Adam84
Topic Author
Posts: 1368
Joined: Sat Jul 24, 1999 6:10 pm

Center Gear Not Touching Ground.

Wed Nov 29, 2000 12:44 am

Why is the center gear on this DC-10 not touching the ground even though the main gear is on the ground? Does the center gear only contact the ground when the plane is level or what? Thanks in advance

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gkirk
Posts: 23348
Joined: Thu Jun 15, 2000 3:29 am

RE: Center Gear Not Touching Ground.

Wed Nov 29, 2000 1:12 am

OBVIOUSLY!!!! The a/c is in the middle of landing and the main gear has just touched down.
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Thom@s
Posts: 11674
Joined: Thu Oct 19, 2000 2:03 am

RE: Center Gear Not Touching Ground.

Wed Nov 29, 2000 1:28 am

I'll have to agree with GKirk on that one. The plane is still "resting" on it's wings and hasn't put to much weight on the wheels yet.

Thom@s
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FDXmech
Posts: 3219
Joined: Sun Mar 19, 2000 9:48 pm

RE: Center Gear Not Touching Ground.

Wed Nov 29, 2000 2:00 am

This DC10 although the main gears are on the ground, the main gears are still at full oleo extend meaning that the struts haven't yet compressed. If you notice, the auto ground spoilers have not yet deployed. Also the center gear on the DC10-30 is canted so the wheels are angled forward of the trunnion (the trunnion is where the gear mounts to the fuselage and is the pivot point during retraction/extension)which in effect creates an angle that causes the center gear to contact the ground after the mains compress. In other words if you observed a DC10-30 parked at the gate, the center gear is not vertical but tilted with the tires closer to the nose than the top of the gear. When the aircraft settles (ground spoilers extend and struts compress) the center gear will contact the runway even if the nose gear is still in the air. While I'm boring you with this I might as well stick in one more thing totally unrelated to the question asked. On the DC10-30/MD11 but not the DC10-10 (no center gear) because of the built in angle of the center gear, loading of the a/c must be accomplished with the parking brake released to allow the center gear to move with the changing weight of the aircraft. Otherwise over time damage due to stress will occur.
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