Liebherr on board the Boeing 777X
The 777X is Boeing's newest family of twin-aisle airplanes that builds on the market-leading 777. Liebherr will supply the folding wing tip system, the power drive unit and the hydraulic motor, as well as the high lift actuators.
Boeing Commercial Airplanes launched the airplane in November 2013 at the Dubai Airshow with 259 commitments from four customers. Production of the 777X is scheduled to begin in 2017 and first delivery is targeted for 2020.
The 777X will have two variants, the 777-8X and the 777-9X. The 777X will feature new engines, new composite wings, and technologies from the Boeing 787.
The 777X introduces the latest innovative technologies, including the most advanced, fuel-efficient commercial engine ever. In addition, the fourth-generation 777X composite wing has a longer span than today’s 777. Its folding, raked wingtip and optimized span deliver greater efficiency, significant fuel savings and complete airport gate compatibility.Learn more about Liebherr flight control systems
Folding wing tip system
Relying on its experience in high-lift systems, gears, torque tubes and hydraulic power drive units, Liebherr-Aerospace will design a compact, extremely reliable and powerful fold subsystem which fits into a very narrow section of the 777X’s wing. With its motor and rotating actuator, this system will fold the wing tip after landing, thus reducing the wingspan of the new wide-body aircraft by 7 meters (3.5 meters on each side) from 71.8 meters to 64.8 meters.
When it comes to the development of the actuators, Liebherr-Aerospace can rely on its know-how in hydraulic actuation for primary flight controls.
First folding wing tip system in commercial aviation
The extremely large wingspan is one of the factors defining the Boeing 777X, and this would normally exclude the aircraft from using the same airport gates as the current Boeing 777 model. However, thanks to its special wing tips which can be folded up after landing, the 777X will still be in the same wingspan category as the 777. For take-off, the wing tips will be unfolded back into the horizontal position, providing the benefit of an extended span to increase fuel efficiency. The folding wing tip system is the first of its kind in commercial aviation.
Hydraulic motor and power drive unit
Relying on its unrivalled experience in high-lift systems for long-range commercial aircraft, and especially in gears and hydraulic motors, Liebherr-Aerospace will design compact, extremely reliable and lightweight components. The hydraulic motor and the power drive unit will deliver the mechanical power needed for the aircraft’s leading edge actuators.
High lift actuators
Relying on its unrivalled experience in high-lift systems and especially in geared rotary actuators for long-range commercial aircraft, Liebherr-Aerospace not only designs, manufactures and services the leading edge actuators, but the company also produces the trailing edge actuators. The design and development of the Boeing 777X trailing edge geared rotary actuators, which are among the largest one’s ever designed and built for commercial aviation, reside with Boeing. Liebherr-Aerospace on its part supports the design and development both from its Seattle office and its Lindenberg facilities.
In addition, Boeing has selected Liebherr-Aerospace to provide the 777X iron wing test rigs and the mini rigs for secondary flight controls. These test rigs are built at Liebherr-Aerospace’s test center for flight controls in Lindenberg (Germany). The iron wings are installed there, whereas the mini rigs are delivered to Boeing’s site in Everett, Washington (USA).
Liebherr-Aerospace performs all its design, development, testing and manufacturing activities in Lindenberg, which is home to Liebherr-Aerospace Lindenberg GmbH, Liebherr’s worldwide center of excellence for flight control systems and landing gears.