21-CONTENTS
BEJ Page 9 Mar 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
CHAPTER 21 - AIR CONDITIONING
TABLE OF CONTENTS
_________________
Subject
_______
BLOWER - EQUIPMENT COOLING Removal/Installation CLEANER, AIR - EFIS COOLING Maintenance Practices Cleaning/Painting [*] APLS WITH EFIS
DETECTOR - EQUIPMENT COOLING AIRFLOW Removal/Installation [*] APLS WITHOUT EFIS
EQUIPMENT COOLING SYSTEM Cleaning/Painting FANS - EFIS COOLING Removal/Installation [*] AIRPLANES WITH EFIS
SENSOR - EFIS COOLING SYSTEM LOW FLOW Removal/Installation [*] AIRPLANES WITH EFIS
SENSOR - EQUIPMENT COOLING LOW FLOW Removal/Installation [*] APLS WITH EFIS
VALVE - AUTOMATIC FLOW CONTROL Removal/Installation
VALVES - EFIS COOLING CHECK
Maintenance Practices Cleaning Removal/Installation
[*] AIRPLANES WITH EFIS
VALVES, CHECK - EQUIPMENT
COOLING BLOWER Removal/Installation Inspection/Check
TEMPERATURE CONTROL
___________________ Chapter SectionSubject_______ Page____ Effectivity
21-58-12401 ALL
21-58-61201 [*]201
21-58-41
401 [*]
21-58-47701 ALL21-58-81401 [*]
21-58-45
401 [*]
21-58-43
401 [*]
21-58-31401 ALL
21-58-91201 [*]204201
21-58-51401 ALL601 ALL
21-60-00
21-CONTENTS
BEJ Page 10 Nov 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
CHAPTER 21 - AIR CONDITIONING
TABLE OF CONTENTS
_________________
Subject
_______
CONDITIONED AIR TEMPERATURE
CONTROL SYSTEM
Description and Operation General Air Mix Valve Temperature Controller Temperature Selectors Thermal Sensing Units Operation
Trouble Shooting Adjustment/Test Cleaning/Painting AIR MIX VALVE POSITION INDICATOR
CONTROL UNIT Description and Operation CONTROLLER - TEMPERATURE Removal/Installation FAN - PASSENGER CABIN TEMPERATURE SENSOR Removal/Installation FAN, SENSOR - CONTROL CABIN TEMPERATURE
Removal/Installation
INDICATOR - AIR MIX VALVE
Removal/Installation
INDICATOR - CABIN TEMPERATURE Removal/Installation MODULE - CABIN TEMPERATURE Removal/Installation SELECTOR - CABIN TEMPERATURE Removal/Installation SENSOR - CONTROL CABIN
TEMPERATURE Removal/Installation Inspection/Check
SENSOR - PASSENGER CABIN TEMPERATURE Removal/Installation
SENSORS - DUCT TEMPERATURE Removal/Installation Inspection/Check
SWITCHES - DUCT OVERHEAT Removal/Installation
Chapter SectionSubject_______ Page____ Effectivity
21-61-001 ALL167769
101 ALL501 ALL701 ALL
21-61-71
1 ALL21-61-81401 ALL21-61-34
401 ALL21-61-64
401 ALL21-61-02401 ALL21-61-03401 ALL21-61-01401 ALL21-61-07401 ALL21-61-61
401 ALL601 ALL21-61-31
401 ALL
21-61-41401 ALL601 ALL
21-61-51401 ALL
21-CONTENTS
BEJ Page 11 Nov 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
CHAPTER 21 - AIR CONDITIONING
TABLE OF CONTENTS
_________________
Chapter Section Subject_______ Subject ____ Effectivity
_______ Page ___________
UNIT - AIR MIX VALVE POSITION 21-61-71
INDICATOR CONTROL
Adjustment/Test 501 ALL
VALVE - AIR MIX 21-61-11
Removal/Installation 401 ALL
TEMPERATURE INDICATING SYSTEM 21-62-00
Description and Operation 1 ALL General 1 Temperature Bulbs 1 Operation 1
BULB, TEMPERATURE - CABIN AIR 21-62-15 SUPPLY Removal/Installation 401 ALL BULB, TEMPERATURE - PASSENGER 21-62-25 CABIN Removal/Installation 401 ALL
21-CONTENTS
BEJ Page 12 Nov 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
AIR CONDITIONING - DESCRIPTION AND OPERATION
____________________________________________
1. General (Fig. 1, Fig. 2, Fig. 3)_______
A. The air conditioning systems provide conditioned air to the control cabin, passenger cabin, electronic equipment compartment, forward cargo compartment, air conditioning distribution bay and aft cargo compartment. Air supply to the air conditioning system is furnished by the pneumatic system (chapter 36) from either engine bleed air or the auxiliary power unit (APU) in flight; from engine bleed air, APU bleed air, ground pneumatic supply cart, or from a ground conditioned air supply cart during ground operation. Part of the warm air supply from the engines or pneumatic cart is passed through air conditioning packs to be cooled. The cold air is then mixed with the remainder of the warm air as required to obtain the conditioned air temperature called for by the temperature control system. This conditioned air then passes into the control and passenger cabins through the distribution system. Galley and toilet vents, and equipment cooling on the ground exhaust cabin air without regard for cabin pressurization control requirements. The combined flow from all outlets is limited to a value less than that which enters the cabin from the air conditioning system. The outflow valves are regulated to exhaust only that additional quantity of air required to maintain the desired pressure in the cabin.
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