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  #1  
Old 01-22-2022, 01:08 AM
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Jonnyb Jonnyb is offline
 
Join Date: Jan 2013
Location: UK
Posts: 127
Default Leading Edge to Spar rivets

Am after some advice
I have managed to screw up one of the rivets that goes through the main spar. Itís got to come out, so the question is how. Itís on the 3rd rib in and to make matters worse itís a corner rivet.
Has anyone drilled one of these out? Any special tools or techniques?
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  #2  
Old 01-22-2022, 01:59 AM
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PaulvS PaulvS is offline
 
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Location: Western Australia
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Default Technique

I've drilled out similar but not exactly that location, it's tricky to not elongate the hole and make it even harder to set the new rivet. At least your rivet is only partially set so it should be easier to remove.
The key is to drill exactly perpendicular through the dead centre of the rivet.
I use an automatic centre punch first to emphasize the dot in the factory head.
Then use a sharp pilot drill e.g. 2 mm to go almost all the way through. A square can be clamped beside the rivet to help visually guide the bit to be perpendicular.
If the rib is in the way of the drill motor and cannot be flexed to the side then a 12" long bit may help.
After drilling the pilot hole I drill through just the factory head with a 1/8 bit and use the shank of a drill to snap off the factory head.
Then the rest of the rivet should knock out with a small pin punch. Sometimes I use a blunt panel pin knocking in the bottom of the pilot hole to do this.
Take it slowly and carefully and you can do it!
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  #3  
Old 01-22-2022, 07:12 AM
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acam37 acam37 is offline
 
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Iím not sure how far along you are on your build, but get a copy of AC 43.13-2 or download it to your computer. It has tons of information on just about everything thatís related to aircraft repair and alterations. https://www.faa.gov/documentLibrary/...-1B_w-chg1.pdf
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  #4  
Old 01-22-2022, 07:32 AM
N82VM N82VM is offline
 
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It looks laid over almost as if the hole was not round to start with. Give Vans tech support a call. They may have some good advice for you given the nature of the area.
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  #5  
Old 01-22-2022, 01:43 PM
PhatRV PhatRV is offline
 
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Location: Buena Park, California
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Quote:
Originally Posted by Jonnyb View Post
Am after some advice
I have managed to screw up one of the rivets that goes through the main spar. Itís got to come out, so the question is how. Itís on the 3rd rib in and to make matters worse itís a corner rivet.
Has anyone drilled one of these out? Any special tools or techniques?
I drilled a couple of them out before. It's not unlike other rivet removal but you have to be more careful. I also grind down a plier so it is flush with the surface to grab and to wiggle out the rivet from the squishy end (not the shop head).

Other who had trouble with these rivets had tried using the Cherry Max rivets with great success because you don't have put the rivet gun so close to the spar. Vans also recommends them but you have to check with the tech support.

https://www.walmart.com/ip/6-Lineman...lier/369355465
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  #6  
Old 01-24-2022, 12:16 AM
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Thanks guys, itís coming out today!

Just need to work out how Iím going to get a drill to the manufactured head thatís buried deep in the leading edge, and that I canít see!
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  #7  
Old 01-24-2022, 05:22 AM
Chipper G Chipper G is offline
 
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Might be easier to drill the rib out next to it as well. Sometimes going back makes it easier and actually less time consuming to move forward.
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  #8  
Old 01-24-2022, 06:49 AM
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Jonnyb Jonnyb is offline
 
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Itís out and reset!
Took a load of inspection mirrors at various angles, a head torch, and a 90 degree drill.
Just hope I don't have to do it again!
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  #9  
Old 01-24-2022, 12:37 PM
rsr3 rsr3 is offline
 
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Iím sure Vans approve LP4-3 rivets for the rib to spar rivets. Obviously solid rivets for the leading edge skin to spar cap.
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  #10  
Old 01-24-2022, 08:16 PM
David Z David Z is online now
 
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Location: Thunder Bay Ontario
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Quote:
Originally Posted by rsr3 View Post
Iím sure Vans approve LP4-3 rivets for the rib to spar rivets. Obviously solid rivets for the leading edge skin to spar cap.
LP4-3? Those rivets don't have near the same strength as solid rivets. Cherry Max, I understand.

Do you have anything to back up this post about LP4-3 rivets?
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