(2)
Overwing Refueling
B. Overwing Refueling
(1)
Overwing refueling lets the operator add fuel to the four main fuel tanks. Fuel is added through the fill ports found on top of the wings. Fuel is transferred to the reserve tanks and center wing tank (CWT).
(2)
The overwing refuel of the main tanks can be done if the pressure refuel equipment, or the electrical power is not available. With the electrical power available, the fuel quantity can be monitored from the flight compartment or the P42 refuel control panel. With no electrical power available, the fuel quantity can be monitored with the fuel measuring sticks.
(3)
The fuel quantity processor unit (FQPU) does not control the fuel distribution or volumetric top off (VTO). You must stop the overwing refuel operation before the tank overfills.
(4)
You must monitor the fuel distribution to prevent an out of limits center of gravity (CG) or lateral imbalance condition.
TASK 12-11-04-603-043
2. Overwing Refueling (Fig. 301)__________________
A. References
(1)
AMM 07-11-08/201, Cargo and Fuel Loading Support
(2)
AMM 12-11-01/301, Fuel Service
(3)
AMM 20-11-33/201, Safety Harness
(4)
AMM 20-41-01/201, Static Grounding
(5)
AMM 27-81-00/201, Leading Edge Flap System
(6)
AMM 28-26-00/201, Defuel
B. Access
(1)
Location Zones
221 Control Cabin, Left
222 Control Cabin, Right
500 Left Wing
521 Leading Edge to Front Spar, Left
600 Right Wing
621 Leading Edge to Front Spar, Right
(2)
Access Panels
521BB Fueling Station Access Door
521CB Fueling Control Panel Access Door
621BB Fueling Station Access Door
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12-11-04
ALL ú ú 04 Page 301 ú Oct 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
OVERWING
FILL PORT
SEE A
FILLER CAP
LANYARD NOTE:____ FILLER CAP IS SHOWN REMOVED.
PORT FILL
UPPER WING SKIN
A OVERWING FILL PORT
Figure 301 Overwing Fill Port Locations
M26658
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12-11-04
ALL ú ú 01 Page 302 ú Oct 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
C. Prepare the Airplane for an Overwing Refuel Operation
S 653-001
WARNING: OBEY ALL THE FUEL SERVICING PRECAUTIONS IN AMM 12-11-01/301.
_______ FAILURE TO OBEY THE PRECAUTIONS CAN CAUSE SERIOUS INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
(1)
Read and obey the precautions in this task: Precautions and Limits for Fuel Servicing (AMM 12-11-01/301).
S 863-002
(2)
Supply electrical power (AMM 24-22-00/201).
S 863-003
(3)
Do not operate the APU during an overwing refuel operation.
S 863-004
(4)
Make sure the airplane is in a 0.5° nose down and a 0.0° roll attitude (| 2.0° pitch and roll).
S 683-005
(5)
Sump the water from the fuel tanks before you refuel the airplane (AMM 12-11-10/301).
S 863-006
(6)
Make sure these components are in the closed position:
(a)
Wing pressure relief valves (4 locations)
(b)
Landing gear doors
(c)
Overwing entry doors (passenger and combi airplanes only).
S 483-007
WARNING:_______INSTALL THE LOCKS ON ALL EXTENDED LEADING EDGE FLAPS. THIS WILL PREVENT INJURY FROM AN ACCIDENTAL OPERATION OF THE FLAPS.
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