75-CONTENTS
Page 2
D633W101-BEJ
Jan 05/2004
CHAPTER 75
Engine Air PW
CH-SC-SU Subject Page Effectivity
75-33-00 AIR -THRUST BALANCE CONTROL -GENERAL DESCRIPTION 2 BEJ ALL
75-33-00 AIR -THRUST BALANCE CONTROL -THRUST BALANCE AIR 4 BEJ ALL
SHUTOFF VALVE
75-CONTENTS
Page 3
D633W101-BEJ
Sep 05/2003
PW4000 SERIES ENGINES
777 AIRCRAFT MAINTENANCE MANUAL
THIS PAGE IS INTENTIONALLY LEFT BLANK
75-00-00
Page 1 D633W101-BEJ Sep 05/2002
AIR -INTRODUCTION
Purpose
The engine air system controls the cooling air to the engine and the airflow through the compressors.
The cooling system supplies and controls the airflow for internal and external cooling. These are the cooling subsystems:
*
Engine external accessories cooling
*
Engine bearing cooling
*
Turbine case cooling
*
Turbine vane and blade cooling
The compressor control system controls the airflow through the low pressure compressor (LPC) and the high pressure compressor (HPC). The system also reduces the thrust loads on the No. 1 bearing. These are the compressor control subsystems:
*
Compressor stator vane control
*
Compressor bleed control
*
Thrust balance control.
BEJ ALL POST SB 777-71-0032
The compressor control system controls the airflow through the low pressure compressor (LPC) and the high pressure compressor (HPC). These are the compressor control subsystems:
* Compressor stator vane control * Compressor bleed control
BEJ ALL
Abbreviations and Acronyms
*
AIMS -airplane information management system
*
ARINC -aeronautical radio, inc.
*
bld -bleed
*
chan -channel
*
EDIU -engine data interface unit
*
EEC -electronic engine control
*
EPCS -electronic propulsion control system
*
FMV -fuel metering valve
*
HPC -high pressure compressor
*
HPT -high pressure turbine
*
LPC -low pressure compressor
*
LPT -low pressure turbine
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