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  #1  
Old 01-26-2020, 11:15 PM
dpemmons dpemmons is offline
 
Join Date: Apr 2017
Location: San Francisco, CA (KDVO)
Posts: 38
Default Wear on spar rib angle rivets

I'm currently doing the annual inspection on my 10 year old 320hrs TT RV12 and discovered wear on the LP4-3 rivets that connect the inboard rear rib to the left main spar.

See photos:
Angle: https://photos.app.goo.gl/zU1QMEnBDZEkScWN7
Topmost rivet: https://photos.app.goo.gl/eqRnvbvNeLd6fpb89
Second topmost: https://photos.app.goo.gl/zhgvyAcDqmM2hYTV6
Third rivet: https://photos.app.goo.gl/MQmaZEx9aqUADZzVA
Bottom rivet: https://photos.app.goo.gl/BmNR6KJTFoGbwY8f9
End of Left main spar: https://photos.app.goo.gl/wTmkS1xo119vBtUy7

I'm guessing this wear is due to play in the wings. I've performed the MM Rear Spar Doubler check and measure 0.038" movement in the Left wing and 0.026" in the Right wing. I did the check by myself so I'm unsure how accurate that is, but would seem to indicate some movement. The maintenance manual says 0.050" is acceptable with the new ES-00076 & ES00077 Electrical Connectors but 0.010" with the old UHMW ones.

Last year I installed landing and position lights, but removed the UHMW connector and just wired in a molex connector for the lights. Does anyone know why the new electrical connectors increase the play tolerance? Did I introduce this play by removing the UHMW blocks?
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  #2  
Old 01-27-2020, 06:54 PM
RFSchaller RFSchaller is offline
 
Join Date: Oct 2010
Location: Phoenix, AZ
Posts: 2,639
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Dale,

Have you considered replacing the worn rivets? Won’t fix the wear problem, but at least you will be starting over with full strength rivets.

Rich
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  #3  
Old 01-27-2020, 08:42 PM
dpemmons dpemmons is offline
 
Join Date: Apr 2017
Location: San Francisco, CA (KDVO)
Posts: 38
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Quote:
Originally Posted by RFSchaller View Post
Dale,

Have you considered replacing the worn rivets? Won’t fix the wear problem, but at least you will be starting over with full strength rivets.

Rich
Oh yeah I'm certainly going to do that, but I'd prefer they not end up worn again if I can avoid it.
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Old 01-28-2020, 07:02 AM
bobg56 bobg56 is offline
 
Join Date: Nov 2018
Location: Peachtree City, GA
Posts: 87
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I believe the increased play of .050 vrs. .010 is due to the fact that the new socket design will tolerate more movement before contact is broken. The older method used sets of button head screws that contacted each other. They would easily break contact so that's were the .010 limit comes in. I also replaced those with connector plugs with about 10" of lead wire.
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Old 01-28-2020, 09:22 AM
Bruce Russell Bruce Russell is offline
 
Join Date: Jul 2008
Location: Clayton, GA
Posts: 190
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I had the same problem at the root angle. The opening in the side skins was just a bit too small so I enlarged the opening about 1/8" on the side that was rubbing and the wear went away.
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  #6  
Old 01-28-2020, 10:17 AM
dpemmons dpemmons is offline
 
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Location: San Francisco, CA (KDVO)
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Quote:
Originally Posted by Bruce Russell View Post
I had the same problem at the root angle. The opening in the side skins was just a bit too small so I enlarged the opening about 1/8" on the side that was rubbing and the wear went away.
The opening in the side skins of the fuselage? How did that help?
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  #7  
Old 01-28-2020, 10:25 AM
Azjulian Azjulian is offline
 
Join Date: Dec 2015
Location: Scottsdale, Arizona
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Do you have play in your wing spar pin bushings as well ? Is it passing the test with the tool you get with the kit ?
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  #8  
Old 01-28-2020, 10:32 AM
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TomVal TomVal is offline
 
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Location: SC & CA
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How much wear is there in the lock-pin bushings?

Whoops...the above post beat me to it!
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  #9  
Old 01-28-2020, 11:51 AM
HansLab HansLab is offline
 
Join Date: Jan 2015
Location: Netherlands
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Default tool in the kit??

"Do you have play in your wing spar pin bushings as well ? Is it passing the test with the tool you get with the kit ?"

I bought a project, and can't remember having any tool for measuring the fitting of the wings. Anyone has a pic and/or description of this, please?
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  #10  
Old 01-28-2020, 03:52 PM
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jrtens jrtens is online now
 
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Location: Sandy, Utah
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Quote:
Originally Posted by HansLab View Post
"Do you have play in your wing spar pin bushings as well ? Is it passing the test with the tool you get with the kit ?"

I bought a project, and can't remember having any tool for measuring the fitting of the wings. Anyone has a pic and/or description of this, please?
Page 3-15 of the current MM has a diagram of the measuring device and its use.
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