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Whats up with this MD-11 gear?

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  • Whats up with this MD-11 gear?

    [photoid=6531324]

    According to the caption, and judging by the extension of flaps, the airplane is landing...looks like the main doors are still down and the gear is hanging funny...
    Last edited by AJ; 2009-04-14, 03:28.

  • #2
    Originally posted by Leftseat86 View Post
    http://jetphotos.net/viewphoto.php?id=6531324&nseq=36

    According to the caption, and judging by the extension of flaps, the airplane is landing...looks like the main doors are still down and the gear is hanging funny...
    Are you talking about the fact that the main Gear bogies are not level with the bottom of the aircraft? If you are there is a hinge point where the bogie connects to the strut - this enables the 4 main wheels to load share rather than if the bogie was rigidly connected to the strut at 90 degrees. The 'droop' at the front would be caused by aerodynamic loads or the centre of balance of the bogie.

    If aorcraft did not have this feature and the bogie was rigidly connected to the strut at 90 degrees, in a multi wheel bogie setup as the plane came in to land land most if mot all of the forces would basically be on the rear two tyres only, whith the front two only assisting after the nosewheel touched down.

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    • #3
      Originally posted by SYDCBRWOD View Post
      Are you talking about the fact that the main Gear bogies are not level with the bottom of the aircraft? If you are there is a hinge point where the bogie connects to the strut - this enables the 4 main wheels to load share rather than if the bogie was rigidly connected to the strut at 90 degrees. The 'droop' at the front would be caused by aerodynamic loads or the centre of balance of the bogie.

      If aorcraft did not have this feature and the bogie was rigidly connected to the strut at 90 degrees, in a multi wheel bogie setup as the plane came in to land land most if mot all of the forces would basically be on the rear two tyres only, whith the front two only assisting after the nosewheel touched down.
      I know this to be the case for most aircraft, but the bogie hangs in a particular fashion that is pretty regular on most aircraft, and on the md-11 it is usually not tilted so far, as you can see:

      http://www.jetphotos.net/showphotos....2|||1|||||||||

      Also, the main gear doors are still open which is not normal unless the gear was just extended, though it would appear to be far too low of an altitude for that to be the case.

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      • #4
        The bogies are fine, but the doors should be closed.

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        • #5
          The bogies are not fine.

          The aircraft has done an alternate extension of the landing gear after a hydraulic system failure.

          That system must also drive the bogie position as it should appear like this:
          [photoid=6308651]

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          • #6
            Another similar instance:

            [photoid=6530489]

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            • #7
              Originally posted by Leftseat86 View Post
              Another similar instance:

              [photoid=6530489]
              If you are showing that some aircraft have the boggies tilted for the gear to correctly fit into the wheel well, fine but the MD-11's boggies are close to level when the hydraulic systems are pressurized. The 767's boggies are positioned with a tilt forward, one of the few that do. The 747 has an extreme aft tilt. The A340 pictured in your post is normal. The MD-11 shown in post 1 is operating with a failed #3 hydraulic system.
              Don
              Standard practice for managers around the world:
              Ready - Fire - Aim! DAMN! Missed again!

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              • #8
                Originally posted by Dmmoore View Post
                The A340 pictured in your post is normal.
                Except that the main gear doors are partially open.

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                • #9
                  Like AJ said, this is caused by using alternate gear down. The landing gear will fall due to it's own weight and it will push the doors open.
                  Probably a failure of one of the three hydr systems.

                  The bogies are hanging backwards because you don't have hydr power for the tilt actuators. Same go's for the doors, they stay open due to no hydraulics.
                  “The only time you have too much fuel is when you’re on fire.”

                  Erwin

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