21-CONTENTS
 GUN Page 6 Jan 28/01 
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details. 
A 757 MAINTENANCE MANUAL
 CHAPTER 21 - AIR CONDITIONING
 TABLE OF CONTENTS_________________ 
 Chapter 
 Section 
 Subject Subject_______ _______  Page____  Effectivity___________ 
 PRESSURE RELIEF VALVES 21-32-00 
 Description and Operation  1  ALL 
 General  1 
 Component Details  1 
 Positive Pressure Relief  1 
 Valve 
 Vacuum Relief Valve  1 
 VALVE - POSITIVE PRESSURE RELIEF 21-32-01 
 Maintenance Practices  201  ALL 
 Install the Positive  201 
 Pressure Relief Valve 
 Positive Pressure Relief  210 
 Valve Test 
 Remove the Positive Pressure  201 
 Relief Valve 
 Replace the Relief Valve  207 
 Filter 
 Static System Leak Check - 206 
 Positive Pressure Relief 
 Valve 
 VALVE - VACUUM RELIEF 21-32-02 
 Maintenance Practices  201  ALL 
 Do the Vacuum Pressure  204 
 Relief Valve Test 
 Install the Relief Valve  203 
 Remove the Relief Valve  201 
 PRESSURIZATION INDICATION AND 21-33-00 
 WARNING SYSTEM 
 Description and Operation  1  ALL 
 General  1 
 Component Details  1 
 Altitude Switches  1 
 Differential Pressure Sensor  1 
 Pressurization and  1 
 Indication Warning Module 
 Operation  1 
 Adjustment/Test  501  ALL 
 System Test - Cabin Pressure  501 
 indication and Warning System 
 MODULE - PRESSURIZATION AND 21-33-01 
 INDICATION WARNING 
 Removal/Installation  401  ALL
21-CONTENTS
 GUN Page 7 May 28/00 
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details. 
A 
757 MAINTENANCE MANUAL
 CHAPTER 21 - AIR CONDITIONING
 TABLE OF CONTENTS_________________ 
 Chapter 
 Section 
 Subject Subject_______ _______  Page____  Effectivity___________ 
 SENSOR - DIFFERENTIAL PRESSURE 21-33-04 
 Removal/Installation  401  ALL 
 SWITCH - CABIN ALTITUDE WARNING 21-33-05 
 Removal/Installation  401  ALL 
 HEATING 21-40-00_______ 
 Component Location  101  ALL 
 Component Index 
 Component Location 
 FORWARD CARGO COMPARTMENT HEATING 21-43-00 
 SYSTEM 
 Description and Operation  1  ALL 
 General  1 
 Component Details  1 
 Forward Cargo Heating Flow  1 
 Fan 
 Forward Cargo Heating Inlet  3 
 Grill 
 Forward Cargo Temperature  3 
 Thermal Switch 
 Operation  3 
 Control  6 
 Functional Description  3 
 Adjustment/Test  501  ALL 
 Operational Test - Forward  501 
 Cargo Compartment Heating 
 System 
 System Test - Forward Cargo  503 
 Compartment Heating System 
 FAN - FORWARD CARGO HEATING FLOW 21-43-04 
 Removal/Installation  401  ALL 
 (TASK ORIENTED DATA)  401 
 SENSOR - FORWARD CARGO FAN 21-43-07 
 CURRENT 
 Removal/Installation  401  [*] 
 [*] GUN 001-010 
 SWITCH - FORWARD CARGO 21-43-05 
 TEMPERATURE CONTROL 
 Removal/Installation  401  ALL
 21-CONTENTS
 GUN Page 8 May 28/00 
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details. 
A  
757  
MAINTENANCE MANUAL 
 CHAPTER 21 - AIR CONDITIONING 
 TABLE OF CONTENTS_________________ 
 Chapter 
 Section 
 Subject Subject Page_______ _______ ____  Effectivity___________ 
 AFT CARGO COMPARTMENT HEATING 21-44-00 
 
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