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Rough engine
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toaster73(at)embarqmail.c
Guest

Posted: Mon Feb 11, 2013 5:54 pm Post subject: Rough engine

I am glad to hear a root cause was identified and a safe landing was made. 



This incident raised a curiosity in me regards to the safety wire. I have

checked my bolts in the last 50 hours and they are fine. They have safety

wire on them but when I removed the safety wire to remove the plate the

bolts were torqued and had plenty of break away torque. So the safety wire

in theory was not "doing anything". 

Question is are we suffering from an inappropriate or non-existent torque

value or the need for an initial torque and then a follow-on torque at some

period? The idea being that a proper assembly procedure will never require

the services of the safety wire (although it would always be safetied).

-Chris



N919AR



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flying-nut(at)cfl.rr.com
Guest

Posted: Mon Feb 11, 2013 6:12 pm Post subject: Rough engine

On 2/11/2013 8:53 PM, Chris wrote:

 	  Quote: 	
		   



 I am glad to hear a root cause was identified and a safe landing was made.



 This incident raised a curiosity in me regards to the safety wire. I have

 checked my bolts in the last 50 hours and they are fine. They have safety

 wire on them but when I removed the safety wire to remove the plate the

 bolts were torqued and had plenty of break away torque. So the safety wire

 in theory was not "doing anything".

Well, maybe it was.  Safetied properly the bolt will not loosen due to 
	


vibration.  In the absence of safety wire ..... all bets are off.  I 

don't want to be the one to research the law of averages ....

 	  Quote: 	
		     Question is are we suffering from an inappropriate or non-existent torque

 value or the need for an initial torque and then a follow-on torque at some

 period? The idea being that a proper assembly procedure will never require

 the services of the safety wire (although it would always be safetied).

Proper assembly requires proper torque and safety wire if there's any 
	


way the parts being clamped can be worn or squished in operation.  If 

you absolutely don't want stuff to come apart ... use the safety wire.  

All those nutplates or safety nuts you installed .... are subject to 

fastener loosening due to vibration.  Another good reason to have your 

engine dynamically balanced.

Linn



 	  Quote: 	
		   -Chris



 N919AR

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jdriggs49(at)msn.com
Guest

Posted: Mon Feb 11, 2013 6:12 pm Post subject: Rough engine

After seeing what one small bolt did to Leon's #1 cylinder I will make sure that all my bolts within the airflow to the engine are safety wired and not rely on torque or torque seal to maintain the bolt grip. There is a lot of vibration on these engines and over a period of time it could loosen the fillings in your mouth!  

[quote] From: toaster73@embarqmail.com

 To: rv10-list@matronics.com

 Subject: RE: RV10-List: Re: Rough engine

 Date: Mon, 11 Feb 2013 20:53:19 -0500

 --> RV10-List message posted by: "Chris" <toaster73@embarqmail.com>

 I am glad to hear a root cause was identified and a safe landing was made. 

 This incident raised a curiosity in me regards to the safety wire. I have

 checked my bolts in the last 50 hours and they are fine. They have safety

 wire on them but when I removed the safety wire to remove the plate the

 bolts were torqued and had plenty of break away torque. So the safety wire

 in theory was not "doing anything". 

 Question is are we suffering from an inappropriate or non-existent torque

 value or the need for an initial torque and then a follow-on torque at some

 period? The idea being that a proper assembly procedure will never require

 the services of the safety wire (although it would always be safetied).

 -Chris

 N919AR

 --

- The Matronics RV10-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?RV10-List

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