R **ON A/C 151-199, 401-499,
 Subtask 21-20-00-410-052-A
 B. Close Access
 (1) Make sure that the work area is clean and clear of tool(s) and other items.
 (2) Install the aft lavatory (Ref. TASK 25-43-41-400-001).
 **ON A/C ALL

 Subtask 21-20-00-410-053
 C. Close Access
 (1)
 Make sure that the work area is clean and clear of tool(s) and other items.

 (2)
 Install the cabin ceiling panels between C16 and C65 (Ref. TASK 25-23-41-400-001).

 Subtask 21-20-00-941-052
 D. Remove the warning notice(s).

 AIR DISTRIBUTION AND RECIRCULATION - DESCRIPTION AND OPERATION
______________________________________________________________
 1. General
_______
 A. Cabin Air Distribution and Recirculation The cabin air distribution system supplies conditioned air to the cabin and to the cockpit. The Cockpit and cabin main supply ducts come from the mixer unit, which is the central element of the distribution system. The air flows out of the cabin through the lower sidewall-panels (dado panels) to the underfloor area. A part of the exhaust air of the cabin and the underfloor area is mixed with fresh air from the air conditioning packs in the mixer unit. This recirculated air is drawn by recirculation fans through recirculation 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.
 2. Component Location
__________________
 (Ref. Fig. 001)

 -------------------------------------------------------------------------------FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA
 | | | | DOOR | REF. -------------------------------------------------------------------------------15HG FAN-RECIRCULATION 131PW 137 825 21-21-51 14HG FAN-RECIRCULATION 132PW 138 825 21-21-51 4010HM FILTER HOUSING 131PW 137 825 21-21-45 4011HM FILTER HOUSING 132PW 138 825 21-21-45 4012HM FILTER-RECIRCULATION 131PW 137 825 21-21-41 4013HM FILTER-RECIRCULATION 132PW 138 825 21-21-41 4020HM CHECK VALVE 131PW 137 825 21-21-42 4021HM CHECK VALVE 132PW 138 825 21-21-42
 3. System Description
__________________
 A. Air Supply and Ducting for Passenger Cabin
R **ON A/C 001-049, 051-099, 101-149, 201-299, 301-399,
 (Ref. Fig. 002)

 Air Distribution and Recirculation - Component Location
 Figure 001 (SHEET 1)

 Air Distribution and Recirculation - Component Location
 Figure 001 (SHEET 2)

 Air Distribution - Passenger Cabin
 Figure 002

R 1EFF : 001-049, 051-099, 101-149, 201-299, 1 21-21-00Page 4 1301-399, 1May 01/05 1 1 1CES 1R **ON A/C 151-199, 401-499,

 (Ref. Fig. 002A)
 **ON A/C ALL
 The passenger cabin is divided into the FWD and AFT distribution zones which are supplied with temperature controlled and conditioned air. The conditioned air provided by the air conditioning packs 10HM (11HM) is supplied through a mixing unit installed under the cabin floor (in front of frame 36). Cabin air which has entered the underfloor area, is drawn through recirculation filters 4012HM (4013HM) by recirculation fans 14HG (15HG). The recirculation fans blow the air through check valves 4020HM (4021HM) to the mixing unit. The mixing unit mixes the conditioned air from the conditioning packs with the cabin recirculation air.
 **ON A/C 001-049, 051-099, 101-149, 201-299,
 The quantity of cabin recirculation air mixed with conditioned air changes between 34% - 36% (in normal operational cases). This is related to the position of the flow selector 5HB

R **ON A/C 151-199, 401-499,
 The quantity of cabin recirculation air mixed with conditioned air changes between 29% - 42% (in normal operational cases). This is related to the position of the flow selector 5HB
 **ON A/C 301-399,
 The quantity of cabin recirculation air mixed with conditioned air changes between 40% - 48% (in normal operational cases). This is related to the position of the flow selector 5HB

 Air Distribution - Passenger Cabin
 Figure 002A

R 1EFF : 151-199, 401-499, 1 21-21-00Page 6 1 1 Aug 01/05 1 1 1CES 1

 **ON A/C ALL 
R  From the mixing unit, the air is supplied to the cabin zones through 
R  ducts with different diameters. Large diameter supply ducts are installed
 under the cabin floor along the left-hand and right-hand side.
 Smaller diameter riser ducts with integrated sound absorbers are
　
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