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  #1  
Old 11-29-2016, 09:03 PM
KeithB KeithB is offline
 
Join Date: Mar 2014
Location: Granbury, TX
Posts: 163
Default Aileron Hinge Service Bulletin SB 16-03-28

This is a cautionary post for RV-14 builders completing the wing kit and incorporating Service Bulletin 16-03-28 for aileron hinge brackets. It might also apply to the RV-10 as the hinges and SB kit are the same.

When the service bulletin came out for the aileron hinge brackets, I had largely completed the wings, but had not riveted on the bottom skins (to allow for avionics decisions such as auto pilot servo, magnetometer, etc. to be incorporated later). With the bottom skins still open, I felt it was an opportunity to incorporate the revised aileron hinges with limited difficulty (compared to after the wings are closed up), and opted to order and install the retrofit kit.

I drilled out the spar rivets to remove the old hinge, disassembled the hinge to recover the bearing, reassembled the new hinge and riveted it to the spar per the provided instructions. However, when I went to install the aileron back on the wing, the inboard edge of the aileron now contacted the heads of the AN470AD4 rivets used to join the two halves of the new hinge bracket. In retrospect, of course the new hinge is thicker with the addition of a pair of .125 angles. This increased thickness comes out of the distance between the base of the hinge brackets, and out of the clearance between the leading edge of the aileron and the base of the hinge bracket.

I talked to mothership tech support and the fixes proposed were 1) file/bend the aileron skin to clear the rivet heads, 2) swap or substitute washers and/or spacers on the hinge bolts to move the aileron outboard or 3) drill out AN470 rivets in favor of AN426 ones where the heads interfered. After a limited amount of filing, I abandoned 1) as insufficient and unsatisfactory. 2) turned out to be inadequate by itself. So, for 3) I drilled out the two bottom-most AN470AD4 rivets of the 5 joining the hinge bracket halves, then countersunk the angle and replaced with AN426AD4-11 rivets (yes, they are that long). The upper 3 rivets were okay. In addition, on one aileron, I also needed to reposition washers and modify the spacer to better center the aileron between the two hinge brackets. It ends up a tighter fit than before the hinge bracket replacement, but it works.

I would recommend all 5 AN470AD4 rivets be replaced with AN426AD4 rivets when joining the halves of the new inboard aileron hinge brackets. Some adjustment of spacer/washers may still be required.

I apologize for the quality of the photos.





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  #2  
Old 12-01-2016, 04:30 AM
ShortSnorter ShortSnorter is offline
 
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Location: NOLA
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Thanks for the update, I too opted to implement the SB now (bottom skins off), except I only completed the left side so far and have not finished the ailerons. Those new brackets are definitely stout!!
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  #3  
Old 12-01-2016, 12:54 PM
salto salto is offline
 
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Location: Wee Waa Australia
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Great observation, I noticed the same issue and thought I would just file my way out of trouble.
The 426-11 will hopefully be described in an amendment to the service bulletin.
Thanks for chasing this up. 👍
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  #4  
Old 12-01-2016, 01:36 PM
MED MED is offline
 
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Location: Aiken, SC
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I wonder how this is addressed in the QB wings?
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  #5  
Old 11-23-2017, 04:41 PM
HHKing HHKing is offline
 
Join Date: Sep 2014
Location: Aiken, SC
Posts: 9
Default QB Wings

Just put the Left Aileron on and I have contact by the skin on the 470 rivet heads. I think I may be able to file the skin to relieve the contact per 1) above. Really don't want to drill out those -11's!

Last edited by HHKing : 11-23-2017 at 04:44 PM.
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  #6  
Old 03-18-2018, 11:47 PM
bobhope2505 bobhope2505 is offline
 
Join Date: Oct 2014
Location: West Sacramento, CA
Posts: 59
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I went for it and replaced the bottom three 470-4 rivets. Due to the length of the rivets it was difficult to drill them out cleanly. There's not enough clearance to use a drill. The 90 degree drill attachment did the trick.
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  #7  
Old 04-19-2018, 01:30 PM
unitink72 unitink72 is offline
 
Join Date: Oct 2014
Location: Cedar Rapids, IA
Posts: 147
Default Update

Looks like the mothership did indeed update this SB to use flush rivets.

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  #8  
Old 04-20-2018, 10:55 PM
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kiljoy kiljoy is offline
 
Join Date: Sep 2014
Location: San Francisco
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One other thing about that bulletin. You find with the new bracket in place (if you followed the directions and already had the 470 rivets) that you need to either change to 426 rivets, or shave off a few hundredths off the top of the 470s. Still one thing that I saw is that because of the spacing that the bellcrank to aileron push rod was starting to rub on the new bracket when in the max down position. Here's a poor picture of what I mean:



With a combo of shaving the tops of the rivets and removing any excess skin from the edge of the aileron I was able to move the aileron about .065 inboard resulting in a little space between the aileron bracket and push rod.
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  #9  
Old 05-03-2018, 11:36 PM
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HAL Pilot HAL Pilot is offline
 
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Just got my instructions and parts. I'm doing a new build. Before I go through the mental gymnastics of how to do this with a new build has any one done so?
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  #10  
Old 05-04-2018, 05:27 AM
RV6-KPTW RV6-KPTW is offline
 
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Location: Sebastian Fl X26
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Yes - I recollect it being simple substition.
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