Flight control and actuation systems

Liebherr develops, supplies and supports flight control and actuation systems and takes care of the product management over the complete life cycle.

The A380 power control unit is an integral part of the high lift system that Liebherr-Aerospace supplies for this large aircraft

The A380 power control unit is an integral part of the high lift system that Liebherr-Aerospace supplies for this large aircraft

Liebherr offers primary and secondary flight control systems, other actuation systems and hydraulic systems. The core parts of these systems - i.e. mechanical, hydraulic parts and electronics hardware with embedded software - are developed and manufactured in-house.

As a system supplier, Liebherr is capable to design and qualify complete flight control and actuation systems, from side stick in the cockpit to the movable surface actuators on the wings. The scope covers primary and secondary flight control systems that can be hydraulically or electrically driven. Latest fly-by-wire systems are part of the product program in this area.

Flap ballscrew actuator for the fly-by-wire flight control system of the Russian SuperJet 100

Flap ballscrew actuator for the fly-by-wire flight control system of the Russian SuperJet 100

High lift control systems are required to limit take-off and landing speeds by increasing wing high lift. This is achieved by wing leading and trailing edges extension devices.

High lift control systems can be driven hydraulically, electrically or with hybrid technology. For electrically driven systems that require high power electronic drives, Liebherr develops and produces special motor control units.

Flap and slat actuation

Liebherr develops and produces flap and slat actuation systems to extend the movable trailing edges and leading edge surfaces. These systems consist of a set of components that are installed along the wing trailing edge such as power control unit, geared rotary actuators, ball screw actuators, transmission shafts or position sensors. Liebherr’s capability does not only include the development and production of these components but also the system controller including hardware and software.

Liebherr-Aerospace supplies the four-axis actuator for the military helicopter Tiger.

Liebherr-Aerospace supplies the four-axis actuator for the military helicopter Tiger.

The primary flight control system is part of the complete function needed to pilot an aircraft. It is actuating three sets of movable surfaces of the airframe - aileron, rudder and elevator. Liebherr supplies such control systems including actuators and electronic controllers.

Fly-by-wire

Fly-by-wire technology is part of the systems that Liebherr offers for new applications. Actuators can be hydraulically or electrically driven depending on the aircraft architecture. Latest technology electro hydraulic actuators (EHA), electric back-up hydraulic actuators (EBHA), or electro-mechanical actuators (EMA) have been successfully integrated into the Liebherr product portfolio.

Tail rotor actuator, part of the fly-by-wire flight control system developed for the NH90 helicopter.

Tail rotor actuator, part of the fly-by-wire flight control system developed for the NH90 helicopter.

Main rotor and tail rotor actuation

Helicopters are controlled in their flight by acting on the rotor blades whether from the main rotor or from their tail rotor. This is achieved with dedicated actuators mostly hydraulically driven.

Liebherr develops and produces actuators for main and tail rotor as well as complete systems including actuators and actuator controllers.

Having developed one of the first fly-by-wire flight control systems for helicopters, Liebherr also has extensive experience in this area.

A380 fly-by-wire electrohydraulic servoactuator

A380 fly-by-wire electrohydraulic servoactuator

A380 fly-by-wire electrohydraulic servoactuator
The A380 fly-by-wire electrohydraulic servoactuator by Liebherr-Aerospace is powered from a centralized hydraulic system. It is used to actuate spoiler surface position 4 of the Airbus A380 aircraft.

During certain aircraft flight phases, particularly during landing, it is necessary to quickly and strongly reduce the wing lift. This is achieved by rising dedicated wing control surfaces against the air flow going along the wing profile.

This is achieved with dedicated spoiler actuators that are currently most of the time hydraulically powered.

The rear horizontal stabilizer of an aircraft is used to stabilize the airframe during the flight. To adjust this stabilizer at an appropriate position, an actuator is used that drives it to required setting. On most recent aircraft, this actuator, mostly of ball screw type, is hydraulically or electrically driven.

Boeing 777X

Boeing 777X

Liebherr supplies a wide variety of utility actuation systems for multiple applications. Our product portfolio ranges from door actuators, latch and locking systems up to complex actuation systems for wing tip folding or air refueling.

We develop and manufacture actuators to open and close doors for applications like cargo doors, weapon bay doors or landing gear doors. Liebherr also is able to supply complete customized door actuation systems featuring actuators, control manifolds and system electronic controllers with embedded software.

Latch and Locking systems include landing gear up-locks and ramp door latch actuators for military transport aircraft.

The world’s first commercial aircraft featuring folding wingtips, the Boeing B777X, is equipped with a hydraulically driven folding mechanism made by Liebherr, including a power drive unit, geared rotary actuators and latch/locking actuators.

The most advanced air refueling systems, used on A330 MRTT, A400M, KC-46 or KC-390 are equipped with Liebherr Hose Drum Drive Systems. The Liebherr Ruddervator Control Systems supports the operation of the A330 MRTT boom refueling system.

Commercial aircraft engines are equipped with a thrust reverser helping to decelerate the aircraft after touch down by reversing the direction of the exhaust stream. This helps to reduce the stress on the landing gear brakes and constitutes a major safety feature for landing in bad weather conditions, when the aircraft brakes might no longer be effective enough to bring the aircraft to a stop.

Liebherr-Aerospace provides the Thrust Reverser Actuation System (TRAS) to move the thrust reverser doors when activated by the pilot. A typical hydraulically actuated TRAS comprises door actuators, locking/unlocking actuators, hydraulic valve blocks, check valves, position sensors and hydraulic control units.

Thrust Reverser Actuation Systems are considered as being safety critical. The system needs to be designed in a way that a deployment of the system during flight is impossible.

Liebherr-Aerospace is also capable to develop Electrical Thrust Reverser Actuation Systems, using electro-mechanical actuators instead of hydraulic actuators.

Filter package for the Eurofighter program

Filter package for the Eurofighter program

Filter package for the Eurofighter program
Filter package by Liebherr-Aerospace for the Eurofighter program. Each filter package filters the high pressure flow to the consumers on board the aircraft and the low pressure flow to the pump at flow rates up to 240 l/min.

Liebherr develops and manufactures hydraulic pumps and motors ranging from 1,500 psi over 3,000 psi up to 5,000 psi. These piston pumps and motors are used in high reliability applications like electro-hydraulic actuators or high lift systems on commercial airplanes and military transport aircraft.

Electrically driven pumps are also part of the Liebherr product portfolio. They are used on board different aircraft like fighters and helicopters.

System control

Aircraft and helicopters use hydraulic circuits to power different systems like flight control actuation, landing gear extension and retraction or landing gear door actuation. These utility functions require system control in order to fulfil the various tasks in the right sequence, for example to open doors, deploy mechanism and lock the doors in the open position.

This is achieved with customized manifolds featuring complex hydraulic circuits and carrying various components like sensors or valves. Selected materials are aluminum, steel and titanium.

Liebherr is a specialist in designing, developing and manufacturing of such system control components.

Liebherr-Aerospace's test rig for the A380 gear rotary actuator

Liebherr-Aerospace's test rig for the A380 gear rotary actuator

Liebherr has complete flight control actuation system testing capabilities.

In a dedicated test center in Lindenberg, Germany, the various subsystems can be installed and tested together. Liebherr designs and manufactures the test rigs for complete primary and secondary flight control systems integration including the test rig control load and failure simulation.

Downloads

Video: Test and Qualification Center

From specification to certification: In the test and qualification center at Liebherr-Aerospace Lindenberg GmbH, we offer this overall service and accompany our customers throughout the whole process.
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From specification to certification: In the test and qualification center at Liebherr-Aerospace Lindenberg GmbH, we offer this overall service and accompany our customers throughout the whole process. Play video
From specification to certification: In the test and qualification center at Liebherr-Aerospace Lindenberg GmbH, we offer this overall service and accompany our customers throughout the whole process.
We need your consent This YouTube video is provided by Google. If you load the video, your data - including your IP address - is transmitted to Google and may be stored and processed by Google inter alia in the USA. We have no influence over further data processing by Google. By clicking on "Accept", you consent to the transmission of data to Google for this video in accordance with Art. 6 (1) (a) GDPR and at the same time expressly consent to the transfer of data to the USA in accordance with Art. 49 (1) (a) GDPR. If you no longer wish to consent to each YouTube video individually in the future and wish to be able to load the videos without this blocker, you can also select "Always accept YouTube" and thereby consent to the associated data transmissions and transfers to Google and to the USA for all other YouTube videos which you open on our website in the future. Please note that, in the opinion of the European Court of Justice, there does not currently exist an adequate level of data protection in line with EU standards in the USA, and at present we cannot provide suitable safeguards to protect your data and offset this shortcoming. Possible risks to you of data transfer to the USA are that access by state authorities cannot be excluded and that your data could be processed for reasons of national security, criminal prosecution or for other purposes in the public interest of the USA, possibly without you being informed separately and without enforceable rights and effective means of redress being available to you. You can withdraw consent that you have given at any time with future effect via the settings. For further information, please see our Data Protection Declaration and Google's Privacy Policy.

Case studies

Learn about aircraft programs that feature Liebherr flight control systems.

Contacts

Liebherr-Aerospace Lindenberg GmbH

Pfänderstraße 50-52

88161 Lindenberg/Allgäu

Germany

  • Phone+49 8381 46-0
  • Fax+49 8381 46-4377

Special Processes: Surface and heat treatment

Whether for training, career start or further development in your professional life – come to us and be part of the Liebherr family. Play video
Whether for training, career start or further development in your professional life – come to us and be part of the Liebherr family.
We need your consent This YouTube video is provided by Google. If you load the video, your data - including your IP address - is transmitted to Google and may be stored and processed by Google inter alia in the USA. We have no influence over further data processing by Google. By clicking on "Accept", you consent to the transmission of data to Google for this video in accordance with Art. 6 (1) (a) GDPR and at the same time expressly consent to the transfer of data to the USA in accordance with Art. 49 (1) (a) GDPR. If you no longer wish to consent to each YouTube video individually in the future and wish to be able to load the videos without this blocker, you can also select "Always accept YouTube" and thereby consent to the associated data transmissions and transfers to Google and to the USA for all other YouTube videos which you open on our website in the future. Please note that, in the opinion of the European Court of Justice, there does not currently exist an adequate level of data protection in line with EU standards in the USA, and at present we cannot provide suitable safeguards to protect your data and offset this shortcoming. Possible risks to you of data transfer to the USA are that access by state authorities cannot be excluded and that your data could be processed for reasons of national security, criminal prosecution or for other purposes in the public interest of the USA, possibly without you being informed separately and without enforceable rights and effective means of redress being available to you. You can withdraw consent that you have given at any time with future effect via the settings. For further information, please see our Data Protection Declaration and Google's Privacy Policy.

All on board: Liebherr-Aerospace systems

Learn more about the systems and componentsLiebherr-Aerospace develops, manufactures and services in this animated clip. Play video
Learn more about the systems and components Liebherr-Aerospace develops, manufactures and services in this animated clip.
We need your consent This YouTube video is provided by Google. If you load the video, your data - including your IP address - is transmitted to Google and may be stored and processed by Google inter alia in the USA. We have no influence over further data processing by Google. By clicking on "Accept", you consent to the transmission of data to Google for this video in accordance with Art. 6 (1) (a) GDPR and at the same time expressly consent to the transfer of data to the USA in accordance with Art. 49 (1) (a) GDPR. If you no longer wish to consent to each YouTube video individually in the future and wish to be able to load the videos without this blocker, you can also select "Always accept YouTube" and thereby consent to the associated data transmissions and transfers to Google and to the USA for all other YouTube videos which you open on our website in the future. Please note that, in the opinion of the European Court of Justice, there does not currently exist an adequate level of data protection in line with EU standards in the USA, and at present we cannot provide suitable safeguards to protect your data and offset this shortcoming. Possible risks to you of data transfer to the USA are that access by state authorities cannot be excluded and that your data could be processed for reasons of national security, criminal prosecution or for other purposes in the public interest of the USA, possibly without you being informed separately and without enforceable rights and effective means of redress being available to you. You can withdraw consent that you have given at any time with future effect via the settings. For further information, please see our Data Protection Declaration and Google's Privacy Policy.