Description and Operation
Cooling Air Crossover Duct
Cooling Air Fan
Cooling Air Inlet Duct
Cooling Air Shutoff Valve
Pneumatic Actuator
Cooling Air Fan Screen
Maintenance Practices
515
Feb 20/85 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Contents 49 Page 3
Subject Subject No.
APU Cooling Fan ..................................................................................................... 49-51-11 Removal/Installation
Cooling Air Shutoff Valve......................................................................................... 49-51-21 Removal/Installation Adjustment/Test
Cooling Air Shutoff Valve Pneumatic Line Filter ...................................................... 49-51-22 Removal/Installation Cleaning/Painting
Pneumatic Actuator.................................................................................................. 49-51-32 Removal/Installation
APU BLEED AIR SYSTEM ......................................................................................... 49-52-02
Description and Operation
APU Control Thermostat
Bleed Air Valve
Differential Air Pressure Regulator
Surge Bleed Valve
Bleed Air Valve ........................................................................................................ 49-52-11 Removal/Installation
Bleed Air Duct .......................................................................................................... 49-52-13 Removal/Installation
Differential Air Pressure Regulator .......................................................................... 49-52-21 Unit Servicing Removal/Installation Adjustment/Test
APU Control Thermostat.......................................................................................... 49-52-32 Removal/Installation Adjustment/Test
Surge Bleed Valve ................................................................................................... 49-52-41 Removal/Installation Adjustment/Test
Thermostat Selector Solenoid Valve ....................................................................... 49-52-61 Removal/Installation
APU Overtemperature Control Thermocouple......................................................... 49-52-71 Removal/Installation
Overtemperature Control Switch.............................................................................. 49-52-81 Removal/Installation Adjustment/Test
Compressor Discharge Pressure Orificed Tee........................................................ 49-52-91 Cleaning/Painting
Contents 49 May 01/98 Page 4 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
Subject Subject No.
ENGINE CONTROLS
APU CONTROLS........................................................................................................ 49-61-0
Description and Operation
APU Control Unit
Electronic Speed Switch
Low Oil Pressure Switch
Oil Temperature Switch
Sequencing Oil Pressure Switch
Tachometer Generator
APU Control Unit...................................................................................................... 49-61-11 Removal/Installation
Electronic Speed Switch .......................................................................................... 49-61-22 Removal/Installation
Sequencing Oil Pressure Switch ............................................................................. 49-61-41 Removal/Installation
Low Oil Pressure Switch .......................................................................................... 49-61-51 Removal/Installation
Tachometer Generator............................................................................................. 49-61-61 Removal/Installation Subject Subject No.
540
Feb 01/95 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Contents 49 Page 4A/4B
INDICATING................................................................................................................... 49-70-0 Description and Operation
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