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Normal Operation -Climb
During climb, the lower left TVBC shutoff valve is used to keep the turbine cavity seal temperature in limits. The other two shutoff valves stay open to send air to the number 3 bearing buffer air cooler and to cool the 2nd through 5th stage vanes and the 2nd stage blades.
BEJ ALL POST SB 777-71-0032
Normal Operation -Cruise
During cruise, the upper left and the right TVBC shutoff valves will close. The lower left TVBC shutoff valve and the TVC air valve provide airflow to the vanes and keep the turbine cavity seal temperature in limits.
EFFECTIVITY BEJ ALL  75-25-00 
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D633W101-BEJ  Jan 05/2004 
BOEING PROPRIETARY -Copyright # -Unpublished Work -See title page for details. 

AIR -TVBC SYSTEM -FUNCTIONAL DESCRIPTION

BEJ ALL POST SB 777-71-0032 (Continued) BEJ ALL
Normal Operation -Cruise
During cruise, the upper left and the right TVBC shutoff valves will close. The lower left TVBC shutoff valve provides airflow to the 2nd stage vanes and keeps the turbine cavity seal temperature in limits.
BEJ ALL POST SB 777-71-0032
Non-normal Operation
A failure of the EEC torque motor signal, causes the TVC air valve actuator to fully open the TVC air valve.
The TVBC shutoff valves will open without a solenoid signal or PS3 servo air.
BEJ ALL
Non-normal Operation
The TVBC shutoff valves will open without a solenoid signal or PS3 servo air.
EFFECTIVITY BEJ ALL  75-25-00 
Page 16 
D633W101-BEJ  Jan 05/2004 

 

AIR -TVBC SYSTEM -FUNCTIONAL DESCRIPTION

EFFECTIVITY BEJ ALL POST SB 777-71-0032  75-25-00 
Page 17 
D633W101-BEJ  Jan 05/2004 

 

AIR -TVBC SYSTEM -FUNCTIONAL DESCRIPTION

EFFECTIVITY BEJ ALL  75-25-00 
Page 18 
D633W101-BEJ  Sep 05/2003 

PW4000 SERIES ENGINES

777 AIRCRAFT MAINTENANCE MANUAL

THIS PAGE IS INTENTIONALLY LEFT BLANK

75-31-00

Page 1 D633W101-BEJ Sep 05/2002

AIR -COMPRESSOR CONTROL -INTRODUCTION

Purpose
The air system controls the compressor airflow to increase the stability of the compressor. The compressor control system has these subsystems:
*
Compressor stator vane control

*
Compressor bleed control

*
Thrust balance control.

EFFECTIVITY BEJ ALL  75-31-00 
Page 2 
D633W101-BEJ  Sep 05/2002 

PW4000 SERIES ENGINES

777 AIRCRAFT MAINTENANCE MANUAL

AIR -COMPRESSOR CONTROL -INTRODUCTION

EFFECTIVITY BEJ ALL  75-31-00 
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D633W101-BEJ  Sep 05/2002 

AIR -COMPRESSOR STATOR VANE CONTROL -GENERAL DESCRIPTION

Purpose
　
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