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 1.  General_______
 A.  This procedure contains instructions to remove and install the fuel quantity tank units. The procedure is the same for all installations, only the location is different.
 B.  Tank units are found in each fuel tank, installed on brackets attached to the wing structure. Figure 401 identifies each tank unit by electrical equipment number, as used in the WDM, and by probe number, as used in the CMC.
 C.  Access to the tank units is through the applicable fuel tank access doors shown in Fig. 401.
 TASK 28-41-01-004-001
 2.  Fuel Quantity Tank Unit Removal (Fig. 402)_______________________________
 A.  References
 (1)
AMM 28-11-00/201, Fuel Tanks

 (2)
AMM 28-11-02/401, Reserve and Main Tank Access Door

 (3)
AMM 28-11-09/401, Spanwise Beam Access Door

 (4)
AMM 28-26-00/201, Defueling

 (5)
AIPC 28-41-01 Fig. 2

 (6)
AIPC 28-41-01 Fig. 3

 (7)
AIPC 28-41-01 Fig. 5

 (8)
SSM 28-41-03, 28-41-04, 28-41-05

 (9)
WDM 28-41-21, 28-41-22, 28-41-23, 28-41-24

 B.  
Access

 (1)  
Location Zones 131 Center Section Wing Box, Left 132 Center Section Wing Box, Right 541 Inbd Main Tank (Part), Front Spar to Mid Spar, Left 542 Inbd Main Tank (Part), Front Spar to Mid Spar, Left 543 Outbd Main Tank (Part), Front Spar to Mid Spar, Left 544 Inbd Main Tank (Part), Mid Spar to Rear Spar, Left 545 Inbd Main Tank (Part), Mid Spar to Rear Spar, Left 546 Outbd Main Tank (Part), Mid Spar to Rear Spar, Left 551 Outbd Main Tank (Part), Front Spar to Mid Spar, Left 552 Outbd Main Tank (Part), Mid Spar to Rear Spar, Left 553 Reserve Tank, Front Spar to Rear Spar, Left 641 Inbd Main Tank (Part), Front Spar to Mid Spar, Right 642 Inbd Main Tank (Part), Front Spar to Mid Spar, Right 643 Outbd Main Tank (Part), Front Spar to Mid Spar, Right 644 Inbd Main Tank (Part), Mid Spar to Rear Spar, Right 645 Inbd Main Tank (Part), Mid Spar to Rear Spar, Right 646 Outbd Main Tank (Part), Mid Spar to Rear Spar, Right 651 Outbd Main Tank (Part), Front Spar to Mid Spar, Right 652 Outbd Main Tank (Part), Mid Spar to Rear Spar, Right 653 Reserve Tank, Front Spar to Rear Spar, Right

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 28-41-01
 ALL  ú ú 03 Page 401 ú Feb 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

F179
NO. 1 MAIN TANK
TANK UNIT  PROBE NUMBER  ACCESS DOOR 
F151  14  546AB, MIDSPAR, RIB 
F153  12  546AB, RIB 
F157  13  546AB, MIDSPAR, RIB 
F159  9  546AB, MIDSPAR, RIB 
F161  11  546AB, RIB 
F163  10  546AB, RIB 
F165  7  546BB, MIDSPAR 
F167  8  546BB 
F169  5  552AB 
F171  4  552CB 
F173  6  552CB, MIDSPAR 
F175  3  552EB 
F177  2  552FB, MIDSPAR 
F179  1  552GB, RIB 

Fuel Quantity Tank Unit Location
Figure 401 (Sheet 1)

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 28-41-01
 ALL  ú ú 01 Page 402 ú Oct 10/89
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

F133
F129
F145
NO. 2 MAIN TANK
TANK UNIT  PROBE NUMBER  ACCESS DOOR 
F129  11  544AB, MIDSPAR, RIB 
F131  10  544AB, MIDSPAR, RIB 
F133  6  544AB, MIDSPAR, RIB 
F135  7  544AB, MIDSPAR 
F137  9  544AB 
F139  4  545AB, MIDSPAR, RIB 
F141  8  545AB, RIB 
F143  1  545BB, MIDSPAR, RIB 
F145  3  545BB, RIB 
F147  5  545BB, RIB 
F149  2  545BB, MIDSPAR, RIB 

Fuel Quantity Tank Unit Location
Figure 401 (Sheet 2)

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