(14)
 Compare the measured dry capacitance values and resistance values for the tank units and the compensator with the values shown in Figure 506.

 (a)  
If the capacitance and resistance values from the FQIS wire bundle connector at the tank wall and FQPU, M7860, are satisfactory, the FQIS wiring and FQIS components in the tank operate correctly.

 (b)  
If the capacitance or resistance values are not satisfactory at the FQIS wire bundle connector at the tank wall and the FQPU, M7860, the problem is in the fuel tank.

 (c)  
If the capacitance or resistance values are satisfactory at the FQIS wire bundle connector at the tank wall, but are not satisfactory at the FQPU, M7860, the problem is in the FQIS wiring between the FQIS connector at the tank wall and the FQPU, M7860.

 (d)  
Replace or repair these items to correct the FQIS problem: 1) Fuel quantity processor unit, M7860 (AMM 28-41-13/401) 2) Fuel quantity tank unit (AMM 28-41-01/401) 3) Fuel quantity compensator (AMM 28-41-02/401) 4) FQIS in-tank wire bundle (AMM 28-41-09/401) 5) Airplane FQIS wire bundle between the FQPU, M7860, and the

 FQIS wire bundle connector at the tank wall (SSM 28-41-03, SSM 28-41-04, SSM 28-41-05, WDM 28-41-21, WDM 28-41-22, WDM 28-41-23, WDM 28-41-24).
 S 085-182
 (15) Remove the PSD747-21 circuit card adapter from the slot of the applicable IFQC card.
 S 425-304
 CAUTION: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO INSTALL
_______ THE IFQC CARD. A FAILURE TO DO THE STEPS CORRECTLY CAN CAUSE DAMAGE TO THE EQUIPMENT.
 (16)
 Do this task to install the applicable IFQC card in the card file: "ESDS Circuit Card Installation" (AMM 20-41-02/201).

 (17)
 Remove the test equipment.

 S 435-270

 (18)
 At the FQPU, M7860, tighten the eight captive screws on the access panel assembly.

 S 085-243
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747-400 MAINTENANCE MANUAL
 S 435-271
 (19)
 Go out of and close the electronics access door (125B).

 S 865-105

 (20)
 Close these circuit breakers and remove the DO-NOT-CLOSE tag:

 (a)  
On the main power distribution panel, P6:
 1) 6D5, FUEL QTY 1
 2) 6D6, FUEL QTY 2

 (b)  
On the DC power distribution panel, P180:
 1) 180M9, FUELING PWR - HOT BAT
 2) 180C25, FUELING LTS PANEL
 3) 180C26, FUELING LTS RECP

 (c)  
On the left power distribution center, P414:
 1) 414F22, FUELING PWR

 S 745-106
 (21) Do this CMCS ground test:  <FUEL QUANTITY IND (Reference the Fuel Quantity Indicating System Operational Test).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400
MAINTENANCE MANUAL

SWITCH A SELECT PROBE PSD 747-2 C D E F B I  CMCS NUMBER COMP TANK UNIT (PROBE) OR COMPENSATOR 4 5 3 6 1 2  NO. 2 F181 F189 F191 F187 F183 F193 F185 RESERVE NUMBER TANK EQUIP  NO. 3 RESERVE NUMBER TANK EQUIP F180 F188 F190 F186 F182 F192 F184  MAXIMUMMINIMUM DRY CAPACITANCE (PICOFARADS) 50.4 32.7 27.8 31.1 36.3 28.8 36.1 51.8 34.1 29.2 32.5 37.7 30.2 37.5  INSULATION RESISTANCE (MEGOHMS) 10 10 10 10 10 10 10 

NO. 2 AND 3 RESERVE TANK
(AT THE FQPU)
TABLE A

Component Test

Dry Tank Capacitance and Insulation Resistance Values (at the FQPU)

Figure 506 (Sheet 1)

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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