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Old 08-21-2012, 10:50 AM
tkatc's Avatar
tkatc tkatc is offline
Join Date: Nov 2007
Location: NJ
Posts: 1,747
Wink Oops, is this considered a lightening hole?

As I was dimpling the bottom rib of the rudder, I wondered how some builders could POSSIBLY make the figure 8 mistake. I thought it could never happen to me.... well, it didn't, but I came very close. I made a lightening hole!!

I flattened the dimple with the rivet gun and it looks pretty good. I am inclined to press on but wanted to run it by the masses. The original hole remains intact and not affected. Even the edge distance is borderline acceptable.
My ATC opinion is NOT an official FAA recognized opinion, so any advice you get from me is ONLY my opinion.

Track my RV7A!!

Bought my flying -7A
Building an -8! (Fuse)
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Old 08-21-2012, 11:23 AM
Vlad's Avatar
Vlad Vlad is offline
Join Date: Oct 2008
Location: Utah
Posts: 8,440

Don't worry I have special mutant double head rivet for that. Will sell cheap no will trade for a flammable from that fridge of yours
Where is N666BK?

Не имей сто рублей, а имей сто друзей.
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Old 08-21-2012, 11:55 AM
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JonJay JonJay is offline
Join Date: Jan 2007
Location: Battleground
Posts: 4,348

Let me guess; you where using a pnuematic dimpler?

As long as you have the edge distance between holes and the edge, you have nothing to worry about. Debur the hole and move on.
Smart People do Stupid things all the time. I know, I've seen me do'em.

RV6 - Builder/Flying
Bucker Jungmann
Fiat G.46 -(restoration in progress, if I have enough life left in me)
RV1 - Proud Pilot.
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Old 08-21-2012, 12:20 PM
Bill Phillips Bill Phillips is offline
Join Date: Dec 2006
Location: Forsyth, GA
Posts: 219
Default Don't worry

I figure I had an even half dozen such non structural devits over the many years and two planes. JB Weld is the answer. Move on & good luck, Bill
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Old 08-21-2012, 01:26 PM
paul mosher
Posts: n/a
Default hole

Ah yes the love affair with JBWeld continues. Just debur the hole and move on.
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Old 08-21-2012, 02:02 PM
humptybump humptybump is offline
Join Date: Feb 2011
Location: USA
Posts: 3,181

I have lots of advice to exchange for refrigerated flamables!
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Old 08-21-2012, 02:06 PM
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bpattonsoa bpattonsoa is offline
Join Date: Apr 2005
Location: Indepenence, Oregon
Posts: 375

I have a rule that an "extra" hole that is left alone is a lightening hole. If
I can put a rivet in it, it becomes a BAR, "Builder Added Reinforcement"
Bruce Patton
Rans S-20 Raven 796S flying since 2019 (slowly)
RV-6A 596S flying since '89 (Sold)
HP-18 5596S flying since '83
RV-10 996S flying since 2014, quick build wing and slow build fues., - dual Skyviews with complete system, two radio and not much else. Interior completely finished with Zolatone. CF plenum. 1624 lbs, FLYING after a 21.5 month build.
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Old 08-21-2012, 04:00 PM
alpinelakespilot2000 alpinelakespilot2000 is offline
Join Date: Jan 2005
Posts: 3,728

It's probably OK as is, but if it were mine, I would put on .032 or .040 backing/doubler strip on the inside rib flange capturing at least both the rivets on the either side of the offending hole and rivet it all together with the skin. I'm not a big fan of using JB Weld on an airplane, except perhaps in very rare circumstances on non-structural items, but that's just my opinion.
Steve M.
Ellensburg WA
RV-9 Flying, 0-320, Catto

Donation reminder: Jan. 2022
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