CHAPTER 75 - AIR
 TABLE OF CONTENTS
_________________
 Chapter Section Subject_______ Subject ____ Effectivity
_______ Page ___________
 AIR 75-00-00
___
 Description and Operation 1 ALL
 General 1
 Operation 1

 Component Location 101 ALL
 Component Index
 Component Location

 ACCESSORY COOLING 75-20-00
_________________ ENGINE BEARING COOLING SYSTEM 75-22-00
 Description and Operation 1 ALL General 1 Cooler - No. 3 Bearing Buffer 2
 Air
 Operation 2
 COOLER - NO. 3 BEARING BUFFER 75-22-01
 AIR
 Removal/Installation 401 ALL
 ENGINE EXTERNAL ACCESSORIES 75-23-00
 COOLING

 Description and Operation 1 ALL General 1 Duct - Nacelle Zone 1
 Ventilation
 Switch - Barometric 1
 Valve - Shutoff, Nacelle Zone 1

 Ventilation
 Operation 5 Adjustment/Test 501 ALL DUCT- NACELLE ZONE VENTILATION 75-23-03
 Removal/Installation 401 ALL SWITCH - BAROMETRIC 75-23-04 Removal/Installation 401 ALL VALVE - SHUTOFF, NACELLE ZONE 75-23-02 VENTILATION Removal/Installation 401 ALL
 75-CONTENTS
 NGUN Page 1 Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
CHAPTER 75 - AIR
 TABLE OF CONTENTS
_________________
 Chapter Section
 Subject_______  Subject ____ Effectivity_______ Page ___________
 TURBINE COOLING SYSTEM  75-24-00
 Description and Operation 1 ALL General 1 Actuator - Air Valve, Turbine 7
 Case Cooling
 Cable - Air Valve Control, 7
 Turbine Case Cooling
 Collector - Turbine Case 1
 Cooling, High Pressure
 Collector - Turbine Case 1
 Cooling, Low Pressure
 Duct - Air, Turbine Vane 9

 Cooling
 Filter - Air, PS3 9
 Manifolds - Turbine Case 7

 Cooling, High Pressure
 Manifolds - Turbine Case 7

 Cooling, Low Pressure
 Solenoid - TVBCA Valve 8
 Solenoids - TVBCA Valve and 9

 TVCA Valve
 Switch - TVBCA Valve Position 9
 Valve - Air Shutoff, Turbine 1

 Case Cooling, High Pressure
 Valve - Air Shutoff, Turbine 1
 Case Cooling, Low Pressure
 Valve - Air, Turbine Vane and 7
 Blade Cooling
 Valve - Turbine Vane Cooling 8
 Air

 Operation 10 Maintenance Practices 201 ALL Adjustment/Test 501 ALL
 Adjustment - Turbine Case 501 Cooling System Inspection/Check 601 ALL
 75-CONTENTS
 NGUN Page 2 Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
CHAPTER 75 - AIR
 TABLE OF CONTENTS
_________________
 Chapter
 Section Subject_______ Subject ____ Effectivity
_______ Page ___________
 ACTUATOR - AIR VALVE, TURBINE 75-24-05
 CASE COOLING
 Removal/Installation 401 ALL
 CABLE - AIR VALVE CONTROL, 75-24-11
 TURBINE CASE COOLING
 Removal/Installation 401 ALL
 COLLECTOR - TURBINE CASE 75-24-06
 COOLING, HIGH PRESSURE
 Removal/Installation 401 ALL
 COLLECTOR - TURBINE CASE 75-24-08
 COOLING, LOW PRESSURE
 Removal/Installation 401 ALL
 DUCT - AIR, TURBINE VANE COOLING 75-24-02
 Removal/Installation 401 ALL
 MANIFOLDS - TURBINE CASE 75-24-07
 COOLING, HIGH PRESSURE
 Removal/Installation 401 ALL
 MANIFOLDS - TURBINE CASE 75-24-09
 COOLING, LOW PRESSURE
 Removal/Installation 401 ALL
 SOLENOID - TURBINE VANE AND 75-24-15
 BLADE COOLING AIR VALVE AND IDG
 AIR/OIL HEAT EXCHANGER VALVE
 OVERRIDE
 Removal/Installation 401 [*]
 [*] ENGINES WITH PHASE 3 CHANGES
 SOLENOID - TURBINE VANE COOLING 75-24-17
 AIR VALVE AND TURBINE VANE AND
 BLADE COOLING AIR VALVE
 Removal/Installation 401 [*]
 [*] ENGINES WITH PHASE 3 CHANGES
 SWITCH - AIR VALVE POSITION, 75-24-13 TURBINE VANE AND BLADE COOLING Removal/Installation 401 [*] [*] ENGINES WITH PHASE 3 CHANGES OR PRE-PW-SB 75-107
 75-CONTENTS
 NGUN Page 3 Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
CHAPTER 75 - AIR
　
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