28-21-00
ALL ú ú 04 Page 214 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 747-400 MAINTENANCE MANUAL
(3) S 912-044METHOD 3; Disable the overfill protection system:
WARNING:_______ WHEN YOU OPEN THE FUEL OVERFILL CONTROL CIRCUIT BREAKER, 415M14, THE OVERFILL PROTECTION SYSTEM IS DISABLED. IF AN OVERFILL CONDITION OCCURS, FUEL CAN OVERFLOW THE SURGE TANK AND A FUEL SPILL CAN OCCUR. A FUEL SPILL CAN CAUSE A FIRE OR AN EXPLOSION.
(a) (b) Open this circuit breaker and attach a DO-NOT-CLOSE tag: 1) P415 Power Distribution Center - Right a) 415M14 FUEL OVERFILL CONTROLThis method will allow a refueling operation with fuel in the surge tank.
(4) S 912-032Push the red OVERFILL RESET switch on the P42 panel.
(5) S 912-033Continue with the applicable alternate refueling procedure (AMM 12-11-06/301).
(6) S 912-047After you complete the refuel operation do these steps:
WARNING:_______ MAKE SURE TO CLOSE THE FUEL OVERFILL CONTROL CIRCUIT BREAKER. IF THE CIRCUIT BREAKER IS NOT CLOSED, THE OVERFILL PROTECTION SYSTEM IS DISABLED. THERE IS NO INDICATION FOR A DISABLED OVERFILL PROTECTION SYSTEM. IF THE CIRCUIT BREAKER IS OPENED DURING A SUBSEQUENT OVERFILL CONDITION, FUEL CAN OVERFLOW THE SURGE TANK AND A FUEL SPILL CAN OCCUR. A FUEL SPILL CAN CAUSE A FIRE OR AN EXPLOSION.
(a) Close this circuit breaker and remove the DO-NOT-CLOSE tag: 1) P415 Power Distribution Center - Right a) 415M14 FUEL OVERFILL CONTROL
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ALL ú ú 04 Page 215 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
PRESSURE FUELING SYSTEM - ADJUSTMENT/TEST
_________________________________________
1. General_______
A. This procedure has one task, a test to make sure the pressure fueling system (referred to as the pressure refuel system) operates correctly. You do this test while you refuel the airplane. This procedure does not have a test of the overfill shutoff operation because you must have an overfill condition to do that test. It is not necessary to adjust the pressure refuel system.
B. When persons do tasks near the wing leading edge, you must install safety locks on all of the extended leading edge flaps.
TASK 28-21-00-715-001
2. Pressure Fueling System Operational Test________________________________________
A. General
(1)
To do this test, you do a refuel operation that fills the fuel tanks until they are full. This test makes sure that the refuel valves are open when you supply electrical power and fuel pressure. This test also makes sure that the valves close when the fuel tanks are full.
(2)
The fuel for the PW4000 series engines must agree with the PWA-522 Specification.
(3)
Do not let fuel flow from the wingtip vents. If some fuel flows from the wingtip vents, stop the refuel operation immediately. A fire or explosion can occur. You must obey all of the approved refuel precautions during the pressure refuel operation.
B.
References
(1)
AMM 12-11-01/301, Fuel Servicing
(2)
AMM 20-41-01/201, Static Grounding
(3)
AMM 24-22-00/201, Manual Control
(4)
AMM 27-81-00/201, Leading Edge Flap System
(5)
AMM 28-21-32/501, Volumetric Top Off Adjustment Card
(6)
AMM 28-22-16/401, Fuel System Card File
(7)
AMM 28-26-00/201, Defueling
(8)
AMM 28-41-00/501, Fuel Quantity Indicating System
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ALL ú ú 05 Page 501 ú Feb 10/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
(9)
AMM 32-09-02/201, Air/Ground Relays
C.
Access
(1)
Location Zones 125 Area Below Forward Cargo Container Compartment, Left 221 Control Cabin, Left 222 Control Cabin, Right 521 Leading Edge to Front Spar, Left 621 Leading Edge to Front Spar, Right
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