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  #551  
Old 02-18-2014, 06:04 PM
jim plaster jim plaster is offline
 
Join Date: Dec 2012
Location: N.C.
Posts: 144
Default Service bullitens

Just inspected two Aircraft today.....rv6a,685 hours ttaf,io360 200 hp ,hartzell c/s prop. Kit completed in 2001, does have relief radius.....no cracks....airplane #2... Rv8..100 hours ttaf,o320 160 hp, sensenich f/p prop....kit completed 2002..has relief radius...no cracks. Also inspected elevator spars for cracks in hinge areas.....none found on either aircraft.....mild aerobatics of less than 3.5 g on both ships
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  #552  
Old 02-18-2014, 07:52 PM
estoro estoro is offline
 
Join Date: May 2005
Posts: 10
Default HOW TO FIX ???

Okay everyone, we got the message on the crack-relief-flying off carriers etc.
Now what is really needed is more info on how to do the fix. Bret, Mark, 2000, have all been very helpful. But please ---more photos with explanations.
Bret, did you drill out/off the skin at the rear spar?? Mark, how did you buck the fish mouth area rivets?? Difficult? easy?? How much time? Right hand-left hand-blind rivets???

If you plan on selling your airplane, how will you answer the "Stab Spar Mod" question. (no mod? subtract $2000).

Thanks

Ed (waiting on parts)

Last edited by estoro : 02-18-2014 at 07:53 PM. Reason: forgot one word
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  #553  
Old 02-18-2014, 08:56 PM
Norman CYYJ Norman CYYJ is online now
 
Join Date: Feb 2005
Location: Victoria B.C.
Posts: 1,266
Default

Another area that should be checked while doing the SB is to look at the rudder for the same cracks that might appear on the elevator. The rudder is also supported as the elevator is and loose jam nuts could cause cracks at the rivets that fasten the nut plates.
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  #554  
Old 02-18-2014, 09:35 PM
Frank Smidler Frank Smidler is offline
 
Join Date: Feb 2005
Location: Stoughton, WI
Posts: 473
Default

Finally made it through the snow to the hanger. Inspection made with paint in place, no indication of anything to worry about. Will strip paint when temps warm up enough and inspect more closely. Don't believe pushing on tail to move would cause a stress crack that requires high cycles (not nearly enough cycles).

RV-6
O-360, 180HP
Wood Sterba
First flew 2009
550 Hrs TT
Minimal acro
50% grass
ALWAYS push plane into hanger with horizontal Stab
No cracks, minimum notch
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N96FS, RV-6
Flying 1/11/09
1085 hr
2WI6 Stoughton, WI
Formally of Lafayette, IN
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  #555  
Old 02-18-2014, 10:15 PM
Mark Burns's Avatar
Mark Burns Mark Burns is offline
 
Join Date: Jan 2005
Location: Ruston, Louisiana
Posts: 879
Default OK

Quote:
Originally Posted by estoro View Post
Okay everyone, we got the message on the crack-relief-flying off carriers etc.
Now what is really needed is more info on how to do the fix. Bret, Mark, 2000, have all been very helpful. But please ---more photos with explanations.
Bret, did you drill out/off the skin at the rear spar?? Mark, how did you buck the fish mouth area rivets?? Difficult? easy?? How much time? Right hand-left hand-blind rivets???

If you plan on selling your airplane, how will you answer the "Stab Spar Mod" question. (no mod? subtract $2000).

Thanks

Ed (waiting on parts)

Ed,
I think we've all been too busy installing the kit!

The hardest part is drilling/punching out those rivets on the ends of the angles.
I used an angle drill.

The riveting turned out to be a "non-issue" for me.
Up in the tight spots I used a 3X gun with a short (3") offset rivet set.
Take the spring off the gun, there's no room for it.
Turn the rivet set for each rivet to line it up with the gun in an optimum position to hold well. Tape the rivet set to the gun with electrical tape to keep it from rotating while riveting.

Nearly every rivet requires a repositioning of the set and tape it again.
I ran the air pressure on 60 but I'm sure some 3X guns are different.

It is quite a project. More than the few evenings I had estimated. I just reinstalled the empennage back on my 7A tonight.
I plan to fly tomorrow, it's been a long time!

As to how will I answer the "Stab Spar Mod" question. I will simply tell the truth. That I had two cracks and complied with the SB by installing the Vans kit.

Good luck with yours. Just take it slow and easy on the ones that are hard to get to.

Mark





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Mark Burns
Ruston, Louisiana
RV-7A N781CM 1,650+ hrs
FFI FL-24
A&P

Last edited by Mark Burns : 02-18-2014 at 10:23 PM.
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  #556  
Old 02-19-2014, 06:36 AM
jim plaster jim plaster is offline
 
Join Date: Dec 2012
Location: N.C.
Posts: 144
Default Crack mod

Looks like Mark has the best idea by removing the root ribs for access. This would give more access to drill and shoot the rivets thru the spar web. Not to mention minimizing damage should the rivet set jump off and trash the spar web. I'd plan for a week of down time to do the mod based on 34 years of sheet metal experience.
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  #557  
Old 02-19-2014, 07:12 AM
uk_figs's Avatar
uk_figs uk_figs is offline
 
Join Date: Jan 2005
Location: Tulsa, OK
Posts: 1,015
Default No cracks

RV-7
O-360, 180HP
Catto 3 blade
First flew Oct 2008
300 Hrs TT
Occasional acro
50% grass
Push plane with horizontal Stab
No cracks, notched
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Dave's RV-7 Blog
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  #558  
Old 02-19-2014, 07:13 AM
Mark Burns's Avatar
Mark Burns Mark Burns is offline
 
Join Date: Jan 2005
Location: Ruston, Louisiana
Posts: 879
Default

Quote:
Originally Posted by jim plaster View Post
Looks like Mark has the best idea by removing the root ribs for access. This would give more access to drill and shoot the rivets thru the spar web. Not to mention minimizing damage should the rivet set jump off and trash the spar web. I'd plan for a week of down time to do the mod based on 34 years of sheet metal experience.
Hi Jim,
Removing the ribs is not "my idea".
It's called out in the Service Bulletin.
And it would be impossible to do without removing the ribs.

Just didn't want to take credit for the idea.
Good luck with yours.

Mark
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Mark Burns
Ruston, Louisiana
RV-7A N781CM 1,650+ hrs
FFI FL-24
A&P
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  #559  
Old 02-19-2014, 07:52 AM
jim plaster jim plaster is offline
 
Join Date: Dec 2012
Location: N.C.
Posts: 144
Default Cracks

Looks like the best option ....I've heard there's possibly a new rib in the works to allow for the doubler thickness without cutting the leg off? Sure would make it a cleaner mod. Any interest for non- builders on having this mod done for you?
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  #560  
Old 02-19-2014, 07:59 AM
flytoboat's Avatar
flytoboat flytoboat is offline
 
Join Date: Dec 2006
Location: Collinsville, IL
Posts: 620
Default No cracks

RV6A
0-320/Sensenich F/P
Finished 2001
260 hours
No aerobatics (yet)
No unpaved runways (yet)
No relief notches
No cracks on HS or elevator
No action until next condition inspection
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VAF #1100, EAA864
-6A bought flying
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