747-400
MAINTENANCE MANUAL

FORWARD
CROSSFEED
BOOST
VALVE FOR

REFUEL VALVE FOR THE NO. 1 MAIN TANK
NOTE: LEFT WING SHOWN (RIGHT WING SIMILAR).
LEGEND:

MOTOR CONTROLLED VALVE
SOLENOID CONTROLLED PRESSURE ACTIVATED FUELING VALVE FUEL OUTLET FUEL INLET
PRESSURE SWITCH
(LOW PRESSURE INDICATION)

BOOST PUMP
CHECK VALVE DEFUEL VALVE AND RECEPTACLE
PRESSURE FUELING RECEPTACLE
Crossfeed Valve Fuel Flow Diagram
Figure 503

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F55142
A
747-400
MAINTENANCE MANUAL

 (5)  
AMM 28-22-16/401, Fuel System Card File

 (6)  
AMM 28-26-00/201, Defueling

 (7)  
AMM 28-41-00/501, Fuel Quantity Indication System

 (8)  
AMM 31-61-00/501, Integrated Display System (IDS)

 (9)  
AMM 32-09-02/201, Air/Ground Relays

 (10)
 AMM 34-61-02/401, Control Display Unit

 (11)
 AMM 45-10-00/501, Central Maintenance Computer (CMC)

 C.
Access

 (1)  
Location Zones
 221 Control Cabin, Left
 222 Control Cabin, Right
 521 Leading Edge to Front Spar, Left
 621 Leading Edge to Front Spar, Right

 (2)  
Access Panels
 521BB Refuel Station Access Door, Left
 521CB Refuel Control Panel Access Door
 621BB Refuel Station Access Door, Right

 D.
Preconditions

 S 865-495
 (1)  
These conditions are necessary for this task:

 (a)  
Fuel-Feed System serviceable.

 (b)  
A specific fuel quantity is necessary for this task.

 NOTE: This task transfers fuel between the main tanks.
____
 (c)  
Electrical Power On (AMM 24-22-00/201).

 (d)  
Fuel System Card File Serviceable (AMM 28-22-16/401).

 (e)  
Fuel Quantity Indication System (FQIS) serviceable (AMM 28-41-00/501).

 (f)  
Integrated Display System (IDS) serviceable (AMM 31-61-00/501).

 (g)  
Airplane must be in the ground mode (AMM 32-09-02/201).

 (h)  
CDU installed (AMM 34-61-02/401).

 (i)  
Central Maintenance Computer (CMC) serviceable (AMM 45-10-00/201).

 E.
Prepare for the Test

 S 865-227
 (1)  Use external power to supply the electrical power
 (AMM 24-22-00/201).

 NOTE: Do not use the APU to supply the electrical power.
____
 S 865-228
 (2)  Make sure the airplane is in the ground mode (the airplane is not jacked and the targets are not installed).
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747-400 MAINTENANCE MANUAL
 S 655-147
 (3)  
Make sure the fuel tanks contain these fuel quantities:

 (a)  
The center wing tank and the No. 2 and 3 reserve tank can contain some quantity of fuel.

 (b)  
The inboard and outboard main tanks: 1) each contain a minimum of 2500 lbs (1200 kgs) of fuel (enough fuel to operate the boost pumps)

 2)  are not completely full (to allow for fuel transfer between tanks).
 S 655-148
 (4)  If the fuel quantity is not sufficient, refuel the tank(s) (AMM 12-11-01/301), or move fuel from a different tank (AMM 28-26-00/201) if it is necessary.
 S 865-226
 WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE LEADING
_______ EDGE AND TRAILING EDGE FLAPS AND FLAP DRIVE MECHANISMS BEFORE YOU MOVE THE FLAP CONTROL LEVER. WITH HYDRAULIC POWER REMOVED, THE FLAPS WILL MOVE AUTOMATICALLY BY ELECTRICAL POWER WHEN YOU MOVE THE FLAP CONTROL LEVER.
　
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