777 AIRCRAFT MAINTENANCE MANUAL

PRESSURE REFUEL -INTRODUCTION

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PRESSURE REFUEL -GENERAL DESCRIPTION

General
The pressure refuel system transfers fuel from the refuel adapters to the airplane tanks. You operate the pressure refuel system with the IRP on the left wing. The FQPU and the ELMS control the system.
Fault information goes to the AIMS.
Control
The IRP sends fuel load data and refuel valve switch positions to the FQPU through an ARINC 429 data bus. The processor sends the switch positions to the ELMS through the systems ARINC 629 buses. The ELMS supplies power to open and close the refuel valves.
Indication
The ELMS monitors refuel valve positions. When a refuel valve is open, the ELMS sends a signal to the FQPU on the systems ARINC 629 buses. The FQPU makes the related valve-open light come on.
Overfill Protection
There is a surge tank float switch in each surge tank. If fuel enters the surge tank, the surge tank float switch sends a signal through the IRP to the ELMS. This causes the ELMS to remove power from all the refuel valves so the valves close.
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777 AIRCRAFT MAINTENANCE MANUAL

PRESSURE REFUEL -GENERAL DESCRIPTION

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D633W101-BEJ  Jan 05/2002 

PRESSURE REFUEL -COMPONENT LOCATIONS

General
The components for the pressure refuel system are:
*
Refuel station

*
Refuel valves

*
Refuel/jettison manifold

*
Refuel/jettison manifold drain valves

*
Refuel/jettison manifold vacuum relief valves.

Refuel Station
There is a refuel station on the leading edge of the left wing, outboard of the engine. The refuel station has an access door, two refuel adapters, and an IRP.
Refuel Valves
There are six refuel valves; two in each tank. The valve bodies are on the rear spar, inside the tanks. The valve actuators are on the rear spar, outside the tanks.
The refuel valve in the left side of the center tank is aft of the second fuel tank access door. The refuel valve in the right side of the center tank is in a similar position.
The inboard refuel valve in the left main tank is aft of the fourth fuel tank access door. The outboard refuel valve in the main tank is aft of the eighteenth fuel tank access door. The refuel valves in the right main tank are in similar positions.
Refuel/Jettison Manifold
The refuel/jettison manifold connects the refuel station to all the refuel valves. It supplies fuel from the refuel adapters to each tank.
Refuel/Jettison Manifold Drain Valves
There are two refuel/jettison manifold drain valves. One is in each half of the center tank. You get access to them through the first fuel tank access door.
Refuel/Jettison Manifold Vacuum Relief Valves
There are two refuel/jettison manifold vacuum relief valves. They are on the refuel/jettison manifold, near the outboard refuel valve in each main tank. You get access to them through the eighteenth fuel tank access door.
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D633W101-BEJ  Sep 05/2002 

777 AIRCRAFT MAINTENANCE MANUAL

PRESSURE REFUEL -COMPONENT LOCATIONS

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D633W101-BEJ  Jan 05/2002 

PRESSURE REFUEL -COMPONENT LOCATIONS -FRONT SPAR

Refuel Station
There is a refuel station on the left wing, aft of leading edge slat
5. The refuel station contains two refuel adapters and an IRP.
Surge Tank Float Switches
There is one surge tank float switch on each wing, near the pressure relief valve and vent scoop. The left switch is on the front spar, aft of leading edge slat 3. The right switch is on the front spar, aft of leading edge slat 12.
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PRESSURE REFUEL -COMPONENT LOCATIONS -FRONT SPAR

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PRESSURE REFUEL -COMPONENT LOCATIONS -REAR SPAR

General
There are two refuel valves in each fuel tank.
In the left main fuel tank, the inboard refuel valve actuator is outboard of the main landing gear shock strut. The outboard refuel valve is between the fairings of the outboard flap. The refuel valve actuators are in similar locations in the right main fuel tank.
　
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