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11-01-2016, 12:20 PM
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Super Moderator
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Join Date: May 2005
Location: Locust Grove, GA
Posts: 2,626
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Check those AFT Spar bolts
It seems that about 40%-50% of the RVs on which I perform CI's or prebuys have the wrong bolt/nut combination on the aft spar. The aft spar actually has some movement on it during flight loads, and can move. Therefore it requires a drilled bolt, castellated nut, and cotter key. Most of the ones I see have a fiber locking nut on them. Some even have the fiber nut on the drilled bolt!
I'd post a picture but I think it is pretty self-explanatory. Most of the RV's can be checked with a flashlight by crawling underneath and looking past the flap. It is also very easy to remove the last two screws on the wing root fairing and peel it back to inspect.
Vic
__________________
 Vic Syracuse
Built RV-4, RV-6, 2-RV-10's, RV-7A, RV-8, Prescott Pusher, Kitfox Model II, Kitfox Speedster, Kitfox 7 Super Sport, Just Superstol, DAR, A&P/IA, EAA Tech Counselor/Flight Advisor, CFII-ASMEL/ASES
Kitplanes "Unairworthy" monthly feature
EAA Sport Aviation "Checkpoints" column
EAA Homebuilt Council Chair/member EAA BOD
Author "Pre-Buy Guide for Amateur-Built Aircraft"
www.Baselegaviation.com
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11-01-2016, 12:38 PM
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Join Date: Jan 2005
Location: St. Paul, MN.
Posts: 4,792
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Just to clarify, you're talking about the bolt connecting the spar to the fuselage "fork"?
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11-01-2016, 02:32 PM
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Super Moderator
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Join Date: May 2005
Location: Locust Grove, GA
Posts: 2,626
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Quote:
Originally Posted by LettersFromFlyoverCountry
Just to clarify, you're talking about the bolt connecting the spar to the fuselage "fork"?
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Yes.
Vic
__________________
 Vic Syracuse
Built RV-4, RV-6, 2-RV-10's, RV-7A, RV-8, Prescott Pusher, Kitfox Model II, Kitfox Speedster, Kitfox 7 Super Sport, Just Superstol, DAR, A&P/IA, EAA Tech Counselor/Flight Advisor, CFII-ASMEL/ASES
Kitplanes "Unairworthy" monthly feature
EAA Sport Aviation "Checkpoints" column
EAA Homebuilt Council Chair/member EAA BOD
Author "Pre-Buy Guide for Amateur-Built Aircraft"
www.Baselegaviation.com
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11-01-2016, 03:09 PM
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Join Date: Apr 2011
Location: Cincinnati, OH
Posts: 2,791
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and if they are not drilled perfectly square put a set of spherical washers on them.
__________________
Steve Melton
Cincinnati, OH
RV-9A, Tip-up, Superior O-320, roller lifters, 160HP, WW 200RV, dual impulse slick mags, oil pressure = 65 psi, EGT = 1300F, flight hours = 800+ for all
Simplicity is the art in design.
My Artwork is freely given and published and cannot be patented.
www.rvplasticparts.com
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11-01-2016, 06:09 PM
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Join Date: Jun 2005
Posts: 846
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Nuts
Mine has fiber nuts with torque seal no movement.Will watch.
Bob
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11-01-2016, 07:14 PM
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Join Date: Oct 2005
Location: Estes Park, CO
Posts: 3,947
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Plans
Quote:
Originally Posted by vic syracuse
It seems that about 40%-50% of the RVs on which I perform CI's or prebuys have the wrong bolt/nut combination on the aft spar. The aft spar actually has some movement on it during flight loads, and can move. Therefore it requires a drilled bolt, castellated nut, and cotter key. Most of the ones I see have a fiber locking nut on them. Some even have the fiber nut on the drilled bolt!
I'd post a picture but I think it is pretty self-explanatory. Most of the RV's can be checked with a flashlight by crawling underneath and looking past the flap. It is also very easy to remove the last two screws on the wing root fairing and peel it back to inspect.
Vic
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My 7a plans clearly show bolt, washer, nut and cotter pin.
__________________
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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11-01-2016, 08:00 PM
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Join Date: Oct 2012
Location: Clearwater, FL KCLW
Posts: 1,281
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Quote:
Originally Posted by wirejock
My 7a plans clearly show bolt, washer, nut and cotter pin.
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I think the plans have always had it, but my guess is that a lot of people get to that point in the build, and have gained enough confidence that they stop consulting the plans for a lot of things...I know I caught a few mistakes of my own after going back and looking at the plans that I had earlier just skimmed over.
Chris
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Chris Johnson
RV-9A - Done(ish) 4/5/16! Flying 4/7/16
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11-01-2016, 09:21 PM
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Join Date: Jul 2013
Location: US
Posts: 2,251
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Quote:
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my guess is that a lot of people get to that point in the build, and have gained enough confidence that they stop consulting the plans for a lot of things
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This may sound like OCD, or maybe it's just a side effect of the rigorous engineering we do at work, but...
Prior to the DAR inspection, I photocopied all of the preview plans, and then went over them and verified that each and every item on every page, including each of the detailed drawing, hardware callouts, etc., had been done IAW the plans (or there was a very good reason for a variance), checking off on paper every item.
If I missed anything, it wasn't for lack of trying to verify every item! 
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11-02-2016, 06:06 AM
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Super Moderator
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Join Date: May 2005
Location: Locust Grove, GA
Posts: 2,626
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Quote:
Originally Posted by 6 Gun
Mine has fiber nuts with torque seal no movement.Will watch.
Bob
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Why wouldn't you replace it with the correct combination? Takes about 10 minutes per side.
Vic
__________________
 Vic Syracuse
Built RV-4, RV-6, 2-RV-10's, RV-7A, RV-8, Prescott Pusher, Kitfox Model II, Kitfox Speedster, Kitfox 7 Super Sport, Just Superstol, DAR, A&P/IA, EAA Tech Counselor/Flight Advisor, CFII-ASMEL/ASES
Kitplanes "Unairworthy" monthly feature
EAA Sport Aviation "Checkpoints" column
EAA Homebuilt Council Chair/member EAA BOD
Author "Pre-Buy Guide for Amateur-Built Aircraft"
www.Baselegaviation.com
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11-02-2016, 06:35 AM
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Join Date: Jan 2005
Location: Charlottesville, Virginia
Posts: 1,230
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Thanks
Thanks for the Tip...or Heads Up VIC!
It was a pleasure to meet you in LKU for the RV-7 pre-buy!
I learned things from your visit!
Look forward to seeing you at a fly-in.
__________________
Bob Martin
RV-6, 0-360 Hartzell C/S, Tip up, 1200+TT
James extended cowl/plenum, induction, -8VS and Rudder. TSFlightline hoses. Oregon Aero leather seats.
D100-KMD150-660-TT ADI2- AS air/oil seperator. Vetterman exhaust with turndown tips.
Louisa, Virginia KLKU N94TB
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