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11-28-2012, 01:01 PM
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Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,035
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Quote:
Originally Posted by rgmwa
That's what I was expecting, but I can't get my fuzzy "structures" head around how this takes the step issue out of it (home with the flu).  I'll go back and have another look.
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The information I have is that of the airplanes that did have any evidence of cracks, only one of those had any amount of step at the bolt locations (and then only on one side).
The photo of crack damage included in the S.B. document is not of a center section with a step. You can clearly see a imprint mark left by the full circumference of the washer.
The step is not being considered a factor considering the known loads and the testing results. This is particularly the case, after the S.B. modification has been installed.
As the S.B. states, all indicators are that the airplanes that received damage was because of excessively loose bolts, probably stemming from inadequate torque / stretch pre-load at installation (The reason the installation process has been changed, and the PAP amended to require re-torquing the bolts after completing the flight test period).
Last edited by rvbuilder2002 : 11-28-2012 at 01:05 PM.
Reason: typo
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11-28-2012, 01:18 PM
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Join Date: Feb 2010
Location: Perth, Western Australia
Posts: 1,647
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Thanks Scott. In my case, the step occurs in all four locations and is about 0.02" high. The resulting loss of bearing area on that side is relatively small, so if Vans are not concerned, I'll stop worrying about it.
__________________
rgmwa
RV-12LR 912ULS
120346
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11-28-2012, 01:38 PM
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Join Date: Oct 2010
Location: La Feria Texas
Posts: 3,822
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My "steps" are of different dimensions on all four holes. I am considering putting a washer in my mill, and machining off the exact amount of the step. Something to do while I am waiting for my kit and it will make me feel better I suppose. I can agree that the step is probably insignificant in terms of causing a problem, as Scott said, the photo in the SB shows fairly severe cracking and yet the washer obviously was laying flush..
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11-28-2012, 03:48 PM
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Join Date: Jun 2009
Location: Dayton, OH
Posts: 838
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Brake fluid
Thanks Tony,
Nice to know that! Yep, I used the right stuff. 93 Octane UL does take Imron off, though-- some how cuts through the epoxy primer and then blisters the paint!!
Wayne
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11-28-2012, 08:25 PM
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Join Date: Apr 2011
Location: san rafael
Posts: 110
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grind the bevels
Quote:
Originally Posted by Dgamble
Step 32: Add bevels to the four corners of the U-1202 Outboard Main Gear Attach Brackets.
Has anyone done this yet, and if so, how? My first inclination is to take the grinding wheel to it, but my first inclination is almost always wrong.
Problem here is that I don't have a Plan B.
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yes a grinder works great.
they parts get hot easily taking off that much material,
so go slow, I didn't quench mine because I didn't want any hardening of the material, I just did it slow.
then polish with scotchbrite prime and paint
http://2.bp.blogspot.com/-GH07KTZ49Y...0/IMG_6649.jpg
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11-28-2012, 08:42 PM
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Join Date: Apr 2011
Location: san rafael
Posts: 110
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fix for the channel "step"
Quote:
Originally Posted by Bob Kibby
It is my understanding that the SB fix has taken the "step" issue out of the problem. It is also (IMHO) why the doublers are located on the bottom of the C-Section instead of the top of the C-Section which would have been an easier installation. I have noticed from the photos of C-Section cracks (Fig 16 of the SB for example) that all of them appear to have a "step" in the bolt hole cut-out area. I have a step at all 4 bolt hole cut-outs and have 2 cracks at the right forward bolt hole and 1 crack at the left forward bolt hole. The "step" may not be the only reason that some of us have cracks but I do believe that it is a significant contributor to our landing gear damage. Maybe a "structures guy" could comment on my speculation. I have received the SB Kit and it looks stout! Bob Kibby "N712BK"
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It looks like F1204V fixes the step by laying flat over it
can someone who actually has the kit confirm that?
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11-28-2012, 09:31 PM
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Join Date: Mar 2008
Location: Texas
Posts: 1,378
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Quote:
Originally Posted by tim walter
It looks like F1204V fixes the step by laying flat over it
can someone who actually has the kit confirm that?
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Bob Kibby does indeed have the kit.
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11-28-2012, 09:56 PM
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Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,035
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Quote:
Originally Posted by tim walter
It looks like F1204V fixes the step by laying flat over it
can someone who actually has the kit confirm that?
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The F-1204V is not an added part, it is a drill template used in preparation for installing the parts.
The step by step instructions explain its use on page 17.
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11-29-2012, 02:24 PM
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Join Date: Apr 2011
Location: san rafael
Posts: 110
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Quote:
Originally Posted by rvbuilder2002
The F-1204V is not an added part, it is a drill template used in preparation for installing the parts.
The step by step instructions explain its use on page 17.
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yes I see that now.
oh well, Vans must not be concerned with the step
I personally think it should be flat, they should certainly think about refining the design there.
I might try and file mine flatter, maybe with a dremel I can make a circular flat spot for the washer....
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11-29-2012, 03:34 PM
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Join Date: Dec 2008
Location: Lacey, WA
Posts: 1,365
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No way...
No Way Tim, should you attempt to re-machine the center section by hand with a dremel tool. Consider the consequences if you muck it up.
Please re-read post #61. Van's has done the engineering, the testing, and designed a fix that in their own words (in post #61 and an email to me in response to a picture I sent them) makes the step a non-issue.
It's not like it got little attention, this took them weeks of resources. I don't understand why folks are having such a hard time believing them on this matter  .
Tony
__________________
Tony
E-LSA RV-12 ULS
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