21-CONTENTS
GUN Page 11 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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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___________
SENSOR - ZONE DUCT TEMPERATURE 21-61-16
Removal/Installation 401 ALL
SENSOR - ZONE TEMPERATURE 21-61-03
Removal/Installation 401 ALL
Cleaning/Painting 701 ALL
SWITCH - ZONE DUCT 21-61-07
OVERTEMPERATURE
Maintenance Practices 201 ALL
Adjustment/Test 501 ALL
VALVE - FLIGHT DECK FLOW 21-61-09
REGULATING
Removal/Installation 401 ALL
Adjustment/Test 501 ALL
VALVE - TRIM AIR PRESSURE 21-61-08
REGULATING AND SHUTOFF
Removal/Installation 401 ALL
VALVE - ZONE TRIM AIR MODULATING 21-61-10
Removal/Installation 401 ALL
AIR CONDITIONING PACK TEMPERATURE 21-62-00
CONTROL SYSTEM
Description and Operation 1 ALL
General 1
Controller - Pack Temperature 1
Door - Ram Air Exit and 4
Actuator
Door - Ram Air Inlet and 4
Actuator
Sensor - Temperature, Pack 6
Discharge
Valve - Turbine Bypass 4
Operation 6
ACTUATOR - RAM AIR INLET DOOR 21-62-03
Removal/Installation 401 ALL
ACUTATOR - RAM AIR EXIT DOOR 21-62-05
Removal/Installation 401 ALL
CONTROLLER - PACK TEMPERATURE 21-62-06
Removal/Installation 401 ALL
21-CONTENTS
GUN Page 12 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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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 ___________
DOOR - RAM AIR INLET 21-62-02 Removal/Installation 401 ALL Inspection/Check 601 ALL
SENSOR - PACK DISCHARGE 21-62-07 TEMPERATURE Removal/Installation 401 ALL SHAFT - RAM AIR INLET DOOR 21-62-11 TORQUE Removal/Installation 401 ALL SWITCH - RAM AIR EXIT DOOR LIMIT 21-62-12 Removal/Installation 401 ALL VALVE - ACM TURBINE BYPASS 21-62-01 Removal/Installation 401 ALL
21-CONTENTS
GUN Page 13 Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
AIR CONDITIONING - DESCRIPTION AND OPERATION
____________________________________________
1. General_______
A. Air conditioning system equipment is used to convert hot pneumatic manifold air to temperature controlled conditioned air at low pressure for distribution to the various airplane compartments for airplane pressurization and ventilation.
B. Three air conditioning packs with identical components cool the hot pneumatic air. In each pack pneumatic bleed air is metered through a flow control and shutoff valve and is cooled in a heat exchanger. The air is further cooled by an air cycle machine (ACM) as required by the pack temperature control system. Ram air is the cooling medium in the heat exchanger during flight. During operation on the ground, a fan on the air cycle machine moves air through the heat exchanger. The air cycle machine consits of a compressor, turbine and fan. Cooling is achieved by expansion through the turbine which drives the compressor and fan.
C. Cool air leaving each of the air conditioning packs flows to the main distribution manifold. This manifold mixes the air from the packs and distributes the air thru the risers to the flight deck, crew rest area, upper deck, and main deck.
D. Cool air from packs 2 and 3 can also be partially or totally diverted to the lower aft and lower forward cargo compartments, respectively.
E. Hot trim air, at existing pneumatic duct temperatures, is added to the cooled air going to the various airplane zones. Trim air is added as required to obtain the desired temperature for each zone. A trim air pressure regulating and shutoff valve controls the flow of pneumatic air into the trim air manifold. Individual trim air modulation valves regulate the flow of trim air into each zone duct.
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