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  #1  
Old 12-30-2017, 09:11 PM
olegusan olegusan is offline
 
Join Date: Aug 2014
Location: Melbourne, Australia
Posts: 24
Default AB4-6 rivets losing their buttons (SB 14-12-06)

While attaching flaperonís pushrods I found that all of the AB4-6 rivets used in the SERVICE BULLETIN 14-12-06 lost their buttons.

The rivets used to attach F-1206J Angles to the F-1206A Bulkhead.

All 6 buttons were recovered from the bottom of the fuselage.

Is it normal?
Shall I replace them with the longer and possibly stronger rivets





Happy New Year!
Oleg
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Oleg
RV12 # 877
Melbourne, Australia
Build log:www.RV12.com.au
My DIY Avionics: ExperimentalAvionics.com
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  #2  
Old 12-31-2017, 11:23 AM
rvbuilder2002 rvbuilder2002 is offline
 
Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 7,606
Default

Quote:
Originally Posted by olegusan View Post
While attaching flaperon’s pushrods I found that all of the AB4-6 rivets used in the SERVICE BULLETIN 14-12-06 lost their buttons.

The rivets used to attach F-1206J Angles to the F-1206A Bulkhead.

All 6 buttons were recovered from the bottom of the fuselage.

Is it normal?
Shall I replace them with the longer and possibly stronger rivets





Happy New Year!
Oleg
No it is not normal.
I think there is a possibility that the wrong grip length rivets were used.
I don't have plans to look at but I think when the new style bracket gets installed LP4-4 rivets are specified.
What you are seeing would be common if LP4-3 rivets were used.
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Scott McDaniels
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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  #3  
Old 12-31-2017, 06:33 PM
olegusan olegusan is offline
 
Join Date: Aug 2014
Location: Melbourne, Australia
Posts: 24
Default

Hi
Thank you for your reply.

Yes, the rivet next to the button is the LP4-3. I put it in the picture just for dimension reference.

The AB4-6 is MUCH longer. It is about 13mm long (0.525")
I do have two more of them.

The rivet's grip is 8-9.5mm. The thickness of the joint parts is about 8.5mm

Here is another photo from a different angle:
It looks like the shop head has normal size. So it cant be an LP4-X rivet installed by mistake. Longest LP4 rivet is LP4-5 and it is quite a bit shorter than AB4-6.


It seems that the size of the rivet and its grip is correct for the application.
That and the fact that all six of them behaved the same way almost looks like a normal behaviour of this particular rivet.

I wonder if anyone else observed the same effect after having the SB completed.
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Oleg
RV12 # 877
Melbourne, Australia
Build log:www.RV12.com.au
My DIY Avionics: ExperimentalAvionics.com

Last edited by olegusan : 12-31-2017 at 09:42 PM.
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