 1).
Connect MAIN LOZ lead to INDICATOR LOZ
terminal (J-1) on tester (Figure 1).