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 connected to the main supply ducts. The riser ducts supply the air to the
 cabin zones through cabin air outlets installed below and above the
 hatracks.
 Additional riser ducts are installed at the rear of the FWD passenger 
R  doors, and also forward of the AFT passenger doors.
 The cabin and door outlets are positioned to prevent draughts at
 seat-head level, and divide the air equally through the cabin zones.
 Most of the distribution ducts are made of resin and glassfiber laminate
 with metal sleeves bonded to each end for duct interconnection. Flexible
 bellows, which are made of silicone laminate and glassfiber, connect the
 ducts to each other. Clamps secure the flexible bellows. Insulation
 shells which are made of polyethylene foam or glass wool (covered with a
 Hypolon material) are installed around the ducts.
 B. Emergency Ram Air Inlet 
R  If there is a failure in both air conditioning packs, the emergency ram 
R  air inlet supplies the fresh air for the mixer unit. The air from the 
R  emergency ram air inlet is sufficient to supply the cockpit and cabin
 zones.
 C. LP Ground Connector 
R  When the aircraft is on ground, the air distribution and recirculation 
R  system can be supplied with air from the low pressure ground connector. A
 ground air cart can supply air into the system when the engines or the
 APU do not operate. 
R  You must not use conditioned air from the packs and the LP ground Unit at 
R  the same time.
 D. Cockpit Distribution
 (Ref. Fig. 003)
 Air from the mixing unit is supplied to the cockpit through a duct
 installed below the left-hand side of the cabin floor. Conditioned air is
 supplied to the cockpit at the these places:
 - the left-hand side of the Captain's station,
 - the left-hand side of the Captain's feet area;
 - the right-hand side of the First Officers station,
 - the right-hand side of the First Officers feet area,
 - at two positions in the left-hand ceiling area above the third crew
 member's station.
 At these positions the airflow is adjustable in quantity and direction:

 

 Air Distribution - Cockpit Figure 003
 1EFF : 1 1R 1CES  ALL  1 11 1 21-21-00 Page 8 Feb 01/00

 

 -
the left-hand and right-hand ceiling areas above the lateral windows,

 -
the left-hand and right-hand sides below the lateral windows. At these positions, the airflow is adjustable in quantity only:

 -at the left-hand and right-hand ceiling areas above the windshield.

R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
 E. Mixing Unit (Ref. Fig. 004) The mixing unit is installed under the cabin floor in front of frame 36. It mixes conditioned fresh air and recirculated cabin air before distribution to the system. The unit is made of two parts, the mixing chamber and the distribution head. The mixing chamber is made of resin and glassfiber laminate with a metal flange bonded to the top. Connected to this flange is an aluminum distribution head which distributes mixed-air to the system supply ducts and which contains the hot air supplies for both cabin zones. Crossfeed ducts are installed between the distribution head and the main supply ducts. These are made of aluminum and contain noise-attenuators. The main supply duct to the cockpit is made of aluminum at its interface with the hot trim-air system. An electrically operated back-up flap is installed in this duct. This flap makes sure that sufficient fresh air is delivered to the cockpit in case of a pack 1 failure (Ref. 21-51-00). The electrically operated back-up flap also operates in the case of the 24 DEG.C (75.20 DEG.F) back-up mode (when the cockpit is supplied by pack 1 only). Noise-attenuators are installed downstream of the hot trim-air interface. The mixing unit and crossfeed ducts are insulated with glasswool and a jacket made of a Hypolon material.

R **ON A/C 401-499,
 E. Mixing Unit (Ref. Fig. 004) The mixing unit is installed under the cabin floor in front of frame 36. It mixes conditioned fresh air and recirculated cabin air before distribution to the system. The unit is made of two parts, the mixing chamber and the distribution head. The mixing chamber is made of resin and glassfiber laminate with a metal flange bonded to the top. Connected to this flange is an aluminum distribution head which distributes mixed-air to the system supply ducts and which contains the hot air supplies for both cabin zones.

 Air Distribution - Mixer Unit Figure 004
　
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