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  #1  
Old 03-29-2020, 03:17 PM
Piper J3's Avatar
Piper J3 Piper J3 is offline
 
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Location: Hinckley, Ohio
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Default Bolt Head Rubbing on Wire Bundle Hold-Down Plate

My friend?s RV-12 built by Synergy as an E-LSA has a rod-end bolt head rubbing on the wire bundle hold-down plate beneath it. We put Teflon tape on top of the plate and it didn?t solve the problem. The wire hold-down plate is raised up because of so many wires ? main wire harness, ADS-B antenna Coax, Comm Coax, AOA tubing, etc.

Anybody else seen this? Suggestions?



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Jim Stricker - EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC N86203
1130 hrs Flying 46 Piper J-3 Cub N6841H
Bought Flying RV-12 #120058 Oct 2015 with 48TT - Hobbs now 750

LSRM-A Certificate 2016 for RV-12 N633CM
Special Thanks... EJ Trucks - USN Crew Chief A-4 Skyhawk
MJ Stricker (Father - CFI) - USAAF 1st Lt. Captain B-17H
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  #2  
Old 03-29-2020, 03:31 PM
Harvey rv12 Harvey rv12 is online now
 
Join Date: Apr 2015
Location: Olympia WA
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When I installed ads-b in antenna coax cable, i had the same problem, lots of wires/tubes in a small area. I ended up adding another nylon block just forward of the block you show, and added a 3rd screw to hold everything flat. When done, I was confident the bundle would not interfere with primary flight controls and nothing would chafe the bundle.
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RV-12, bought flying
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Olympia WA

the bitterness of poor quality
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  #3  
Old 03-30-2020, 10:06 AM
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Piper J3 Piper J3 is offline
 
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Quote:
Originally Posted by Harvey rv12 View Post
When I installed ads-b in antenna coax cable, i had the same problem, lots of wires/tubes in a small area. I ended up adding another nylon block just forward of the block you show, and added a 3rd screw to hold everything flat. When done, I was confident the bundle would not interfere with primary flight controls and nothing would chafe the bundle.
Any change you have photo of new Nylon block?
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Jim Stricker - EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC N86203
1130 hrs Flying 46 Piper J-3 Cub N6841H
Bought Flying RV-12 #120058 Oct 2015 with 48TT - Hobbs now 750

LSRM-A Certificate 2016 for RV-12 N633CM
Special Thanks... EJ Trucks - USN Crew Chief A-4 Skyhawk
MJ Stricker (Father - CFI) - USAAF 1st Lt. Captain B-17H
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  #4  
Old 03-30-2020, 10:51 AM
Harvey rv12 Harvey rv12 is online now
 
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Location: Olympia WA
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The block came from Van's with the ADS-b in install kit. I milled it slightly to better accept all tubes/wires. I'm opening up the plane next week for condition inspection, will get a pic then.
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RV-12, bought flying
Hoskins Field, 44T
Olympia WA

the bitterness of poor quality
lingers long after the cheap
price is forgotten.
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  #5  
Old 03-30-2020, 10:52 AM
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Piper J3 Piper J3 is offline
 
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Thanks. Much appreciated...
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Jim Stricker - EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC N86203
1130 hrs Flying 46 Piper J-3 Cub N6841H
Bought Flying RV-12 #120058 Oct 2015 with 48TT - Hobbs now 750

LSRM-A Certificate 2016 for RV-12 N633CM
Special Thanks... EJ Trucks - USN Crew Chief A-4 Skyhawk
MJ Stricker (Father - CFI) - USAAF 1st Lt. Captain B-17H
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  #6  
Old 03-30-2020, 11:03 AM
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Tony_T Tony_T is offline
 
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Location: Lacey, WA
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Jim,
There was a running change along the way to the upper nylon systems block. The earlier -12's both the upper and lower blocks were the same part# F-1276C. After the change the upper block is part# F-1276D and it has a larger cut out for the wire bundle. I found that even after installing the ADSB-in coax in the bundle the wires could be arranged carefully and the F-1276D top block could be installed without that upward bulge I see in your picture. Even so, it will be a rather tight fit but it should work.
Also the F-00049 Wire Cover Plate in your photo is poorly shaped and bent.



If everything is installed correctly there should be no rubbing but it will be very close. You may want to dissasseble and reinstall according to plans.
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Last edited by Tony_T : 03-30-2020 at 11:06 AM.
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  #7  
Old 03-30-2020, 11:14 AM
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Tony_T Tony_T is offline
 
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Also, what is that large black cable in your picture? I don't recall anything like that being in the bundle. There isn't room for anything extra in that system block.
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E-LSA RV-12 ULS
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  #8  
Old 03-30-2020, 12:15 PM
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Piper J3 Piper J3 is offline
 
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Not my airplane - belongs to a friend. My guess is black tubing for AOA?
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Jim Stricker - EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC N86203
1130 hrs Flying 46 Piper J-3 Cub N6841H
Bought Flying RV-12 #120058 Oct 2015 with 48TT - Hobbs now 750

LSRM-A Certificate 2016 for RV-12 N633CM
Special Thanks... EJ Trucks - USN Crew Chief A-4 Skyhawk
MJ Stricker (Father - CFI) - USAAF 1st Lt. Captain B-17H
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  #9  
Old 03-30-2020, 12:44 PM
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Quote:
Originally Posted by Piper J3 View Post
Not my airplane - belongs to a friend. My guess is black tubing for AOA?
I suspect you are right although the PT-035X1/4 plastic tubing supplied in the AOA installation kit is white.
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  #10  
Old 03-31-2020, 12:16 PM
Rrhsch Rrhsch is offline
 
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Location: Oconomowoc, WI
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Jim,

I had the same problems as you. I have a VOR antenna coax added to the mix of wires. I removed the flaperon mixer, wire cover and wire block covers. I was able to widen the slot in the nylon wire blocks to give me a little more space (1/8”) for the wires. I did this with the wires removed from the slot. I took a piece of hacksaw blade and angle notched out the left and right side of the slot. I did this to both the front and back nylon wire bocks.

You have another problem you missed. I can see in your picture that your flaperon mixer arm is also rubbing. I removed the flaperon mixer arms. (Section 21). I removed just enough material from the the bottom legs of the “U” arm (Only in the area of concern) to clear the wire cover plate (.040”). I polished the legs so that if they ever touched the wire cover, gulling would not be a issue.

It is important to try to line up all the wires going between the wire blocks so that they are all in single file, do not allow wires to cross each other. they should lie parallel to the floor (height left and right are the same). Re-bend the wire cover to cover the wires between the bocks. I added a .020” aluminum angle over the cover of the forward block to stiffen it. The leg of the angle is on the forward side. I The can email you a picture. I am unable to post pics.

What I did is totally experimental and was not Van’s approved, so do it at your own risk. Good luck.
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