Component Test
Dry Tank Capacitance and Insulation Resistance Values (at the Tank Wall)
Figure 504 (Sheet 1)
E44495
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A
747-400
MAINTENANCE MANUAL
NO. 2 AND 3 MAIN TANK
(AT THE TANK WALL - FRONT SPAR)
TABLE C
CENTER WING TANK
(AT THE TANK WALL - REAR SPAR)
TABLE D
Component Test
Dry Tank Capacitance and Insulation Resistance Values (at the Tank Wall)
Figure 504 (Sheet 2)
E44529
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A
747-400 MAINTENANCE MANUAL
H. Compensator and Tank Unit Test (at the FQPU)
S 865-085
(1)
Open these circuit breakers and attach a 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 865-166
(2) Open the electronics access door (125B) to get to the FQPU, M7860.
NOTE: The FQPU, M7860 is immediately forward of the access
____
door.
S 035-087
(3)
At the FQPU, M7860, loosen the eight captive screws on the access panel assembly and move the panel assembly down.
S 215-093
(4)
Make sure the LED indicator light on the individual fuel quantity circuit (IFQC) cards are not on.
S 015-094
CAUTION: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO REMOVE THE
_______ IFQC CARD. A FAILURE TO TO DO THE STEPS CORRECTLY CAN CAUSE DAMAGE TO THE EQUIPMENT.
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