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01-06-2013, 10:35 AM
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Join Date: Dec 2012
Location: N.C.
Posts: 144
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oblong holes
Don't think I'd use cherrymax rivets on a spar...imho...having been an a&p for 34 years i've seen these fastners loosen over time. We used them only as temporary repairs until permanent repairs could be made. Blind installations required cherrymax rivets or huck bolts . If I were building spars in your situation I'd use a piloted reamer to clear up the holes,especially on a spar. Start with a 1st over and see where you end up. If the new part is cheap just replace it and match ream,not drill the holes.
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01-07-2013, 11:34 AM
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Join Date: Oct 2012
Location: Prince George, BC
Posts: 61
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Quote:
Originally Posted by Andrew M
I personally aviod cherrys. Here is the P.N for oversize solid, think the other "oops" rivet, NAS1242AD universal head and NAS1241AD countersunk.
http://www.gen-aircraft-hardware.com...s_Oversize.pdf
It's hard to see without a rivet in the hole, but I might be inclined to see if a standard rivet, maybe a half size longer, would go. Just get it to fill up the hole once it's set.
Cherrys are "riskier" to remove if you have problems, and most any DER will tell you to avoid mixing up the type of fasteners in a line because how they flex (or not) differently.
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Quote:
Originally Posted by Walt
Agree with Andrew, fill the ones that are in limits with -4's, step up the rest to either the OS rivet or -5's.
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Guys,
Do you have a suggestion on where to source the NAS1242AD4 rivets? I can't find them on the Van's site or at Aircraft Spruce.
Thanks.
__________________
Graham
RV-7
Empennage [in progress]
Wings [inventoried]
The plan(?): Tip-up | AeroSport IO-375 | WW 200RV | Vertical Power VP-X | Garmin G3X
VAF dues paid - Dec. 2013
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01-07-2013, 12:53 PM
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Join Date: Aug 2005
Location: Dallas/Ft Worth, TX
Posts: 5,686
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__________________
Walt Aronow, DFW, TX (52F)
EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
Dynamic Prop Balancing, Pitot-Static Altmeter/Transponder Certification
FAA Certified Repair Station, AP/IA/FCC GROL, EAA Technical Counselor
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RV7A built 2004, 1700+ hrs, New Titan IO-370, Bendix Mags
Website: ExpAircraft.com, Email: walt@expaircraft.com, Cell: 972-746-5154
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01-09-2013, 08:53 AM
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Join Date: Feb 2006
Location: Trenton, SC
Posts: 117
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oblong holes
Just for my 2 cents, I don't know how you used your reamer, but I have found that you get better results when pulling the reamer through the hole rather than trying to force it through like a drill bit.
Ed Booth
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01-10-2013, 07:52 PM
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Join Date: Oct 2012
Location: Prince George, BC
Posts: 61
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Update...
Thanks everyone for your input and suggestions thus far.
I spoke with Van's... They aren't very keen on me using NAS1242AD rivets as a fix based on the number of NAS rivets that would be required, and the corresponding number of under-sized heads.
They are suggesting either stepping up to AD5 rivets or replacing the parts. At this point I'm leaning towards at least giving it a go with the AD5 rivets, and seeing how things work out. I'd probably end up re-drilling and using AD5s in most of the 603pp to 609pp attach holes. If it all goes sideways, I can always order the new parts.
Of course, I'll need to buy a 5/32" cup set as I don't already have one. I'm thinking a 5/32" cup set and the 12" back-riveting set from Cleaveland would let me set these rivets using my 3x rivet gun and c-frame with hopefully excellent results. Anybody have experience with using this setup to shoot AD5 rivets?
__________________
Graham
RV-7
Empennage [in progress]
Wings [inventoried]
The plan(?): Tip-up | AeroSport IO-375 | WW 200RV | Vertical Power VP-X | Garmin G3X
VAF dues paid - Dec. 2013
Last edited by Golf Echo : 01-10-2013 at 08:18 PM.
Reason: 5/32" NOT 5/16" -- Fractions are hard ;)
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01-10-2013, 08:15 PM
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Join Date: Mar 2005
Location: Dallas area
Posts: 10,768
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Quote:
Originally Posted by Golf Echo
Of course, I'll need to buy a 5/16" cup set as I don't already have one. I'm thinking a 5/16" cup set and the 12" back-riveting set from Cleaveland would let me set these rivets using my 3x rivet gun and c-frame with hopefully excellent results. Anybody have experience with using this setup to shoot AD5 rivets?
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I think/hope you mean 5/32". No reason to get too carried away.
__________________
Mel Asberry, DAR since the last century.
EAA Flight Advisor/Tech Counselor, Friend of the RV-1
Recipient of Tony Bingelis Award and Wright Brothers Master Pilot Award
USAF Vet, High School E-LSA Project Mentor.
RV-6 Flying since 1993 (sold)
<rvmel(at)icloud.com>
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01-10-2013, 08:17 PM
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Join Date: Oct 2012
Location: Prince George, BC
Posts: 61
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Quote:
Originally Posted by Mel
I think/hope you mean 5/32". No reason to get too carried away.
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Whoops! 
Definitely meant 5/32".
__________________
Graham
RV-7
Empennage [in progress]
Wings [inventoried]
The plan(?): Tip-up | AeroSport IO-375 | WW 200RV | Vertical Power VP-X | Garmin G3X
VAF dues paid - Dec. 2013
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