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Question about XL lower nose gear support bolts

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deglass1(at)aol.com
Guest

Posted: Sat Jul 15, 2006 7:33 pm Post subject: Question about XL lower nose gear support bolts

This might be obvious, but is an unusual design practice -

 The 4 bolts AN4H-5A that mount the lower nose gear bearing support 6B8-9 to the nylon bearing appear to require a blind, threaded hole into the nylon block, then they're safety wired to prevent backout.  The bolt length appears to support this, but depending on threaded plastic for pullout strength doesn't sound like good practice without an anchor insert.

 Please advise - are these bolts just threaded into the nylon, and is this OK since there won't be any (or not much) pullout force or shock?

 

 Thanks for all the help this list gives all of us!

 

 David Glass

 Forest (near Lynchburg), VA

 N253DG reserved

 XL fuse, finally finishing the airframe

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nfivesl(at)YAHOO.COM
Guest

Posted: Mon Jul 17, 2006 4:44 am Post subject: Question about XL lower nose gear support bolts

David:



I countersunk mine from the top and bolted them all

the way through with nuts on the bottom. Here's a veiw

from below showing the nuts on the bottom.  

http://www.cooknwithgas.com/5_30_06_Engine_Below.JPG

The countersunk holes on top also hold some grease for

lubrication.  

I don't have a closeup handy of the top. 



I hope this helps,



Scott Laughlin

Omaha, Nebraska

601XL

http://www.cooknwithgas.com/



--- deglass1(at)aol.com wrote:



 	  Quote: 	
		    This might be obvious, but is an unusual design

 practice -

  The 4 bolts AN4H-5A that mount the lower nose gear

 bearing support 6B8-9 to the nylon bearing appear to

 require a blind, threaded hole into the nylon block,

 then they're safety wired to prevent backout. The

 bolt length appears to support this, but depending

 on threaded plastic for pullout strength doesn't

 sound like good practice without an anchor insert.

  Please advise - are these bolts just threaded into

 the nylon, and is this OK since there won't be any

 (or not much) pullout force or shock?

  

  Thanks for all the help this list gives all of us!

  

  David Glass

  Forest (near Lynchburg), VA

  N253DG reserved

  XL fuse, finally finishing the airframe

   



________________________________________________________________________
	


 	  Quote: 	
		   


	




__________________________________________________

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Gig Giacona

Joined: 10 Jan 2006
Posts: 1416
Location: El Dorado Arkansas USA

Posted: Mon Jul 17, 2006 7:28 am Post subject: Re: Question about XL lower nose gear support bolts

I just did this last week and while I was doing it I felt like this was the weakest link I've installed in my aircraft to-date.



I like your idea Scott and I may go redo that next weekend. Is there anyway you can get a photo of the top side and post it?

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_________________
W.R. "Gig" Giacona
601XL Under Construction
See my progress at www.peoamerica.net/N601WR

nfivesl(at)yahoo.com
Guest

Posted: Mon Jul 17, 2006 10:11 am Post subject: Question about XL lower nose gear support bolts

Hi Gig:



I looked through my backup photos and came up with

these two (attached).  It's in a tight spot and engine

parts hide most of it these days.  



Scott Laughlin

www.cooknwithgas.com

Working on canopy



--- Gig Giacona <wr.giacona(at)cox.net> wrote:



 	  Quote: 	
		   I like your idea Scott and I may go redo that next

 weekend. Is there anyway you can get a photo of the

 top side and post it?


	


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