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Center Gear Not Touching Ground.  
User currently offlineAdam84 From United States of America, joined Jul 1999, 1400 posts, RR: 2
Posted (15 years 6 months 3 days 20 hours ago) and read 1729 times:

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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3 replies: All unread, jump to last
User currently offlineGKirk From UK - Scotland, joined Jun 2000, 25347 posts, RR: 54
Reply 1, posted (15 years 6 months 3 days 19 hours ago) and read 1703 times:

OBVIOUSLY!!!! The a/c is in the middle of landing and the main gear has just touched down.

When you hear the noise of the Tartan Army Boys, we'll be coming down the road!
User currently offlineThom@s From Norway, joined Oct 2000, 11963 posts, RR: 41
Reply 2, posted (15 years 6 months 3 days 19 hours ago) and read 1688 times:

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.


"If guns don't kill people, people kill people - does that mean toasters don't toast toast, toast toast toast?"
User currently offlineFDXmech From United States of America, joined Mar 2000, 3251 posts, RR: 30
Reply 3, posted (15 years 6 months 3 days 18 hours ago) and read 1683 times:

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.

You're only as good as your last departure.
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