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12-11-06
ALL ú ú 01 Page 310 ú Oct 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
TASK 12-11-06-603-040
4. Refuel Operation - OVERFILL Light Comes On, Refuel Operation Stops
__________________________________________________________________
A. General
(1)
Do this procedure if the overfill protection system stops the refueling operation (the red OVERFILL protection light comes on).
(2)
When fuel enters the surge tanks, the overfill protection system commands the fuel quantity processor unit (FQPU) to close all of the refuel valves.
(3)
The refuel valves will remain closed until fuel is removed from the surge tank and the OVERFILL RESET switch is pushed.
(4)
Make sure the refuel valve(s) for the tank with an overfill remain closed when you begin the refuel operation again.
(5)
This task is a manual pressure refuel operation. The FQPU does not control the fuel load distribution during a manual pressure refuel operation. You must monitor the fuel distribution to prevent an out of limits center of gravity (CG) or lateral imbalance condition.
(6)
Troubleshooting for this condition is given in this FIM procedure:
(a) Overfill or Overboard Fuel Spill During a Refuel Operation (FIM 28-21-00/101).
B. References
(1)
AMM 12-11-03/301, Manual Pressure Refuel
(2)
AMM 28-21-00/201, Refuel
(3)
AMM 28-26-00/201, Defuel
(4)
FIM 28-21-00/101, Refuel
C. Access
(1)
Location Zones
500 Left Wing
600 Right Wing
(2)
Access Panels
521BB Fueling Station Access Door
521CB Fueling Control Panel Access Door
621BB Fueling Station Access Door
D. Airplane Precautions
S 653-041
WARNING: OBEY ALL THE FUEL SERVICING AND MANUAL PRESSURE REFUEL
_______ 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).
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
12-11-06
ALL ú ú 01 Page 311 ú Oct 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
E. Stop the Refuel Operation After an Overfill Indication
S 653-042
(1)
When the red OVERFILL light comes on, the FQPU will command all of the refuel valves to the closed position.
S 653-043
(2)
Release the deadman switch to stop the fuel flow.
S 653-044
(3)
Put the ALL VALVES switch to the CLOSED position (if opened).
S 653-045
(4)
Put the individual refuel valve switches to the CLOSED position (if opened).
S 653-046
(5)
Find out which fuel tank is overfilled.
S 653-047
(6)
Do this task: Remove Fuel From the Surge Tank (AMM 28-21-00/201).
F. Begin the Refuel Operation Again
S 653-048
(1)
Push the red OVERFILL RESET switch on the P42 panel.
S 653-049
(2)
Make sure the refuel valve(s) for the overfilled tank remain closed.
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