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  #11  
Old 05-17-2016, 12:18 PM
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rvbuilder2002 rvbuilder2002 is offline
 
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This mark looks just like what can happen when a rivet clinches over badly during installation.
If the rivet then gets removed for replacement, it leaves a very similar mark in the material surface.
Troy, did you possibly remove and replace that rivet during construction?
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  #12  
Old 05-17-2016, 12:29 PM
paul330 paul330 is offline
 
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If you expand the photo and look closely, it appears to be a piece of metal sitting on top. Still think it is a piece of swarf caught in the rivet.....
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  #13  
Old 05-17-2016, 01:12 PM
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TroyBranch TroyBranch is offline
 
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I wish my memory was so good to remember this rivet from 2007/2008 and what I did LOL I must say I am quite proud at how well these rivets look

I will be down to the hanger tomorrow and reach to see/feel, I will also wipe it with thinner to see if it comes off. The next step will be the dye test. Sure would be nice to find out it is nothing.
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  #14  
Old 05-17-2016, 01:25 PM
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JonJay JonJay is offline
 
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Hi Troy -
I might suggest making it part of your annual inspection and move on. Even if it is a crack, it isn't in the area of concern of the SB if I understand it correctly. It isn't going to cause a sudden and catastrophic failure of the spar.
As already mentioned, the odds of making things worse with a repair might not warrant a fix.

I have one area on my RV6 Horizontal Stab subject to a different SB that appears to be a mark from a drill bit wandering. I photo archived all of the locations subject to the SB. I have found no change in the appearance of that anomaly since the SB was issued. I log it as "complied".

If it ever changes in the future, then I will start to be concerned. For now, I firmly believe it was there from day one.

I think you have worried about this one enough. Just my two cents.
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  #15  
Old 05-17-2016, 02:02 PM
danny danny is offline
 
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Default q & d check

(quick & dirty though not so much dirty)
I've used acetone or alcohol to help verify cracks....it gets wicked into the crack and the surface stuff dissipates quickly while the fluid in the crack stays wet and obvious for a while. Find a piece of scrap that's cracked and try it out.
Btw... not a typical shape for a crack.
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  #16  
Old 05-19-2016, 09:22 AM
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TroyBranch TroyBranch is offline
 
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Yesterday I cleaned the area with a scotch brite pad and took this shot. I need to do the dye test to put this to bed. It is to perfect of a curve to be a crack in IMO. But it sure looks like a crack. It goes from hole edge to hole edge. I think a dumped rivet that was removed may have done this but generally the second rivet would not be able to be set perfect. This one is, maybe I just got lucky. It is to long ago for me to know what I did. A dye test will be the only confirmation I think. Not sure what the dye will look like if this is only a gouge. Not sure if it will show the same as if t was a crack.


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  #17  
Old 05-19-2016, 09:57 AM
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flion flion is offline
 
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That looks sooo much like a gouge. The only thing I can think of was when you initially drilled the spar you drilled from that side, without a stop, and the jaws of the chuck touched there.
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  #18  
Old 05-19-2016, 10:18 AM
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TroyBranch TroyBranch is offline
 
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Quote:
Originally Posted by flion View Post
That looks sooo much like a gouge. The only thing I can think of was when you initially drilled the spar you drilled from that side, without a stop, and the jaws of the chuck touched there.
It does look like a gouge. With it being a Quick build wing, you would think I would only drill from the aft side. I am not one to not use a drill stop but maybe. If that was the case, you would think the scratch would be around the perimeter of the hole.
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  #19  
Old 05-19-2016, 10:33 AM
BillL BillL is offline
 
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It looks like a possible mis-strike by the CNC hole punch, if that is even possible. Anyway - I am glad to know there are others like me who like to get to the bottom of things.
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  #20  
Old 05-19-2016, 12:07 PM
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JonJay JonJay is offline
 
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The only reason this is even a discussion is due to the SB and the "accidental" observance of a anomaly not related to the SB. (This rivet location is not what the SB calls out to inspect, correct?). What if this was in the next bay over?

Please don't get me wrong. I admire the thought process of not being satisfied until you are sure. However, I don't think a definitive answer will be discovered. Die penetrant may not be conclusive gouge vs crack. Many have viewed the photos and none of us familiar with seeing cracks feel this exhibits the typical tell tail signs.

Far better to err on the side that a problem exists, but I see nothing wrong with satisfying the SB with observance at the next interval, be it the annual CI or more frequent inspections if you feel they are necessary. I inspected my HS several times the first year that SB went into effect, but after a year and nothing changed, it became a CI inspection once a year.
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