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  #1  
Old 04-22-2016, 05:16 PM
Aero_Octaveus Aero_Octaveus is offline
 
Join Date: Aug 2014
Location: Edmonton, AB
Posts: 216
Default To Proseal the tank access nutplates, or not

So the big question of the day is how much of the NAS1473-A08 nutplates and stiffner ring assembly should I proseal. The manual states that I don't have to proseal any of it with the stock setup, but I notice on build logs that lots proseal everything when using the NAS nutplates.

My rib tooling holes are awfully close to the edge of my stiffener ring/access cover. I plan to use seal-tite in lieu of the cork gasket...but I do want to run some proseal between the rib and ring to make sure that the tooling hole is properly sealed.

Question is....Being that I am using the NAS1473 nutplates, Should I proseal anything else?
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RV-7A - Emp and Wings Done. Working on fuse

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  #2  
Old 04-22-2016, 07:03 PM
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wirejock wirejock is offline
 
Join Date: Oct 2005
Location: Estes Park, CO
Posts: 3,947
Default Sealed nut plates

Quote:
Originally Posted by Aero_Octaveus View Post
So the big question of the day is how much of the NAS1473-A08 nutplates and stiffner ring assembly should I proseal. The manual states that I don't have to proseal any of it with the stock setup, but I notice on build logs that lots proseal everything when using the NAS nutplates.

My rib tooling holes are awfully close to the edge of my stiffener ring/access cover. I plan to use seal-tite in lieu of the cork gasket...but I do want to run some proseal between the rib and ring to make sure that the tooling hole is properly sealed.

Question is....Being that I am using the NAS1473 nutplates, Should I proseal anything else?
I used them too. Prosealed the nut plates when installed then slathered sealant all over them. I used tite seal and the cork gasket on the cover. No leaks in the test but no fuel yet.
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Larry Larson
Estes Park, CO
http://wirejockrv7a.blogspot.com
wirejock at yahoo dot com
Donated 12/03/2019, plus a little extra.
RV-7A #73391, N511RV reserved (2,000+ hours)
HS SB, empennage, tanks, wings, fuse, working finishing kit
Disclaimer
I cannot be, nor will I be, held responsible if you try to do the same things I do and it does not work and/or causes you loss, injury, or even death in the process.
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  #3  
Old 04-22-2016, 07:31 PM
David Paule David Paule is offline
 
Join Date: Dec 2009
Location: Boulder, CO
Posts: 4,435
Default

Ditto what Wirejock said, except that I didn't use the cork gasket, directly sealing the hatch cover with access hatch sealant, designed for the job, which I got from Skygeek.com.

After all that cured, I went over all the edges of joints again with type A sealant, which has a thinner viscosity.

No leaks but I haven't flown it yet.

Dave
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  #4  
Old 04-22-2016, 08:41 PM
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N941WR N941WR is offline
 
Join Date: Jan 2005
Location: SC
Posts: 12,887
Default

I used the standard platenuts, so I used the cork gasket and lots of proseal.

One thing I highly recommend is to use capscrews rather than the panhead screws that come with the kit.

That way, if you have to remove the cover plate while the wings are on the plane, you can use an Allen Wrench rather than a stubby screwdriver that may strip the threads.

As you get into the fuselage, start to think about future maintenance. Add plate nuts where getting to a nut will be a challenge or make bracket w/ platenuts as in this example.


(Click to enlarge)
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RV-9 (Yes, it's a dragon tail)
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  #5  
Old 04-22-2016, 10:48 PM
Aero_Octaveus Aero_Octaveus is offline
 
Join Date: Aug 2014
Location: Edmonton, AB
Posts: 216
Default Hmm when in doubt...proseal

Seems like the verdict is in. Better to proseal and be sure rather than try to get cute. Thanks guys. Good call on the screws too. I had anticipated that from all the build logs and went with cadmium plated hex head screws.
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RV-7A - Emp and Wings Done. Working on fuse

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  #6  
Old 04-23-2016, 08:24 AM
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MartinACFactory MartinACFactory is offline
 
Join Date: Jul 2015
Location: Montreal, Quebec, Canada
Posts: 98
Default Do it like the Pro's !

Hi !

For you information, on commercial certified aircraft, all fasteners inside fuel tanks are sealed with sealant, including the dome nutplates.

To save on manufacturing time, PPG came out with pre-form sealant caps. Check this out:
http://www.ppgaerospace.com/getmedia...Flyer.pdf.aspx

Martin
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RV-8 s/n #80414
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MD-RA Pre-closure inspection completed Dec 27, 2019
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