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A
747-400
MAINTENANCE MANUAL
NO. 2 MAIN FORWARD BOOST PUMP
NOTE: LEFT SIDE HYDROMECHANICAL FUEL SCAVENGE SYSTEM SHOWN. THE RIGHT SIDE IS ALMOST THE SAME.
Defueling Flow Diagram (Main Boost Pumps Operating)
Figure 3
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F49468
A
747-400 FAULT ISOLATION/MAINT MANUAL
DEFUELING
COMPONENT FIG. 102 SHT QTY ACCESS/AREA REFERENCE
VALVE - LEFT WING DEFUELING CHECK VALVE - LEFT WING MANUAL DEFUELING VALVE - RIGHT WING DEFUELING CHECK VALVE - RIGHT WING MANUAL DEFUELING 2 2 2 2 1 1 1 1 546AB, LEFT FRONT SPAR TO MID SPAR OUTBD MAIN TANK 521BB, PRESSURE FUELING STATION 646AB, RIGHT FRONT SPAR TO MID SPAR OUTBD MAIN TANK 621BB, PRESSURE FUELING STATION 28-26-02 28-26-01 28-26-02 28-26-01
Defueling - Component Index
Figure 101
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747-400
FAULT ISOLATION/MAINT MANUAL
PRESSURE
REFUEL
STATION
SEE A
PRESSURE
REFUEL
STATION
SEE A
REFUEL
STATION
DOOR (REF)
RECEPTACLE SHT 2BSEE SHT 2SEE C VALVE DEFUELING FWD RECEPTACLE SHT 2BSEE
PRESSURE REFUEL STATION
A
Defueling - Component Location Figure 102 (Sheet 1)
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747-400
FAULT ISOLATION/MAINT MANUAL
LEVER RECEPTACLE ADAPTER
B RECEPTACLE
WING MANUAL DEFUELING VALVE TO THE RECEPTACLE FUELING
VALVE
THE FUEL FROM CROSSFEED WING (REF) HANDLE CONTROL
MANIFOLD DEFUELING
CHECK VALVE FRONT
SPAR (REF)
DEFUELING VALVE
C
Defueling - Component Location (Details From Sht 1)
Figure 102 (Sheet 2)
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747-400 MAINTENANCE MANUAL
DEFUELING - MAINTENANCE PRACTICES
_________________________________
1. General_______
A. This procedure contains these tasks:
(1)
Pressure Defueling
(2)
Tank to Tank Fuel Transfer
(3)
Defueling With the External Power Control Unit
(4)
Lateral Fuel Imbalance Limits
B.
You must obey all of these safety precautions:
(1)
The safety precautions for defueling in this manual (in this procedure and in AMM 12-11-01/301, Fuel Servicing).
(2)
The safety precautions that the airport tells you to do
(3)
The safety precautions that the airline tells you to do.
C.
Center of Gravity Changes During Defueling and Fuel Transfer
(1)
When you defuel or transfer fuel the center of gravity (CG) will change. Always refer to the Weight and Balance Manual for specific fuel loads limits on the airplane. If you cannot keep the airplane within the CG limits of the Weight and Balance Manual, you must use tail support.
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