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  #11  
Old 06-13-2011, 07:15 AM
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Snowflake Snowflake is online now
 
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AC 43.13 is available digitally for free from the FAA website... I don't have a link handy because I'm on my iPad right now, but I've downloaded it a few times from them.
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  #12  
Old 06-13-2011, 07:26 AM
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That's were I got my copy -- last time I downloaded it was just a few weeks ago.

43.13-1B Acceptable Methods, Techniques, and Practices - Aircraft Inspection and Repair dated 1998 and

43.13-2B Acceptable Methods, Techniques, and Practices – Aircraft Alterations dated 2008

-1B is the volume germane to this discusson and is generally the one that everyone is referencing when qutoing 43.13.
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Last edited by Auburntsts : 06-13-2011 at 07:34 AM.
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  #13  
Old 06-13-2011, 11:24 AM
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Default CoastFab

This source might help.

http://www.coastfab.com/torque_fastener_matching.html
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  #14  
Old 06-13-2011, 11:48 AM
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Jerry,
Thanks for the link. Getting closer to an answer I think. Sooo anybody know if the wing attach bolts are tension or shear (I'm guessing shear)? Makes a 200 in-lb difference in torque on a NAS1307 bolt according to the chart on the link in Jerry's post. That's a pretty signifcant difference in my book and not something I want to get wrong.
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  #15  
Old 06-13-2011, 12:16 PM
krw5927 krw5927 is offline
 
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Default Shear

The spar attach bolts are loaded in shear. Double shear, to be technically correct, with the spar sandwiched between the two center section blocks. Here's an example:

http://www.instron.us/wa/solutions/N...exZKvRykObvZx4

Torque for shear.
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Last edited by krw5927 : 06-13-2011 at 12:23 PM.
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  #16  
Old 06-13-2011, 04:57 PM
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Quote:
Originally Posted by krw5927 View Post
The spar attach bolts are loaded in shear. Double shear, to be technically correct, with the spar sandwiched between the two center section blocks. Here's an example:

http://www.instron.us/wa/solutions/N...exZKvRykObvZx4

Torque for shear.
So, I go to the trouble of searching for my old AC 43-13, finding the TORQUE that we've been using for years, give the torque range for everybody so they have it for posterity, and somehow that isn't good enough!
The table I got the torque values from are for steel tension nuts, the nuts that are called for are AN365! STEEL TENSION NUTS!
If you want to use AN364 shear nut torque values make sure you print that on the side of the plane so everybody who rides in your plane will know your plane has LOOSE wings!
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  #17  
Old 06-13-2011, 05:08 PM
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Why are the simplest things never easy? Guess I'll torque to type of nut listed in the table.
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  #18  
Old 06-13-2011, 06:10 PM
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Quote:
Originally Posted by jthocker View Post
If you want to use AN364 shear nut torque values make sure you print that on the side of the plane so everybody who rides in your plane will know your plane has LOOSE wings!
Yep, I'm sure my plane will fall out of the sky.

Torque for tension, won't hurt a thing. The bolts are not primarily loaded in tension, though. This is a shear load configuration.
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Last edited by krw5927 : 06-13-2011 at 06:27 PM.
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  #19  
Old 06-13-2011, 08:15 PM
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GLPalinkas GLPalinkas is offline
 
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Default Thanks for your help Jon

Quote:
Originally Posted by jthocker View Post
So, I go to the trouble of searching for my old AC 43-13, finding the TORQUE that we've been using for years, give the torque range for everybody so they have it for posterity, and somehow that isn't good enough!
The table I got the torque values from are for steel tension nuts, the nuts that are called for are AN365! STEEL TENSION NUTS!
If you want to use AN364 shear nut torque values make sure you print that on the side of the plane so everybody who rides in your plane will know your plane has LOOSE wings!
Jon, Just a quick note to say that I bookmarked your answer right away. You are one of the "Go-To" guys that a lot of people on this site turn to for advice. I wanted you to know that not everyone second guesses your experience ....THANKS
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  #20  
Old 06-13-2011, 08:36 PM
krw5927 krw5927 is offline
 
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Please accept my apologies for "second guessing" a moderator. Sorry, Jon. I have learned my lesson and will not attempt to help others from now on.

Surprised, actually, that such an indignant response came from a mod. Or maybe I didn't understand the tone of the response properly.
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