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Couple of questions...

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slook(at)mchsi.com
Guest

Posted: Sat Mar 19, 2011 2:19 pm Post subject: Couple of questions...

I always think of these things on the weekend rather than during the 

week when I can just pick up the phone....



I'm finishing up the upgrades to my center spar 6W4:



Do I put washers under the head and under the nut on the AN4 bolts or 

just under the nut? I see on the plan that just the nut. In the parts 

list drawing it shows both.

I am tempted to go by the plan, but somebody tell me what is "best practice".



What is the torque spec on these A4s? I can't find that anywhere in the docs.



Thanks,

Steve



Steve Look

Monticello, IL

www.ilrt66.com

"Dogs have owners, Cats have staff"

- The Matronics Zenith601-List Email Forum -

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psm(at)ATT.NET
Guest

Posted: Sat Mar 19, 2011 3:24 pm Post subject: Couple of questions...

Hi Steve,



According to the "Bible" AC43.13, AN4 Bolts require between 50 and 70 

inch-pounds with a maximum allowable torque of 100 pounds.  This comes 

from table 7-1 in AC43.13-1B which can probably be found on the FAA web 

site.



I don't think there is any requirement for washers in the realm of "Best 

practice".  You need to use washers to make the bolt finished length 

appropriate.  This means (I think) you should see something like two 

threads past the end of the nut when it is tightened.  I prefer to put a 

single washer under the nut, and if two are needed one under the nut and 

the other under the bolt.  If you need more than two washers you are 

probably using the wrong length bolt and should order the right length.  

You can get any length bolt from Aircraft Spruce, Wicks, or one of many 

other places.



You can also get a bolt gauge for a small fee.  These make it easy to 

tell which length bolt you have in your hand.  You can tell with a 

ruler, but this is a bit tricky.



I recommend you either get a copy of AC43.13-1B and -2A in printed form 

or get in the habit of looking at the online copy on the FAA web site.  

This document tells you everything you ever wanted to know about 

building and repairing aircraft.



Paul

Camas, WA

Just finishing up the upgrade - installing finished carrythrough in 

fuselage.



On 3/19/2011 3:14 PM, Steve Look wrote:

 	  Quote: 	
		   



 I always think of these things on the weekend rather than during the 

 week when I can just pick up the phone....



 I'm finishing up the upgrades to my center spar 6W4:



 Do I put washers under the head and under the nut on the AN4 bolts or 

 just under the nut? I see on the plan that just the nut. In the parts 

 list drawing it shows both.

 I am tempted to go by the plan, but somebody tell me what is "best 

 practice".



 What is the torque spec on these A4s? I can't find that anywhere in 

 the docs.



 Thanks,

 Steve



 Steve Look

 Monticello, IL

 www.ilrt66.com

 "Dogs have owners, Cats have staff"

- The Matronics Zenith601-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?Zenith601-List

carlossa52(at)gmail.com
Guest

Posted: Sat Mar 19, 2011 3:34 pm Post subject: Couple of questions...

Steve, take a look at this web page:

http://www.zenithair.com/kit-data/ra/hardware.html



If the answer is not there, do a little "googling"..

  

Good luck



Carlos

CH601-HD, plans



On 19 March 2011 18:14, Steve Look <slook(at)mchsi.com (slook(at)mchsi.com)> wrote:

[quote]  --> Zenith601-List message posted by: Steve Look <slook(at)mchsi.com (slook(at)mchsi.com)>

 

 I always think of these things on the weekend rather than during the week when I can just pick up the phone....

 

 I'm finishing up the upgrades to my center spar 6W4:

 

 Do I put washers under the head and under the nut on the AN4 bolts or just under the nut? I see on the plan that just the nut. In the parts list drawing it shows both.

 I am tempted to go by the plan, but somebody tell me what is "best practice".

 

 What is the torque spec on these A4s? I can't find that anywhere in the docs.

 

 Thanks,

 Steve

 

 Steve Look

 Monticello, IL

 www.ilrt66.com

 "Dogs have owners, Cats have staff" 

[b]

- The Matronics Zenith601-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?Zenith601-List

jaybannist(at)cs.com
Guest

Posted: Sat Mar 19, 2011 6:08 pm Post subject: Couple of questions...

Steve,

 

 Best practice is to have a washer under the nut, since that is usually the one that is turned.  However, if conditions require that you hold the nut and turn the bolt, then the washer should go under the bolt head.  Another requirement is that the bolt be such a length that the nut will not bottom out on the threads.  Therefore, when the nut is properly torqued, there should be at least two threads showing and no more than three.  You can use up to three washers to help meet those conditions.  The proper torque for an A4 bolt is 50 to 70 inch pounds.  The higher number should be used if it is a self-locking nut.

 

 Jay Bannister..

   

  

   

            	  Quote: 	
		  --> Zenith601-List message posted by: Steve Look <slook(at)mchsi.com (slook(at)mchsi.com)>

I always think of these things on the weekend rather than during the 



week when I can just pick up the phone....

I'm finishing up the upgrades to my center spar 6W4:

Do I put washers under the head and under the nut on the AN4 bolts or 



just under the nut? I see on the plan that just the nut. In the parts 



list drawing it shows both.



I am tempted to go by the plan, but somebody tell me what is "best practice".

What is the torque spec on these A4s? I can't find that anywhere in the docs.



Thanks,



Steve



Steve Look



Monticello, IL



www.ilrt66.com



"Dogs have owners, Cats have staff" 



	
 

     

   [quote][b]

- The Matronics Zenith601-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?Zenith601-List

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