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Post by stroudj on Oct 22, 2018 20:02:10 GMT
Aircraft: 2014 Tecnam P2008. 600 Hobb hours. Modifications: Install Beringers Brakes June 2017, Beringers brakes has 521 landing in 281 hrs. Problem: A vibration that varied from light to heavy on rotation and touchdown. Inspections: All undercarriage hardware was inspected and retorqued. No problems noted. Installed a camera on rear tie down. Videoed the landing gear doing touch and goes. Noticed unusual movements from the left main gear. Removed the tire and found a 15G rubber weight loose inside the tire. Repair: Reattached the weight to the tire. It lasted 3 touch & goes before it came off again. Purchased a new tire, problem solved. To me this was an unusual problem. I was surprised that this little weight could cause such a massive vibration problem. Thanks, Jim  : |
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Post by Cluemeister on Oct 22, 2018 20:15:04 GMT
I went to Beringers when my tube tires were bunching up inside the tire, and causing vibrations on landing. Are your tires tubeless?
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Post by stroudj on Oct 22, 2018 20:22:29 GMT
I went to Beringers when my tube tires were bunching up inside the tire, and causing vibrations on landing. Are your tires tubeless? Yes, they are tubeless, the tires are Michelin Aviators that was supplied with the Beringers wheels and brakes. |
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Post by Flocker on Oct 23, 2018 12:37:37 GMT
Removed the tire and found a 15G rubber weight loose inside the tire. How are the weights attached to the wheel? |
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Post by stroudj on Oct 23, 2018 13:17:14 GMT
Removed the tire and found a 15G rubber weight loose inside the tire. How are the weights attached to the wheel? It was glued on like a tube less tire patch. |
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Post by Tony on Oct 23, 2018 13:42:19 GMT
 That must have made one heck of a racket?
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Post by Flocker on Oct 23, 2018 15:33:55 GMT
I assume it was attached to the aluminum wheel and not the actual tire - correct?
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Post by Glenn on Oct 23, 2018 16:05:32 GMT
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Post by Flocker on Oct 23, 2018 18:01:15 GMT
Interesting. Thanks.
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bones
New Member
Posts: 2 
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Post by bones on Nov 13, 2018 17:13:06 GMT
Glen. I am new, so I'm not sure how to post. I'm concerned about a vibration that increases with taxi speed. (I think it's the front tire. P2008, 2012) and tried to search it with no success. Can you help me? I remember seeing some posts on this issue but darn if I can retrieve the discussions. Excuse my unfamiliarity. Bill |
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Post by Glenn on Nov 13, 2018 18:01:37 GMT
Hi Bones,
You said it happens at taxi speed. Is that while braking or just taxing at a slow walk speed?
Try to identify where the vibration or shimmy is coming from. I'd remove all wheel pants. Lift the nose and give the nose wheel and gear a good going over to see if anything is loose. Rotate the nose tire and see if it wobbles. Jack up one main wheel enough to clear the ramp and check the gear leg, tire, brake assembly and wheel for looseness. Rotate the tire and see if it wobbles. That should give you a good idea how and where to proceed next.
Glenn
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Post by Glenn on Nov 13, 2018 20:34:16 GMT
Bones,
I forgot to suggest you verify the nose strut pressure. I think the MM says 290 PSI but most of us consider that's a minimum.
Some reports suggest nose wheel shimmy goes away with about 310-320 PSI.
Also verify the torque of the nose gear friction nut to 50 lbs ft.
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: 
That must have made one heck of a racket?
