Abstract: A suspension arrangement for suspending an air conditioning system from an aircraft airframe structure includes a first suspension unit including plural individual suspension rods, and a second suspension unit including a base frame supported from vertical carrier members. Upper ends of the carrier members are secured to load-carrying suspension points of the airframe structure. Upper ends of the suspension rods are secured to load-introduction points on the base frame. Bottom ends of the suspension rods are secured to suspension points on the components of the air conditioning system. The frame provides a greater number and variety of suspension locations to accommodate a greater number of suspension rods for suspending the air conditioning system, with a smaller number of vertical carrier members being secured to corresponding suspension points on the airframe structure. An intermediate mounting support arrangement may further be provided between the suspension rods and the suspension frame.

Abstract: A cooling air arrangement for an aircraft air conditioning unit includes an air inlet, a heat exchanger, an outlet plenum, first and second air outlet channels branching from the plenum, and a fan arranged in the first outlet channel. During flight of the aircraft, external ram air driven into the air inlet flows primarily through the second outlet channel. During ground operation, the fan primarily sucks cooling air through the first outlet channel, which merges back into the second outlet channel at an air mixing junction that functions as an injector nozzle and a non-return flap valve. The first outlet channel is provided in a spiral housing of the fan, or in a smooth curved duct. The air inlet and outlet of the cooling air arrangement, and the air outlet of the air cycle machine, are oriented in the same direction, e.g. the flight forward direction.

Abstract: An air conditioning system for an aircraft includes a first rotatable shaft with a first compressor, a first turbine, a cooling air fan, and an auxiliary compressor connected for rotation therewith, and preferably further includes a second rotatable shaft with a second compressor and a second turbine connected for rotation therewith. A compression, cooling, and expansion cycle driven by at least the first compressor and the first turbine provides a principle flow of air conditioning air. The auxiliary compressor draws in outside air and provides a redundant auxiliary ventilation air flow, which is supplied into the installation space in which the air conditioning unit is installed, or another space in the aircraft that requires a reliable constant ventilation and cooling whenever the air conditioning unit is operational. The auxiliary ventilation air may be connected to a common air distribution network with other air conditioning units.

Abstract: A suspension arrangement for suspending an air conditioning system from an aircraft airframe structure includes a first suspension unit including plural individual suspension rods, and a second suspension unit including a base frame supported from vertical carrier members. Upper ends of the carrier members are secured to load-carrying suspension points of the airframe structure. Upper ends of the suspension rods are secured to load-introduction points on the base frame. Bottom ends of the suspension rods are secured to suspension points on the components of the air conditioning system. The frame provides a greater number and variety of suspension locations to accommodate a greater number of suspension rods for suspending the air conditioning system, with a smaller number of vertical carrier members being secured to corresponding suspension points on the airframe structure. An intermediate mounting support arrangement may further be provided between the suspension rods and the suspension frame.

Abstract: A cooling air arrangement for an aircraft air conditioning unit includes an air inlet, a heat exchanger, an outlet plenum, first and second air outlet channels branching from the plenum, and a fan arranged in the first outlet channel. During flight of the aircraft, external ram air driven into the air inlet flows primarily through the second outlet channel. During ground operation, the fan primarily sucks cooling air through the first outlet channel, which merges back into the second outlet channel at an air mixing junction that functions as an injector nozzle and a non-return flap valve. The first outlet channel is provided in a spiral housing of the fan, or in a smooth curved duct. The air inlet and outlet of the cooling air arrangement, and the air outlet of the air cycle machine, are oriented in the same direction, e.g. the flight forward direction.

Abstract: An air conditioning system for an aircraft includes a first rotatable shaft with a first compressor, a first turbine, a cooling air fan, and an auxiliary compressor connected for rotation therewith, and preferably further includes a second rotatable shaft with a second compressor and a second turbine connected for rotation therewith. A compression, cooling, and expansion cycle driven by at least the first compressor and the first turbine provides a principle flow of air conditioning air. The auxiliary compressor draws in outside air and provides a redundant auxiliary ventilation air flow, which is supplied into the installation space in which the air conditioning unit is installed, or another space in the aircraft that requires a reliable constant ventilation and cooling whenever the air conditioning unit is operational. The auxiliary ventilation air may be connected to a common air distribution network with other air conditioning units.