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  #1  
Old 06-02-2012, 01:16 AM
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jenatepilot jenatepilot is offline
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Default Ken Brock Warning help!

CP47, Page 8, reads that Ken sent out some BAD Lift Tabs part #NC-CLT and I'm not sure which ones I have. HOWEVER, I do have a receipt showing part #CLT. See pics. Does ANYONE know if Ken Brock would have included the "NC" at the beginning on his receipts or if I need to replace the tab?

Thanks
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  #2  
Old 06-02-2012, 01:37 AM
tonyslongez tonyslongez is offline
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Default Re: Ken Brock Warning help!

Define "BAD"
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  #3  
Old 06-02-2012, 01:41 AM
ZG4Me ZG4Me is offline
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Default Re: Ken Brock Warning help!

Are the lift tabs installed ??

Rick
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  #4  
Old 06-02-2012, 03:37 AM
Marc Zeitlin Marc Zeitlin is offline
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Default Re: Ken Brock Warning help!

Quote:
Originally Posted by jenatepilot View Post
CP47, Page 8, reads that Ken sent out some BAD Lift Tabs part #NC-CLT and I'm not sure which ones I have. HOWEVER, I do have a receipt showing part #CLT. See pics. Does ANYONE know if Ken Brock would have included the "NC" at the beginning on his receipts or if I need to replace the tab?
The CP certainly gives the impression that there were two different part numbers with two different purposes.

If your lift tabs were purchased for a new build, not a retrofit of a Roncz canard or replacement GU canard to an already flying or built LE, then it makes sense that the P.O. would say "CLT" and not "NC-CLT".

But if you don't have them installed and you want to be 100% sure, just make new ones yourself out of 2024-T3.

You could determine whether you've got 2024-T3 or 2024-0 by bending them and checking the yield strength, but they they'd be unusable anyway.

If they're already installed and you still don't trust the written record, it takes about 3-4 hours to replace them - I've done it in the field on a Long-EZ that ran into a van and bent the tabs, while having about 1/2 the tools I wanted and being out in the 110F sun in Thermal, CA.

If you're doing it in a shop, it should be pretty simple.

Personally, I'd trust the notation, but if you don't, it's not a big deal to swap them out.

One last warning, though - the CP states that you can use either blue foam or X-40 pour foam to fill the space after the swap - DO NOT USE POUR FOAM. Use the blue foam. There is at least one instance of a canard built with pour foam around the lift tabs in which the pour foam caused substantial corrosion (about 80% of the way through) of the lift tab. Use only blue foam and micro to fill the space.
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  #5  
Old 06-02-2012, 09:55 AM
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Default Re: Ken Brock Warning help!

"NC" refers to "new canard", i.e., the Roncz canard. The bad lift tabs (soft 2024-T0) were for retrofits and did not have the hole drilled in the rounded (lower) end.
http://v2.ez.org/cp47-p8.htm
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  #6  
Old 06-02-2012, 11:15 PM
longezdave longezdave is offline
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Default Re: Ken Brock Warning help!

I had purchased my lift tabs for my Roncz canard just before the Ken Brock recall. The best that I can remember, he really wanted to have the "bad" lift tabs back in his hands before sending me the proper lift tabs. I convinced him to send me the new ones while the "bad" ones were being shipped back to him. The point here is that he tried to get all the "bad" lift tabs back in the shop.
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  #7  
Old 06-03-2012, 12:32 AM
Buly Buly is offline
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Default Re: Ken Brock Warning help!

What year was that. The article is from 1986 I believeI bought my tabs 1996-7.
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  #8  
Old 06-03-2012, 07:39 PM
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Default Re: Ken Brock Warning help!

Mine were purchased in 1981 if that helps
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  #9  
Old 06-03-2012, 08:04 PM
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Default Re: Ken Brock Warning help!

If you are concened and are building the Roncz canard, why not just order the tabs from the Cozy Girrrls and be done with it?

$16.50 - $25.00 = peace of mind.

That's a bargain.
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  #10  
Old 06-03-2012, 09:15 PM
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jenatepilot jenatepilot is offline
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Default Re: Ken Brock Warning help!

The canard is already built. I may go that route unless someone can confirm that Ken Brock printed a different product number for the faulty tabs on the receipt.
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  #11  
Old 06-04-2012, 08:07 PM
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Default Re: Ken Brock Warning help!

Everyone thanks for the replies. I've decided that when i pull up hard I want peace of mind and will be buying new ones for CZ. Thanks again guys!
Nate
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  #12  
Old 06-04-2012, 10:03 PM
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Default Re: Ken Brock Warning help!

Been there ......
I was staying awake nights because I wasn't real happy with my canard. Once I decided to rebuild it, I slept great.

The good news was it only took me 10 days to build the new one.
A tip I would pass on to you is this:
Using your template as a pattern, precut your hardpoints and micro them in place before you do your bottom skin.
Much EZ'r.
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