1st aviation web TV
Video reports on aviation news
 Choose your language

> > > How it Works? > Why do landing gears have the same lowering and retraction system?

Video - Why do landing gears have the same lowering and retraction system?

- By

It’s not necessarily obvious, yet all commercial aircraft today are equipped with the same system. After takeoff, their front landing-gear retracts in a forward direction, from the rear, towards the front of the plane, and when landing, lowered in the reverse direction. But why? To find out, we went to see a specialist who works for the supplier OEM Safran Landing Systems (former Messier-Bugatti-Dowty) near Paris. His explanation is simple, it's actually for security issues when the landing gear is being lowered in case of a hydraulic system failure.

Pierre Woerner, Expert Landing Gears - Safran Landing Systems: interview in the video.

The landing gear control circuit is in fact linked to the hydraulic circuit of the aircraft. In the event of hydraulic failure, this system allows landing gear to lower itself, ‘‘manually’’ so to speak. If some ‘planes from the 40’s era, such as the Lockheed Constellation, are perfect examples which operated in the opposite fashion, with its forward landing gear lowering from the rear to the front, it was because they were equipped with not one, but two hydraulic circuits.

As for the main landing gear, they are retracted and lowered laterally since their weight gives them a big advantage compared to that of the nose landing gear.

Pierre Woerner, Expert Landing Gears - Safran Landing Systems: interview in the video.

Regarding the retraction and lowering system of the nose landing gear, it is now imposed by the EU and US civil aviation authorities. No wonder, therefore, that all airliners are equipped with the same type of system.

Your comments
    Be the first one to post a comment
    Leave a comment

    Input limited to 1000 characters

    Enter the characters represented on the image below.
    This field is not case sensitive.


    * Required fields

      Publicité :Safran-2017
      Spot’Air weekly photo Airbus A330 Neo - first flight

      Your latest comments

      New Events