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 (1)  Install the tail support equipment if you cannot keep the airplane center of gravity in the limits given in the weight and balance manual (AMM 07-11-08/201).
 S 654-039
 WARNING: YOU MUST DEFUEL THE CENTER WING TANK AND THE APPLICABLE MAIN
_______ TANK WHEN THE DISCHARGE CHECK VALVE IS REMOVED (REFER TO THE STEPS THAT FOLLOW). A FUEL SPILL CAN OCCUR WHEN FUEL FLOWS THROUGH THE JETTISON INTERCONNECT LINE FROM AN ADJACENT FUEL TANK. A FUEL SPILL CAN CAUSE INJURY TO PERSONS.
 (2)  Defuel the fuel tanks listed below for the applicable
 override/jettison pump (AMM 28-26-00/201). ~.............................................................................. | OVERRIDE/JETTISON PUMP | FUEL TANKS THAT MUST BE DEFUELED | ................................................................................ | NO. 2 MAIN TANK | NO. 2 MAIN TANK |CENTER WING TANK BELOW THE | | | |INLETS FOR THE OVERRIDE/JETTISON| | | |PUMPS (BELOW APPROXIMATELY 2000 | | | |POUNDS/900 KILOGRAMS) | ................................................................................ | NO. 3 MAIN TANK | NO. 3 MAIN TANK |CENTER WING TANK BELOW THE | | | |INLETS FOR THE OVERRIDE/JETTISON| | | |PUMPS (BELOW APPROXIMATELY 2000 | | | |POUNDS/900 KILOGRAMS) | ................................................................................
 | LEFT CENTER WING TANK  |CENTER WING TANK  |NO. 2 MAIN TANK BELOW THE LEVEL |
 |  |  |OF THE INLETS FOR THE OVERRIDE/ |
 |  |  |JETTISON PUMPS IN THE NO. 2  |
 |  |  |MAIN TANK (BELOW APPROXIMATELY  |
 |  |  |6000 POUNDS/2700 KILOGRAMS)  |

 ................................................................................ | RIGHT CENTER WING TANK |CENTER WING TANK |NO. 3 MAIN TANK BELOW THE LEVEL | | | |OF THE INLETS FOR THE OVERRIDE/ | | | |JETTISON PUMPS IN THE NO. 3 | | | |MAIN TANK (BELOW APPROXIMATELY | | | |6000 POUNDS/2700 KILOGRAMS) | 2..........................…..................…................................1
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 28-31-07
 ALL  ú ú 01 Page 402 ú Oct 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 014-047
 (3)  Remove the motor/impeller unit from the override/jettison pump (AMM 28-31-01/401).
 S 864-048
 WARNING: CAREFULLY DO ALL THE SAFETY PROCEDURES TO DEFUEL AND GO INTO
_______ THE FUEL TANKS. INJURY TO PERSONS AND DAMAGE TO EQUIPMENT CAN OCCUR IF YOU DO NOT OBEY THE SAFETY PROCEDURES.
 (4)  
Purge and go into the fuel tank (AMM 28-11-00/201).

 S 014-005

 (5)  
If you remove the override/jettison pump housing from the center wing tank, remove the spanwise beam access doors (AMM 28-11-09/401).

 (a)  
For the left override/jettison pump housing, remove the spanwise beam access doors 131AZ, 131BZ, 131CZ and 131DZ.

 (b)  
For the right override/jettison pump housing, remove the spanwise beam access doors 131AZ, 131BZ, 132AZ and 132BZ.

 S 034-006
 (6)  
Disconnect the discharge line at the coupling.

 S 034-026

 (7)  
Discard the O-rings.

 S 034-007

 (8)  
Disconnect the pump inlet line at the coupling.

 (9)  
Discard the O-ring.

 S 034-043

 (10)
 On the outside of the tank, do these steps:

 (a)  
Remove the sealant (if present) from the bonding jumper(s) where they attach to the mounting bolts.

 S 034-027
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 28-31-07
 ALL  ú ú 03 Page 403 ú Jun 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 (b)  
Remove the lockwire from the mounting bolts.

 (c)  
AIRPLANES WITH LOCKWIRE PROVISIONS; Remove the lockwire from the mounting bolts.

 S 034-028
 (11)
 Hold the override/jettison pump housing in the tank and do these steps:

 (a)  
From out of the fuel tank, remove the bolts and washers (8 locations) that attach the override/jettison pump housing to the spar.
　
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