Quantity
Unit - Tank, Fuel Quantity 1
Operation 13
Component Location 101 ALL Component Index Component Location
Adjustment/Test 501 ALL BUNDLE - WIRE, FUEL QUANTITY 28-41-09 INDICATING SYSTEM Removal/Installation 401 ALL CARDS - CHANNEL, INDIVIDUAL FUEL 28-41-15 QUANTITY Removal/Installation 401 ALL CARDS - INPUT/OUTPUT, FUEL 28-41-16 QUANTITY PROCESSOR Removal/Installation 401 ALL COMPENSATOR - FUEL QUANTITY 28-41-02 Removal/Installation 401 ALL DENSITOMETER - FUEL QUANTITY 28-41-11 Removal/Installation 401 ALL INDICATOR - FUEL QUANTITY 28-41-04 Removal/Installation 401 ALL UNIT - FUEL QUANTITY PROCESSOR 28-41-13 Removal/Installation 401 ALL UNIT - TANK, FUEL QUANTITY 28-41-01 Removal/Installation 401 ALL
28-CONTENTS
GUN Page 16 Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
CHAPTER 28 - FUEL
TABLE OF CONTENTS
_________________
Chapter Section Subject_______ Subject ____ Effectivity
_______ Page ___________
FUEL PRESSURE INDICATING SYSTEM 28-42-00
Description and Operation 1 ALL General 1 Lignt - Indicator, Fuel 1
Pressure
Switch - Fuel Pressure 1
Operation 6
Component Location 101 ALL Component Index Component Location
Adjustment/Test 501 ALL
SWITCH - PRESSURE 28-42-01
Removal/Installation 401 ALL
FUEL TEMPERATURE INDICATING SYSTEM
(Ref 73-32-00)
FUEL TEMPERATURE INDICATING SYSTEM 28-43-00
Description and Operation 1 ALL General 1 Bulb - Fuel Temperature 1 Operation 1
Adjustment/Test 501 ALL
BULB - FUEL TEMPERATURE 28-43-01
Removal/Installation 401 ALL
FUEL MEASURING STICK ASSEMBLY 28-44-00
Description and Operation 1 ALL General 1 Housing - Measuring Stick 1 Stick - Measuring 1 Operation 1
HOUSING - FUEL MEASURING STICK 28-44-02 Removal/Installation 401 ALL STICK - FUEL MEASURING 28-44-01 Removal/Installation 401 ALL
28-CONTENTS
GUN Page 17 Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
FUEL - DESCRIPTION AND OPERATION
________________________________
1. General_______
A. The airplane fuel system stores and distributes fuel for use by the engines and auxiliary power unit. Many portions of the fuel system are operated automatically by a fuel management system that monitors fuel quantities, fuel distribution in the tanks, and component status. Fuel system configuration can be displayed on the Engine Indicating and Crew Alerting System (EICAS) by selecting the fuel synoptic. The fuel system can signal fuel system flight conditions and/or faults to the flight crew through EICAS and can record flight conditions and faults in the Central Maintenance Computer System (CMCS) for aid in maintenance.
B. The fuel system is composed of four major subsystems:
(1)
Storage
(a)
The storage subsystem consists of the fuel tanks, a fuel tank ventilation system, and a means to transfer fuel from tank to tank within the airplane. Storage subsystem also includes sealing requirements for the fuel tanks.
(2)
Distribution
(a)
The distribution subsystem consists of the components and tubing necessary to deliver fuel to the engine and auxiliary power unit. Distribution subsystem also includes the refueling and defueling of the fuel tanks.
(3)
Jettison
(a)
The jettison subsystem consists of the components and fuel tubing necessary to jettison fuel overboard through nozzles on the wingtips.
(4)
Indicating
(a)
The indicating subsystem contains components necessary to provide fuel quantity indication by electronic or mechanical means. Quantity measurements determined by the indicating subsystem are used to automatically control fuel feed, transfer, refueling, and jettison operations. Indicating subsystem also contains components for indicating low fuel pressure in the fuel feed and jettison subsystem pumps.
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