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10
C
2
F185
F184
36.1
37.5
10
D
3
F189
F188
32.7
34.1
10
E
4
F183
F182
36.3
37.7
10
F
5
F193
F192
28.8
30.2
10
G
6
F191
F190
27.8
29.2
10
TANK UNITPSD 747-2
NO. 1
NO. 4
DRY CAPACITANCE
INSULATION
(PROBE) ORPROBE
MAIN TANK
MAIN TANK
(PICOFARADS)
RESISTANCE
COMPENSATORSELECT
EQUIPMENT
EQUIPMENT
(MEGOHMS)
MINIMUM MAXIMUM
SWITCH CMCS NUMBER
NUMBER
NUMBER
A
COMP
F155
F154
50.4
51.8
10
B
1
F179
F178
36.7
38.3
10
C
2
F177
F176
40.9
42.5
10
D
3
F175
F174
36.2
37.8
10
E
4
F171
F170
44.1
45.7
10
F
5
F169
F168
46.5
48.1
10
G
6
F173
F172
39.6
41.2
10
H
7
F165
F164
46.0
47.6
10
I
8
F167
F166
40.2
41.8
10
J
9
F159
F158
45.9
47.5
10
K
10
F163
F162
45.5
47.1
10
L
11
F161
F160
47.3
48.9
10
M
12
F153
F152
56.5
58.3
10
N
13
F157
F156
52.1
53.9
10
O
14
F151
F150
51.7
53.5
10
NO. 1 AND 4 MAIN TANK
DRY TANK CAPACITANCE AND INSULATION RESISTANCE VALUES
(AT THE TANK WALL - FRONT SPAR)
TABLE B

Component Test
Dry Tank Capacitance and Insulation Resistance Values (at the Tank Wall)
Figure 504 (Sheet 1)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
　
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