Air Distribution - Cockpit Figure 003
1EFF : 1 1R 1CES ALL 1 11 1 21-21-00 Page 8 Feb 01/00
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the left-hand and right-hand ceiling areas above the lateral windows,
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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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