First quess would be tires. I'd lift the plane &  spin them by hand with
something like a pencil for a dial indicater(or a real one)  running
against the tread You'll be able to tell. If there ok you could use
something like a buffer with a wore out pad to spin them up pretty fast to
see if they shake much. (You could see if your new roters are straight as
well.) That would give you a pretty good idea if there out of balance or
not. If they look like they might be out of balance don't know what to tell
you. Must be somebody that balances tires that small.. If  there out of
round at all change them. Maybe you'll get lucky with the balance as
well..You may have a combo. of both. Cheap fix if that does it. If it was
an alignment issue you could read it on the tires. They'd be worn unevenly
(.Disclaimer; I'm no expert on airplanes but I have been repairing wrecked
cars as a profession for 30+ yrs.) Does that make me a professor? Good luck


> [Original Message]
> From: Tom McNerney <dudewanarace@yahoo.com>
> To: <lml@lancaironline.net>
> Date: 7/31/2008 12:27:10 PM
> Subject: [LML] LNC2 Vibration
>
> Before I go and over engineer a problem, I thought I would get every ones
expert advice first.? It clearly has worked well for me in the past.
(Thanks Grayhawk)?
?
I have what feels to be a classic case of warped rotors, but that isn't
it.? About the last half of the roll out I start to get a vibration from
the right main gear.? Or at least I think it is the right side.? Thinking
it was an easy fix I replaced the rotors with a new set.? I think it is
better, but that could be just in my head.? The vibration is much worse
under braking, but does exist while just rolling.? As most vibrations, it
seems to have a peak intensity at a certain speed. 30-50 mph I would
guess.? This has the original rubber cushion landing gear.
?
So, here are my ideas..
?
Bad tire that is out of balance?? Waaay out of balance. They are Chang Shin
tires, so maybe I got what I paid for.? haha
?
Out of Alignment? This aircraft has had the service bulletin
completed?regarding the main gear reinforcement.? Could?this have caused an
alignment issue??
?
Nature of the beast?? It has had this problem from the day I purchased it,
so maybe it is just me. Although I hope not!
?
Would love to hear some ideas or past experience with this.
?
Thank a ton!
Tom McNerney
N54SG
>
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