CHAPTER
28
Fuel
CHAPTER 28 Fuel
28-CONTENTS
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FUEL SYSTEM -INTRODUCTION
General
The fuel system has these subsystems:
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Fuel storage
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Fuel indicating
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Pressure refuel
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Engine fuel feed
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APU fuel feed
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Jettison
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Defuel.
Fuel Storage
The fuel storage system has three fuel tanks: left and right main tanks, and a center tank.
Fuel Indicating
The fuel indicating system measures fuel quantity in the tanks. The primary display system (PDS) and the integrated refuel panel (IRP) indicators show fuel quantity. The fuel indicating system also measures fuel temperature and senses fuel pump outlet pressure.
Pressure Refuel
The pressure refuel system transfers fuel from the refuel adapters to the main and center tanks. You operate the refuel system with the integrated refuel panel.
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Engine Fuel Feed
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.
APU Fuel Feed
The APU fuel feed system normally supplies fuel to the APU. It can also supply fuel to the left engine feed manifold during an in-flight flameout.
Jettison
The fuel jettison system dumps fuel overboard to reduce the landing weight. You operate the jettison system from the fuel panel on the P5 overhead panel.
Defuel
The defuel system moves fuel from the airplane tanks to ground tanks or from one airplane tank into another. You operate the defuel system at the IRP and the P5 overhead panel.
Abbreviations and Acronyms
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AIMS -airplane information management system
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APU -auxiliary power unit
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ARINC -Aeronautical Radio, Inc.
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bat -battery
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batt -battery
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C -celsius
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FUEL SYSTEM -INTRODUCTION
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ccw -counterclockwise
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chan -channel
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ctr -center
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ctrl -control
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EEU -ELMS electronic unit
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EICAS -engine indication and crew alerting system
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ELCU -electrical load control unit
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ELMS -electrical load management system
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FTR -fuel-to-remain
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FQIS -fuel quantity indicating system
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FQPU -fuel quantity processor unit
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fwd -forward
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gnd -ground
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hdlg -handling
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I/O -input/output
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inbd -inboard
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ind -indicator
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IRP -integrated refuel panel
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isln -isolation
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jett -jettison
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kg -kilogram
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l -left
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lb -pound
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man -manual
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mgmt -management
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min -minimum
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MLW -maximum landing weight
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O/J -override/jettison
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OPAS -overhead panel ARINC 629 system * outbd -outboard
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PDS -primary display system
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pwr -power
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qty -quantity
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r -right
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rly -relay
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sel -select
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SOV -shutoff valve
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svc -service
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sw -switch
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temp -temperature
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vlv -valve
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VOS -velocity of sound
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VTO -volumetric top-off
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777 AIRCRAFT MAINTENANCE MANUAL
FUEL SYSTEM -INTRODUCTION
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FUEL STORAGE -INTRODUCTION
General
The fuel storage system holds the fuel necessary for engine and APU operation.
The fuel storage system also does these functions:
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Gives maintenance access
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Prevents large pressure differences
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Helps drain the fuel tanks.
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FUEL STORAGE -INTRODUCTION
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FUEL STORAGE -GENERAL DESCRIPTION -TANK ARRANGEMENT
Fuel Tank Arrangement
These are the three fuel storage tanks:
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