777 AMM 飞机维护手册 飞行操纵 Fuel(10)

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Get access to the failed valve

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Use the manual override knob to open the valve

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Start the fueling source

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Look at the fuel quantity display

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Release the deadman switch on the fueling source to stop refueling when you get to the correct tank quantity

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Return the airplane to its normal condition.

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PRESSURE REFUEL -OPERATION

Refuel Procedure With Inoperative Fuel Quantity Display
This is a brief summary of the refuel procedure you can use if fuel quantity for a tank does not show on the refuel panel:
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Move the power switch to BATT

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If the quantity does not to show after 60 seconds, use the measuring sticks

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Use the conversion tables to find the fuel quantity in the tank

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Use the conversion tables to find what the stick indication should be for the refuel quantity

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Start the fueling source

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Close the tank valves when the stick indications show the required fuel quantity.

System Test
The system test is not necessary for refueling. To do the test, push the system test switch during refueling. During the system test, the refuel valves close two at a time. The refuel valve indicator light goes out when each valve closes. Then the valves automatically open two at a time. The system test takes less than 20 seconds.
If one or more of the refuel valve indicator lights does not go out, the FQIS processor unit has a fault. The processor can not automatically close the valve when the refuel procedure is done. You must close the valve with the refuel valve control switch on the IRP, or with the manual override knob on the refuel valve control unit.

EFFECTIVITY
BEJ ALL

Overfill Test
The overfill test is not necessary for refueling. To do this test, push the overfill test switch during refueling. During the test, all refuel valves close immediately and the refuel valve indicator lights go out. Move the overfill reset switch to the RESET position to open the valves again. You must move the overfill reset switch to the NORMAL position to arm the overfill protection again.
If the refuel valve indicator lights do not go out, the overfill system has a fault. The overfill system can not automatically close the refuel valves if fuel flows into the surge tank. You must close the valves with the refuel valve control switches or with the manual override knobs on the refuel valve control units.
Training Information Point
During refueling, if the FQPU can not make a good fuel quantity calculation, the message PUSH SET comes on in the FUEL QTY display. Also, the refuel valves for the applicable tank close. Push the load select set switch to continue refueling. The display will go off and only one refuel valve will open. If the failure is in a main tank, the inboard refuel valve opens. If the failure is in the center tank, the left center refuel valve opens.
When the display is off, there is no volumetric shutoff for that tank. You must use the refuel valve switch to close the refuel valve.
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PRESSURE REFUEL -OPERATION

A STOP indication can show in a LOAD SELECT window on the IRP for a tank. This means that the VSO has been exceeded by 100 gallons or more. The refueler should stop refueling. The STOP indication stays until the quantity in the tank is decreased to at or below the VSO level for that tank.
BEJ 001-007
The FQPU can command the refuel valves to the close position if there is a tank unit failure. The FQPU software will decrease the shutoff level to 3.2% below VSO.
BEJ 008-999
The FQPU can command the refuel valves to the close position if there is failure of tank unit 10, 17, 18, or 19. The FQPU software will decrease the shutoff level to 3.2% below VSO.
BEJ ALL
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777 AIRCRAFT MAINTENANCE MANUAL

PRESSURE REFUEL -OPERATION

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ENGINE FUEL FEED -INTRODUCTION

Purpose
The engine fuel feed system supplies fuel to the engines from the main and center tanks. You operate the engine feed system from the fuel panel on the P5 overhead panel.
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777 AIRCRAFT MAINTENANCE MANUAL