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 Post subject: Columbia 400 nose shimmy
PostPosted: 15 Sep 2021, 16:55 
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Joined: 07/24/19
Posts: 18
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Company: CAV Ice Protection
Location: New Century, KS
Aircraft: Columbia 400
Have a Columbia 400 with a nose wheel shimmy. It is very light below 20kts and increases to moderate between 25 and 28kts. After 30kts it stops. Tire is balanced, bearings are good, strut is serviced and I'm out of ideas on what to do to stop this shimmy.

Any thoughts are much appreciated! Thanks!

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 Post subject: Re: Columbia 400 nose shimmy
PostPosted: 15 Sep 2021, 18:00 
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Joined: 12/03/17
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Location: Brevard, NC
Aircraft: Lancair LNC2 - SOLD
There's a lot of discussion on nose wheel shimmy over on Lancairtalk.net . When you did the strut service, what kind of strut oil did you use? https://lancairtalk.net/viewtopic.php?f ... mmy#p41897 (You have to join the forum to read).


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 Post subject: Re: Columbia 400 nose shimmy
PostPosted: 16 Sep 2021, 09:15 
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Company: CAV Ice Protection
Location: New Century, KS
Aircraft: Columbia 400
Username Protected wrote:
There's a lot of discussion on nose wheel shimmy over on Lancairtalk.net . When you did the strut service, what kind of strut oil did you use? https://lancairtalk.net/viewtopic.php?f ... mmy#p41897 (You have to join the forum to read).


Thanks for the link. Strut was just serviced during annual. MIL-H-5606F.

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 Post subject: Re: Columbia 400 nose shimmy
PostPosted: 16 Sep 2021, 09:21 
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What tire and pressure?


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 Post subject: Re: Columbia 400 nose shimmy
PostPosted: 16 Sep 2021, 13:11 
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Username Protected wrote:
Strut was just serviced during annual. MIL-H-5606F.
According to the information at the link, you don't want to use MIL-H-5606. They recommend motorcycle strut oil 20W or 30W. I use the 20W in my Lancair 235. Disclaimer: I don't know the proper oil for the Columbia and am just pointing you to what other Columbia owners have recommended. Don't sue me!


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 Post subject: Re: Columbia 400 nose shimmy
PostPosted: 16 Sep 2021, 14:16 
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Company: CAV Ice Protection
Location: New Century, KS
Aircraft: Columbia 400
Username Protected wrote:
What tire and pressure?


Goodyear Flight Special II 5.00-5 88PSI

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 Post subject: Re: Columbia 400 nose shimmy
PostPosted: 16 Sep 2021, 17:44 
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Location: Brevard, NC
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88 psi seems high to me, BWTFDIK? Is your nose tire tubeless? I run 45 PSI in the nose tire of my Lancair 235. You really need to join Lancairtalk.net. It's free. There are a lot of knowledgeable people over there and there's a topic on this very question.


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 Post subject: Re: Columbia 400 nose shimmy
PostPosted: 16 Sep 2021, 18:36 
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88 psi seems high to me, BWTFDIK? Is your nose tire tubeless? I run 45 PSI in the nose tire of my Lancair 235. You really need to join Lancairtalk.net. It's free. There are a lot of knowledgeable people over there and there's a topic on this very question.


It’s a certified airplane, 88psi is in the POH, as well as the fluid in his nose strut, he can’t change from the specs freely like an experimental

The last 400 I saw with a chronic shimmy issue had a damaged/bent attachment on the pivot point from a prior hard landing, matches your behavior perfectly


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 Post subject: Re: Columbia 400 nose shimmy
PostPosted: 16 Sep 2021, 19:26 
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...88psi is in the POH, as well as the fluid in his nose strut, he can’t change from the specs freely like an experimental...
How sad for you certified guys ;)


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 Post subject: Re: Columbia 400 nose shimmy
PostPosted: 16 Sep 2021, 19:43 
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...88psi is in the POH, as well as the fluid in his nose strut, he can’t change from the specs freely like an experimental...
How sad for you certified guys ;)


As someone who’s owned both, in this situation, it’s ideal that it’s certified, troubleshooting an experimental doing this is a lot more difficult as you’re down to trial and error, there’s no standard parts to swap; etc

Lots of experimental for sale with very few flight hours on them, caveat emptor- the ones with a good amount of hours on them have these sort of gremlins sorted out

The Col400 has a different nose gear setup than the Lancair ES, but the ES crowd has gone to an upgraded strut and a tube tire with lower pressures, and do not have shimmy complaints

I’m betting a hard landing has bent something

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 Post subject: Re: Columbia 400 nose shimmy
PostPosted: 16 Sep 2021, 21:12 
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If the tire has any significant scallops in it, it will shimmy regardless of balance. Because it is out of round. Also, some tires will static balance, but still shake in service. This happens to tires that have had internal ply separation due to hard landings. Running higher than specified air pressure will also contribute to shimmy.

I would install a new Goodyear Flight Custom III tire, with a Michelin Airstop inner tube, and balance that assembly.

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 Post subject: Re: Columbia 400 nose shimmy
PostPosted: 16 Sep 2021, 21:46 
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Location: Birmingham
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Although a different and much simpler/cruder system, our rv had some shimmy issues that were eventually determined to most likely be coming from the main strut attachment bolt being slightly out of torque. I’m candidly not sure that was really the cause but it didn’t happen after the visit where that was found.. Also look at the caster pivot bracket and all of your other angles. Assuming the tire is good and the strut is properly serviced (ie no trapped air or other damage as described) it seems something is most likely out of the correct geometry. I had some suspicion our problem was really something else that we just happened to accidentally fix in the whole ordeal.


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 Post subject: Re: Columbia 400 nose shimmy
PostPosted: 17 Sep 2021, 03:53 
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Username Protected wrote:
88 psi seems high to me, BWTFDIK? Is your nose tire tubeless? I run 45 PSI in the nose tire of my Lancair 235. You really need to join Lancairtalk.net. It's free. There are a lot of knowledgeable people over there and there's a topic on this very question.


It’s a certified airplane, 88psi is in the POH, as well as the fluid in his nose strut, he can’t change from the specs freely like an experimental

The last 400 I saw with a chronic shimmy issue had a damaged/bent attachment on the pivot point from a prior hard landing, matches your behavior perfectly


I owned a Columbia 300 that had a chronic shimmy when I bought it . The previous owner and shop tried 'everything ' with no success.

In the end I discovered that the strut was originally designed to use heavy weight motorcycle fork oil - but .... the Mx Manual states that it needs to be serviced with regular (low visc) hydraulic fluid .

Guess what ? Cured it, instantly.
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 Post subject: Re: Columbia 400 nose shimmy
PostPosted: 17 Sep 2021, 09:58 
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Location: Phoenix, AZ KSDL
Aircraft: Baron G58, Vision Je
I owned a 2005 COL4 for five years. I would recommend joining the type group online. It is almost as good as beechtalk. Secondly I would call Van Bortel and ask for Darryl. He is the most knowledgeable on the type. Good luck


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 Post subject: Re: Columbia 400 nose shimmy
PostPosted: 19 Sep 2021, 00:01 
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Location: $ilicon Vall€y
Aircraft: Columbia 400
Yes, join up here:

https://www.cessnaadvancedaircraftclub.com/forums/

There is also a Service Bulletin about shimmy and how to address it with a wrap around shim on the nose gear cartridge along with some other steps.

The cartridge has been updated a couple of times, there's a repairable and non-repairable version.

88 PSI is the correct pressure on the Columbia 400 nose tire.


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