(2)
Manually Close the Refuel Valve
(3)
Put the VTO Switch to the Override Position
(4)
Put the VTO Switch to the Usual Position
(5)
Remove Fuel From the Surge Tank
B.
Refueling - Maintenance Tips
(1)
When you preselect a fuel quantity between 87,000 lbs and 88,000 lbs, (39,000 kgs and 40,000 kgs) the EICAS status message M2/M3 < 6K SIG can show 60 minutes after the refuel. The EICAS messages can occur when the usual fuel schedule distribution causes a M2/M3 single point sensors disagree condition (one tank sensor covered by fuel, the other tank sensor not covered). To clear the EICAS message, transfer the fuel to make sure M2/M3 single point sensors agree (both wet or both dry).
TASK 28-21-00-902-039
2. Manually Open the Refuel Valve (Fig. 201)______________________________
A. General
(1)
Do this task during a refuel operation if a refuel valve does not operate electrically.
(2)
There is no automatic refuel valve shutoff or overfill protection when a refuel valve is opened manually. If you put too much fuel into the tank, fuel will overfill the tank and enter the surge tank(s). If the fuel flow is not stopped, the surge tank will overfill and an overboard fuel spill will occur.
B.
References
(1)
AMM 12-11-06/301, Alternate Refueling Procedures
(2)
AMM 27-51-00/201, Trailing Edge Flap System
(3)
AMM 28-26-00/201, Defuel
(4)
AMM 32-00-30/201, Wing and Body Gear Door Locks
C.
Access
(1)
Location Zones
500 Left Wing
600 Right Wing
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28-21-00
ALL ú ú 05 Page 201 ú Oct 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
Refuel Valve Control Unit
Figure 201 (Sheet 1)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
28-21-00
ALL ú ú 01 Page 202 ú Oct 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
M26064
A
747-400
MAINTENANCE MANUAL
REFUEL VALVE ACCESS
BOTTOM VIEW OF THE LOWER WING SURFACE
(LEFT SIDE IS SHOWN, RIGHT SIDE IS OPPOSITE)
Refuel Valve Control Unit
Figure 201 (Sheet 2)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
28-21-00
ALL ú ú 01 Page 203 ú Oct 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
M26077
A
747-400
MAINTENANCE MANUAL
(2)
Access Panels
521BB Fueling Station Access Door
521CB Fueling Control Panel Access Door
621BB Fueling Station Access Door
571AB Trailing Edge Lower Access Panel
572GB Trailing Edge Lower Access Panel
581EB Flap Drive Access Panel
591AB Outbd Aileron Access Panel
671AB Trailing Edge Lower Access Panel
672GB Trailing Edge Lower Access Panel
681EB Flap Drive Access Panel
691AB Outbd Aileron Access Panel
D.
Prepare the Airplane
S 482-002
(1)
If it is necessary to manually open a CWT refuel valve, do these steps:
(a)
Make sure the ground lockpins for the landing gear are installed.
WARNING: MAKE SURE YOU OBEY THE INSTRUCTIONS IN AMM 32-00-30/201
_______ WHEN YOU INSTALL THE LOCKS. IF THE LOCKS ARE NOT CORRECTLY INSTALLED, THE FAST MOVEMENT OF THE DOORS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(b) Install the wing and body gear door locks (AMM 32-00-30/201).
S 482-004
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