The two circuits powered electrically drive nonconventional actuators known as electro-hydrostatic actuators (EHAs). This type of flight-control system - found on most commercial aircraft today - is referred to as a fly-by-wire system, because it is controlled electrically. The two hydraulically powered systems drive conventional servo-controlled actuators, and are the primary operating flight-control circuits. Any one of these four systems can operate the aircraft, bringing the redundancy in flight control to a point unequaled on any other plane - commercial or military. Four independent primary flight-control systems will reside on each A380: two powered hydraulically and two powered electrically.
In designing the A380, Airbus created a dual-architecture system for the flight controls. Now Airbus' new A380, a monster of a plane, is changing all that. Passenger aircraft have been relegated to 3000-psi hydraulic systems (with the exception of the Concorde, which features a 4000 psi system). Since the 1970s, military aircraft have been using 5000 psi hydraulic systems, which use lighter-weight components to actuate the flight control surfaces. Every extra pound contributes to fuel costs - and impacts the bottom line for the airlines. Click image to enlarge.įew other industries focus on weight as much as aircraft manufacturers, and with good reason. Ultimately, Eaton was selected to design and supply the hydraulic power-generation system and later the aircraft's fluid-distribution system. From this coordinated effort (based at Airbus' headquarters in Toulouse, France), the team undertook a four-month plateau phase, in which a component specifications criteria was developed. The result of the system design study supported the decision to go with a 5000-psi hydraulic system. They contacted several aerospace hydraulic suppliers and began a coordinated engineering evaluation of the latest hydraulic-system technologies and their advantages. When Airbus first decided to begin the engineering challenge to build the world's largest commercial aircraft, they knew that weight and component volume would be a critical factor in the overall design. This file type includes high resolution graphics and schematics when applicable.
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