79-CONTENTS
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D633W101-BEJ
Jan 05/2002
PW4000 SERIES ENGINES
777 AIRCRAFT MAINTENANCE MANUAL
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79-00-00
Page 1 D633W101-BEJ Sep 05/2002
OIL -INTRODUCTION
Purpose
The engine oil system supplies oil to lubricate, cool, and clean the engine bearings and gearboxes. The system also heats the engine fuel to prevent ice formation in the fuel. The oil system has these subsystems:
*
Storage
*
Distribution
*
Indicating.
Abbreviations and Acronyms
*
AGB -accessory gearbox
*
AIMS -airplane information management system
*
AOC -air to oil heat exchanger (cooler)
*
ARINC -aeronautical radio, inc.
*
C -celsius
*
EDIU -engine data interface unit
*
EEC -electronic engine control
*
EICAS -engine indication and crew alerting system
*
eng -engine
*
EPCS -electronic propulsion control system
*
filt -filter
*
fwd -forward
*
HPC -high pressure compressor
*
IDG -integrated drive generator
*
LPT -low pressure turbine
*
LVDT -linear variable differential transformer
*
MFD -multi-function display
*
MGB -main gearbox
*
PMA -permanent magnet alternator
*
press -pressure
*
psi -pounds per square inch
*
qty -quantity
*
ref -reference
*
RVDT -rotary variable differential transformer
*
temp -temperature
*
TVBC -turbine vane and blade cooling
EFFECTIVITY BEJ ALL 79-00-00
Page 2
D633W101-BEJ Sep 05/2002
PW4000 SERIES ENGINES
777 AIRCRAFT MAINTENANCE MANUAL
OIL -INTRODUCTION
EFFECTIVITY BEJ ALL 79-00-00
Page 3
D633W101-BEJ Sep 05/2002
OIL -GENERAL DESCRIPTION
Storage
The engine oil tank is the reservoir for the engine oil system. There are two ways to fill the tank: gravity fill or pressure fill.
Distribution
The distribution system has these parts:
*
Pressure
*
Scavenge
*
Breather.
Oil flows from the engine oil tank to the lubrication and scavenge oil pump. The lubrication pump does not control the oil output pressure. When the engine speed changes, the oil pressure changes.
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