21-CONTENTS
 GUN Page 5 Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 CHAPTER 21 - AIR CONDITIONING
 TABLE OF CONTENTS
_________________
 Chapter Section Subject_______ Subject ____ Effectivity
_______ Page ___________
 Adjustment/Test 501 ALL DUCT - AFT CARGO HEAT 21-44-09 Approved Repairs 801 ALL SWITCH - AFT CARGO OVERHEAT 21-44-04 Removal/Installation 401 ALL SWITCH - AFT CARGO TEMPERATURE 21-44-02 CONTROL Removal/Installation 401 ALL SWITCH - AFT CARGO UNDERFLOOR 21-44-07 HEAT CONTROL Removal/Installation 401 ALL VALVES - AFT CARGO HEAT 21-44-01 Removal/Installation 401 ALL
 COOLING 21-50-00
_______
 Component Location 101 ALL
 Component Index
 Component Location

 21-CONTENTS
 GUN Page 6 Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 CHAPTER 21 - AIR CONDITIONING
 TABLE OF CONTENTS_________________
 Chapter
 Section
 Subject Subject_______ _______  Page____  Effectivity___________
 AIR CONDITIONING PACK SYSTEM 21-51-00
 Description and Operation  1  ALL
 General  1
 Aspirator - Water  9
 Bulb - Temperature, Compressor  9
 Discharge
 Collector - Water  10
 Conditioner - Signal  10
 Converter - Ozone, Catalytic  10
 Heat Exchanger  8
 Housing - Fan Diffuser and  8
 Inlet
 Machine - Air Cycle  8
 Sensor - Airflow  10
 Separator - Water  9
 Switch - Overheat, Compressor  9
 Discharge
 Switch - Overheat, Pack  9
 Discharge
 Valve - Check, Compressor  9
 Bypass
 Valve - Flow Control and  1
 Shutoff
 Valve - Pack Dump (SMACCS)  8
 Operation  10
 Adjustment/Test  501  ALL
 Ground Test  501
 Inspection/Check  601  ALL
 ASPIRATOR - WATER 21-51-11
 Removal/Installation  401  ALL
 Adjustment/Test  501  ALL
 BULB - COMPRESSOR DISCHARGE 21-51-19
 TEMPERATURE
 Removal/Installation  401  ALL
 COLLECTOR - WATER 21-51-25
 Removal/Installation  401  ALL
 CONDITIONER - AIRFLOW SIGNAL 21-51-17
 Removal/Installation  401  ALL

 21-CONTENTS
 GUN Page 7 Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 CHAPTER 21 - AIR CONDITIONING
 TABLE OF CONTENTS_________________
 Chapter
 Section
 Subject Subject_______ _______  Page____  Effectivity___________
 DUCTS - RAM AIR 21-51-12
 Removal/Installation  401  ALL
 Approved Repairs  801  ALL
 FAN DIFFUSER AND INLET HOUSING 21-51-07
 Removal/Installation  401  ALL
 FILTER - FLOW CONTROL AND 21-51-13
 SHUTOFF VALVE
 Removal/Installation  401  ALL
 HEAT EXCHANGER 21-51-03
 Removal/Installation  401  ALL
 Inspection/Check  601  ALL
 Cleaning/Painting  701  ALL
 MACHINE - AIR CYCLE 21-51-04
 Removal/Installation  401  ALL
 SCREEN - RAM-AIR 21-51-15
 Removal/Installation  401  ALL
 SENSOR - AIRFLOW 21-51-16
 Removal/Installation  401  ALL
 SWITCH - COMPRESSOR DISCHARGE 21-51-09
 OVERHEAT
 Maintenance Practices  201  ALL
 SWITCH - PACK DISCHARGE OVERHEAT 21-51-08
 Maintenance Practices  201  ALL
 VALVE - COMPRESSOR BYPASS CHECK 21-51-06
 Removal/Installation  401  ALL
 VALVE - COOLING AIR CHECK 21-51-14
 Removal/Installation  401  ALL
 Inspection/Check  601  ALL
 VALVE - FLOW CONTROL AND SHUTOFF 21-51-01
 Removal/Installation  401  ALL
 Adjustment/Test  501  ALL
 VALVE - PACK DUMP (SMACCS) 21-51-02
 Removal/Installation  401  ALL
　
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