REFUEL
DEFUELING RECEPTACLE
LINE
REFUEL
RECEPTACLE

SEE B
FWD
MANUAL SHUTOFF
VALVE HANDLE

OUTBD
FUELING CROSSOVER MANIFOLD
PRESSURE REFUEL STATION
DEFUEL
LEVER

A SEE C REFUEL RECEPTACLE ADAPTER
DEFUEL LEVER DEFUEL LEVER IN THE INCORRECT IN THE CORRECT POSITION (STOWED) POSITION (STOWED)
DEFUEL LEVER
C
Defueling System Controls Figure 201
E89446
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A
747-400 MAINTENANCE MANUAL
 (b)  
Outboard mains - 35 U.S. gallons (135 liters)

 (c)  
Inboard mains - 25 U.S. gallons (95 liters)

 (d)  
Center wing tank - 125 U.S. gallons (475 liters)

 D.
Access

 (1)  
Location Zones
 521 Leading Edge, Front Spar to Rear Spar, Left
 621 Leading Edge, Front Spar to Rear Spar, Right

 (2)  
Access Panels
 521BB Fueling Receptacle Access Panel
 521CB Fueling Control Panel Access Panel
 621BB Fueling Receptacle Access Panel

 E.
Defuel Operation Precautions

 S 652-302
 WARNING: DO NOT OPERATE HF COMMUNICATIONS SYSTEM OR WEATHER RADAR DURING
_______ THE DEFUELING OPERATIONS. THE HF COMMUNICATION SYSTEM OR WEATHER RADAR COULD CAUSE AN EXPLOSION TO OCCUR.
 (1)  Do not operate the HF communication system or weather radar during defueling operations.
 S 652-301
 WARNING: DO NOT CONNECT A HEADSET AND DO NOT TOUCH CONNECTIONS TO THE
_______ AIRPLANE DURING ATMOSPHERIC ELECTRICAL ACTIVITY OR STRONG RADIATIVE FIELDS. LIGHTNING STRIKES AND HIGH DISCHARGE CURRENTS CAN CAUSE SEVERE INJURY.
 (2)  
Do not connect a headset and do not touch connections to the airplane during atmospheric electrical activity or strong radiative fields.

 S 652-303

 (3)  
When thunderstorms or lightning are within a 10 mile (16 kilometer) radius of the immediate area, the defueling procedure should stop.

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747-400 MAINTENANCE MANUAL
 S 652-304
 (4)  
Strong wind conditions can cause a build-up of static electricity. Large charges of static electricity can develop on support equipment while parked as a result of the movement of dust particles and air currents during strong wind conditions. Strong wind conditions can also cause the unwanted movement of items or equipment which can hit the airplane or injure persons. Defueling procedures should stop if strong wind conditions are present.

 S 482-305

 (5)  
You must follow the limits shown in AMM 10-11-03/201, when you use the tail support stanchion in high winds.

 F.
Prepare for the Defuel Operation

 S 652-249
 (1)  If the planned defuel operation will cause the fuel load in the left and right wing to be unequal, then do this task: Lateral Fuel Imbalance Limits.
 S 482-243
 WARNING: DO THE PROCEDURE IN AMM 32-00-30/201 TO INSTALL THE DOOR LOCKS.
_______ THE DOORS OPEN AND CLOSE QUICKLY AND CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (2)  Install the door locks for the wing and body landing gear
 (AMM 32-00-30/201).

 S 862-247
 WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE LE
_______ AND TE 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. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (3)  Make sure persons and equipment are clear of the leading and trailing edge flaps.
 S 482-244
 WARNING: DO THE PROCEDURE IN AMM 27-81-00/201 TO DEACTIVATE THE LEADING
_______ EDGE FLAPS. ACCIDENTAL OPERATION OF THE FLAPS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
　
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