18 Apr 2024, 22:51 [ UTC - 5; DST ]
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Post subject: Re: Columbia 400 nose shimmy Posted: 16 Sep 2021, 09:15 |
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Joined: 07/24/19 Posts: 18 Post Likes: +7 Company: CAV Ice Protection Location: New Century, KS
Aircraft: Columbia 400
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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.
_________________ Operations Manager CAV Ice Protection
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Post subject: Re: Columbia 400 nose shimmy Posted: 16 Sep 2021, 13:11 |
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Joined: 12/03/17 Posts: 8164 Post Likes: +8695 Location: Brevard, NC
Aircraft: Lancair LNC2 - SOLD
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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 Posted: 16 Sep 2021, 14:16 |
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Joined: 07/24/19 Posts: 18 Post Likes: +7 Company: CAV Ice Protection Location: New Century, KS
Aircraft: Columbia 400
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Username Protected wrote: What tire and pressure? Goodyear Flight Special II 5.00-5 88PSI
_________________ Operations Manager CAV Ice Protection
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Post subject: Re: Columbia 400 nose shimmy Posted: 16 Sep 2021, 18:36 |
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Joined: 08/14/13 Posts: 6072 Post Likes: +4650
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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
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Post subject: Re: Columbia 400 nose shimmy Posted: 16 Sep 2021, 19:26 |
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Joined: 12/03/17 Posts: 8164 Post Likes: +8695 Location: Brevard, NC
Aircraft: Lancair LNC2 - SOLD
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Username Protected wrote: ...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 Posted: 16 Sep 2021, 19:43 |
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Joined: 08/14/13 Posts: 6072 Post Likes: +4650
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Username Protected wrote: ...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 Posted: 16 Sep 2021, 21:12 |
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Joined: 01/22/19 Posts: 886 Post Likes: +664 Location: KFXE
Aircraft: PA23-250
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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.
_________________ A&P/IA/CFI/avionics tech KFXE Cirrus aircraft expert
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Post subject: Re: Columbia 400 nose shimmy Posted: 17 Sep 2021, 03:53 |
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Joined: 12/18/12 Posts: 787 Post Likes: +399 Location: Europe
Aircraft: Aerostar 600A
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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.
_________________ A&P/IA P35 Aerostar 600A
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Post subject: Re: Columbia 400 nose shimmy Posted: 17 Sep 2021, 09:58 |
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Joined: 01/07/19 Posts: 301 Post Likes: +80 Location: Phoenix, AZ KSDL
Aircraft: Baron G58, Vision Je
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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 Posted: 19 Sep 2021, 00:01 |
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Joined: 01/30/09 Posts: 3353 Post Likes: +1962 Location: $ilicon Vall€y
Aircraft: Columbia 400
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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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