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601 seat belt attachment history.

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airvair601(at)yahoo.com
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Posted: Wed Oct 25, 2006 7:06 am Post subject: 601 seat belt attachment history.

Seat belt attachment history

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  I have a question about the 601HD series seat belt attachment.  This has been discussed some in the achieves and I am hoping to get the info on the real story/history.  Here is why I need to know.  We are getting ready to install the seat pan for the final time. Rivets not celcos, real progress. I bought the finals version of the HDS plans and few months back and when looking for changes and updates we found the thickness of the out board  attachment flange has been thickened  ( from 0.040 to 0.063) and the hole diameter changed. I am wondering why the change and do I really have to drill the 0.04 out and make a new one?  In  keeping with the philosophy of  John and Martha King, I believe my superior planning will help me avoid using my superior skills and thus the seat belt issue is really nothing to worry about.  J But, just in case….

   

  Is the stiffening really is necessary?  Is there an easier retrofit idea, rather than exchanging the flange? Interestingly the final plans leave the inboard attachment  as 0.040.  I am sure there is some interesting history here.  What gives? Phill

   

  phartig(at)mindspring.com (phartig(at)mindspring.com)

   



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Afterfxllc(at)aol.com
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Posted: Wed Oct 25, 2006 10:54 pm Post subject: 601 seat belt attachment history.

I saw the PIC of the seat belt attach that failed after a roll over... That  said it was the point in front of where the bolt goes thru that failed. It was  more a ripping due to the forward pull. The bracket itself did not  detach. Keep in mind that the builder could have drilled the holes closer  to the edge than was called for in the plans making the area in front of the  bolt too thin. I have already installed the original brackets and was  simply going to either make a doubler for the bracket or drill the hole  further back thus giving me more material in front of the hole. 

  

  

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cffd(at)pgrb.com
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Posted: Thu Oct 26, 2006 12:45 pm Post subject: 601 seat belt attachment history.

 

       Message:        

     #41685            From:      "Chuck Deiterich"        <cffd(at)pgrb.com>            Subject:      Re: 701 seat belt attach-Zenith    fix            Date:      Oct 01, 2006 [quote]   



John,



Here is a comment I made previously.



When I    built my 701, I did not feel comfortable with the aluminum seat 

belt    attachment that was riveted to the tunnel.  In fact, somewhere 4 or 5    years ago, on this forum, I read where the bolt between the seat belt and the    aluminum attachment pulled a slot through the attachment.  So I made my    attachment from 0.40" 4130 steel instead of 0.40" 6061 aluminum.  I then    used the 0.40" 6061 as a doubler on the inside of the tunnel to give more    thickness to keep the rivets from pulling through. I did not ask ZAC about    this, but I feel that this is a stronger anchor which actually gets pulled by    both the lap and shoulder straps.



Chuck D.

N701TX



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