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Aero-net Reuse...

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Matt Dralle
Site Admin

Joined: 08 Nov 2005
Posts: 26320
Location: Livermore CA USA

Posted: Wed May 28, 2008 8:30 am Post subject: Aero-net Reuse...

Hello Listers,



What is the common opinion on the reuse of those aero-nuts with the 

little nylon insert?  Seems like once you use one and take it off the 

strength of the nylon isn't as good any longer.  Is there a 

"recommended" number of uses for them?



Thanks,



Matt

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Bruce(at)glasair.org
Guest

Posted: Wed May 28, 2008 8:52 am Post subject: Aero-net Reuse...

Use once and throw away.



Bruce

www.Glasair.org

 

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sbuc(at)hiwaay.net
Guest

Posted: Wed May 28, 2008 9:43 am Post subject: Aero-net Reuse...

Matt Dralle wrote:

 	  Quote: 	
		   

 

 

 Hello Listers,

 

 What is the common opinion on the reuse of those aero-nuts with the 

 little nylon insert?  Seems like once you use one and take it off the 

 strength of the nylon isn't as good any longer.  Is there a 

 "recommended" number of uses for them?

 

 Thanks,

 

 Matt


	




Matt, the rule-of-thumb I've always heard is as long as the nut still 

has enough resistance that you can't thread it on the bolt by hand it is 

still serviceable.



Sam Buchanan

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seiders(at)bellsouth.net
Guest

Posted: Wed May 28, 2008 3:20 pm Post subject: Aero-net Reuse...

Ditto, Sam.

Dick

At 01:39 PM 5/28/2008, you wrote:

 	  Quote: 	
		  



Matt Dralle wrote:

>

>

>Hello Listers,

>What is the common opinion on the reuse of those aero-nuts with the 

>little nylon insert?  Seems like once you use one and take it off 

>the strength of the nylon isn't as good any longer.  Is there a 

>"recommended" number of uses for them?

>Thanks,

>Matt

Matt, the rule-of-thumb I've always heard is as long as the nut 

still has enough resistance that you can't thread it on the bolt by 

hand it is still serviceable.



Sam Buchanan

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Release Date: 5/28/2008 7:20 AM

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baremetl(at)gvtc.com
Guest

Posted: Wed May 28, 2008 3:50 pm Post subject: Aero-net Reuse...

People with wood props commonly use the elastic stop nuts. I believe that 

most (like me) don't change them every time the bolts are retorqued. It 

would sure be a lot of trouble and expense.



Ivan Haecker    -4  (with wood prop!) 1458 hrs. S. Cen. TX

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AV8ORJWC

Joined: 13 Jul 2006
Posts: 1149
Location: Aurora, Oregon "Home of VANS"

Posted: Wed May 28, 2008 4:30 pm Post subject: Aero-net Reuse...

Doing it and making it right are two entirely different questions.

Paragraph 7-64 f. addresses nylon nuts.  Aviation safety can be

expensive.  They progressively wear and fail to provide the purpose of a

nut, which is retention.  I see it all the time. They most often do not

pass inspection criteria.



Common opinion is what Matt asked for so I will say many things in

Experimental are "penny wise and pound foolish".  It is amazing the risk

one will take to save a few pennies.  From a Quality Control perspective

it is "Use a new one every time" or check the torque...that is the

trouble.  When penny pinching, they will often hold torque 1-3 times

then are trash.  I often find nuts being used on experimentals that are

shot and reused by operators that don't have the baseline knowledge

found in the AC43.13.



John Cox



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baremetl(at)gvtc.com
Guest

Posted: Wed May 28, 2008 9:09 pm Post subject: Aero-net Reuse...

John,



Would you care to provide the inspection criteria you allude to when you say 

that you commonly find nuts on experimentals that are shot and should not be 

reused? I find that 99% of the nuts used on my rv-4 are not covered in Table 

7.2 of AC43.13-1B.



Sincerely,



H. Ivan Haecker    -4  1458 hrs.  S. Cen TX

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wskimike(at)mchsi.com
Guest

Posted: Thu May 29, 2008 4:55 am Post subject: Aero-net Reuse...

The Navy hardware manual doesn't allow reuse of these nuts on any critical 

system like flight controls. Otherwise check the run-on torque for that 

specific nut. I think the Navy goes overboard on this issue because if the 

nut was installed properly and not overtorqued, the run on torque usually is 

good for two or three times. I personally would replace it on critical 

systems after one re-use.



Mike

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Matt Dralle
Site Admin

Joined: 08 Nov 2005
Posts: 26320
Location: Livermore CA USA

Posted: Thu May 29, 2008 7:35 am Post subject: Aero-net Reuse...

At 05:24 PM 5/28/2008  Wednesday, you wrote:

 	  Quote: 	
		  Doing it and making it right are two entirely different questions.

Paragraph 7-64 f. addresses nylon nuts.  

>>

>> What is the common opinion on the reuse of those aero-nuts with the 

>> little nylon insert?  Seems like once you use one and take it off the




	


Thank for all the great feedback, everyone!



Matt

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