-cabin air distribution and recirculation (Ref. 21-21-00),
 -cockpit air ventilation (Ref. 21-21-00),
 -lavatory/galley ventilation (Ref. 21-23-00),
 -individual air distribution (Ref. 21-24-00),
 -avionics equipment ventilation (Ref. 21-26-00),
 -
cargo compartment ventilation (Ref. 21-28-00).

 A.
 Cabin Air Distribution and Recirculation The cabin air distribution system supplies conditioned air to the cabin and to the cockpit. Cockpit and cabin main supply ducts come from the mixer unit, which is central element of the distribution system. In the mixer unit the fresh air from the air conditioning packs is mixed with a part of the exhaust air of the cabin and the underfloor area. This

R recirculated air is drawn by recirculation fans through recirculation R filters to the mixer unit.
 B. Cockpit Air Ventilation The cockpit-air ventilation system supplies temperature controlled and conditioned air to the cockpit. The airflow comes from the cabin air distribution system from the mixer unit in a separate duct. The air flows from air outlets and individual air outlets into the cockpit.
 C. Lavatory/Galley Ventilation The lavatory/galley ventilation system supplies the lavatories and galleys with sufficient temperature controlled and conditioned air. Air flows from the cabin into the lavatories and galleys. Air also flows into the lavatories from the cabin air distribution and recirculation system through individual air outlets. The air flows from the lavatories and galleys into an extraction duct in the area of the outflow valve and then out of the aircraft. An extraction fan gives the necessary airflow.
 D. Individual Air Distribution The individual air distribution system supplies temperature controlled and conditioned air from the cabin distribution and recirculation system to each passenger through individual air outlets.

 E. Avionics-Equipment Ventilation System
 The avionics equipment ventilation system makes sure that the avionics 
R  racks have a good flow of air for cooling. It operates in different 
R  configurations. These configurations are dependent on the ambient 
R  temperature, whether the aircraft is on ground, in flight or a system 
R  failure exists.
 F. Cargo Compartment Ventilation
 Cabin air is drawn into the cargo compartment through ducts which are
 installed in the lower fuselage. Outlets along the compartment left-hand
 sidewall direct the air towards the cargo floor area. The air is 
R  extracted from the compartment through outlets which are located near the 
R  compartment ceiling. An extraction fan gives the necessary air flow.

 DISTRIBUTION - MAINTENANCE PRACTICES
____________________________________
 TASK 21-20-00-010-001
 Removal of the Air-Conditioning Distribution Ducts
 WARNING : MAKE SURE THAT AIR IS NOT SUPPLIED TO THE AIR CONDITIONING SYSTEM
_______ FROM THE MAIN ENGINE, THE APU OR A GROUND SOURCE. HOT COMPRESSED AIR CAN CAUSE INJURY TO PERSONNEL.
 1. Reason for the Job
__________________
 Self Explanatory
 2. Job Set-up Information
______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific circuit breaker(s) safety clip(s) No specific platform 2 m (6 ft. 7 in.)
 B. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
24-41-00-861-002 Energize the Aircraft Electrical Circuits from the
 External Power 25-23-43-000-001 Removal of the Upper Sidewall Panel(s) 25-23-44-000-001 Removal of the Lower Sidewall Panels 25-54-12-000-001 Removal of the FWD Cargo Compartment Partition FR34 25-54-12-000-002 Removal of the Ceiling Panels in the FWD Cargo
 Compartment 25-54-12-000-003 Removal of the Sidewall Panels in the FWD Cargo
 Compartment 25-55-11-000-001 Removal of the AFT Cargo-Compartment Partition FR47 25-55-11-000-002 Removal of the Ceiling Panels in the AFT Cargo
 Compartment - FR47/FR59 25-55-11-000-003 Removal of the Sidewall Panels in the Aft Cargo Compartment - FR47/FR59 25-55-12-000-001 Removal of the AFT Cargo Compartment Partition FR65

 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
　
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