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Tailcone crack found per SB 08-6-1

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dave.saylor.aircrafters(a
Guest

Posted: Wed Feb 16, 2011 11:13 am Post subject: Tailcone crack found per SB 08-6-1

I found a crack in my tailcone as described by the SB during this year's annual.



I've got 775 hours on the Hobbs.  It's been flying for 3 1/2 years.

I've only done stalls a couple times, i.e., Phase 1 and BFRs.

However, the first time I landed with a significantly aft CG it wasn't

pretty.  I banged the tail tie-down hard enough to bend the "open

loop" eye bolt and grind half an inch off the rudder cap.  That was in

 December 2008.  I think that event may have led to the crack.



I've been checking it visually at every annual and whenever I have the

panels off at the elevator bellcrank.



At some point during the previous inspections I saw what looked like a

minor wave in the bulkhead and a fine line where there is now

definitely a crack.  When I first saw it, I crawled into the tailcone

and was able to feel the area with my fingernail.  After first

noticing the "fine line", I watched it very closely at every

inspection.  I never noted any change over the next two inspections.

This year it looked more pronounced so I looked even closer.  I've

been working as an IA for 20+ years and I've seen a lot of cracks.

Even with my hand on it and solid boroscope inspections, I could not

convince myself that the mark was a crack.  We finally confirmed it by

shining a bright light from the front of the bulkhead and looking in

from behind with a boroscope.  After disassembly I centerpunched the

outboard rivet at the top of the bulkhead and the crack really jumped

out.  Before that, even with the top plate removed and having complete

access to the bulkhead, it was hard to definitively call it a crack.



The repair is pretty straight-forward.  The only comment I would make

is to completely remove F-1010A in Step 9.  It's only three more rivet

heads and it makes working in the area a lot easier since you can

drive the tails out of F-1010A on the bench instead of with it

attached to the bulkhead.



In the future I plan to treat any warping or marks on the bulkhead as

reasons to add the doublers.  The damage seems to have happened

slowly, not suddenly, so the 25 hour inspections seem adequate to

catch the problem.  You can see the area through the elevator

bellcrank covers with a bright light, so the inspection shouldn't add

more than few minutes to a preflight.



Last week we inspected another -10 for a customer and there were

definitely no cracks, lines, warping, etc.  It just looked completely

different.



I'll post another picture with the doublers installed and the total

time to complete the repair.



Fly safe,



Dave Saylor

AirCrafters

140 Aviation Way

Watsonville, CA 95076

831-722-9141 Shop

831-750-0284 Cell

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pilotdds(at)aol.com
Guest

Posted: Wed Feb 16, 2011 11:48 am Post subject: Tailcone crack found per SB 08-6-1

Dave,thanks for a well documented and useful post,my understanding is you did not do the service bulletin,If that is the case I have an extra set of the doublers I will send you-Jim

 

   

 

 

   --

pietflyr(at)bellsouth.net
Guest

Posted: Wed Feb 16, 2011 11:57 am Post subject: Tailcone crack found per SB 08-6-1

Excellent, Dave!  I'm sure I speak for everyone on this in thanking you for

your detailed presentation of this problem.



Jack Phillips

#40610 - building ailerons today

Raleigh, NC



--

jcumins(at)jcis.net
Guest

Posted: Wed Feb 16, 2011 12:56 pm Post subject: Tailcone crack found per SB 08-6-1

Dave



I to have a extra set of doublers if you need them.  Just shoot me a e-mail and I will get them in the mail to you



Wings rear spar scuffing and primering once the rain stops



John G. Cumins

President

 



2499 B1 Martin Rd

Fairfield Ca 94534

707-425-7100

707-425-7576 Fax

 

Your Total Technology Solution Provider



--

dave.saylor.aircrafters(a
Guest

Posted: Wed Feb 16, 2011 1:07 pm Post subject: Tailcone crack found per SB 08-6-1

Thanks guys, I have the set that went out with the SB.



Dave Saylor

AirCrafters

140 Aviation Way

Watsonville, CA 95076

831-722-9141 Shop

831-750-0284 Cell



On Wed, Feb 16, 2011 at 12:42 PM, John Cumins <jcumins(at)jcis.net> wrote:

[quote] 



 Dave



 I to have a extra set of doublers if you need them.  Just shoot me a e-mail and I will get them in the mail to you



 Wings rear spar scuffing and primering once the rain stops



 John G. Cumins

 President

 2499 B1 Martin Rd

 Fairfield Ca 94534

 707-425-7100

 707-425-7576 Fax



 Your Total Technology Solution Provider



 --

Tim Olson

Joined: 25 Jan 2007
Posts: 2872

Posted: Wed Feb 16, 2011 1:09 pm Post subject: Tailcone crack found per SB 08-6-1

Well, I guess that proves that the S.B. was a valid one

and should be done.  I know lots of people were

doubtful, but now that there is another case it's clear

that it's a good idea to do. It was a 1 day job to do

the whole thing, so in the big scheme of things it

wasn't too bad.

Tim



On 2/16/2011 12:19 PM, Dave Saylor wrote:

 	  Quote: 	
		   I found a crack in my tailcone as described by the SB during this year's annual.



 I've got 775 hours on the Hobbs.  It's been flying for 3 1/2 years.

 I've only done stalls a couple times, i.e., Phase 1 and BFRs.

 However, the first time I landed with a significantly aft CG it wasn't

 pretty.  I banged the tail tie-down hard enough to bend the "open

 loop" eye bolt and grind half an inch off the rudder cap.  That was in

   December 2008.  I think that event may have led to the crack.



 I've been checking it visually at every annual and whenever I have the

 panels off at the elevator bellcrank.



 At some point during the previous inspections I saw what looked like a

 minor wave in the bulkhead and a fine line where there is now

 definitely a crack.  When I first saw it, I crawled into the tailcone

 and was able to feel the area with my fingernail.  After first

 noticing the "fine line", I watched it very closely at every

 inspection.  I never noted any change over the next two inspections.

 This year it looked more pronounced so I looked even closer.  I've

 been working as an IA for 20+ years and I've seen a lot of cracks.

 Even with my hand on it and solid boroscope inspections, I could not

 convince myself that the mark was a crack.  We finally confirmed it by

 shining a bright light from the front of the bulkhead and looking in

 from behind with a boroscope.  After disassembly I centerpunched the

 outboard rivet at the top of the bulkhead and the crack really jumped

 out.  Before that, even with the top plate removed and having complete

 access to the bulkhead, it was hard to definitively call it a crack.



 The repair is pretty straight-forward.  The only comment I would make

 is to completely remove F-1010A in Step 9.  It's only three more rivet

 heads and it makes working in the area a lot easier since you can

 drive the tails out of F-1010A on the bench instead of with it

 attached to the bulkhead.



 In the future I plan to treat any warping or marks on the bulkhead as

 reasons to add the doublers.  The damage seems to have happened

 slowly, not suddenly, so the 25 hour inspections seem adequate to

 catch the problem.  You can see the area through the elevator

 bellcrank covers with a bright light, so the inspection shouldn't add

 more than few minutes to a preflight.



 Last week we inspected another -10 for a customer and there were

 definitely no cracks, lines, warping, etc.  It just looked completely

 different.



 I'll post another picture with the doublers installed and the total

 time to complete the repair.



 Fly safe,



 Dave Saylor

 AirCrafters

 140 Aviation Way

 Watsonville, CA 95076

 831-722-9141 Shop

 831-750-0284 Cell

dlm34077(at)q.com
Guest

Posted: Wed Feb 16, 2011 1:14 pm Post subject: Tailcone crack found per SB 08-6-1

Has anyone found cracks without a tail strike or heavy turbulence?  At this 

point we seem to have two instances of crack. Are there others?

---

jcumins(at)jcis.net
Guest

Posted: Wed Feb 16, 2011 1:17 pm Post subject: Tailcone crack found per SB 08-6-1

Dave



Not a problem.



Have fun.  Saratoga annual starts tonight so no RV building for a while.



John G. Cumins

President

 



2499 B1 Martin Rd

Fairfield Ca 94534

707-425-7100

707-425-7576 Fax

 

Your Total Technology Solution Provider

--

jesse(at)saintaviation.co
Guest

Posted: Wed Feb 16, 2011 2:29 pm Post subject: Tailcone crack found per SB 08-6-1

No crack in N256H after 934 hrs.  No major tail strike, but the SB is still on the To-Do list.



do not archive



Jesse Saint

Saint Aviation, Inc.

jesse(at)saintaviation.com

C: 352-427-0285

F: 815-377-3694



On Feb 16, 2011, at 4:11 PM, DLM wrote:



[quote] 

 

 Has anyone found cracks without a tail strike or heavy turbulence?  At this point we seem to have two instances of crack. Are there others?

 ---

amekler

Joined: 07 Oct 2010
Posts: 164

Posted: Wed Feb 16, 2011 3:10 pm Post subject: Tailcone crack found per SB 08-6-1

I purchased my RV-10 a year ago. It was built in 2008-2009. The builder is no longer alive. How can I

tell if the sb was complied with? What should I be looking for.

Nothing in the logs that I can find.

Alan

N668g



Sent from my iPhone



On Feb 16, 2011, at 11:19 AM, Dave Saylor <dave.saylor.aircrafters(at)gmail.com> wrote:



 	  Quote: 	
		   I found a crack in my tailcone as described by the SB during this year's annual.

 

 I've got 775 hours on the Hobbs.  It's been flying for 3 1/2 years.

 I've only done stalls a couple times, i.e., Phase 1 and BFRs.

 However, the first time I landed with a significantly aft CG it wasn't

 pretty.  I banged the tail tie-down hard enough to bend the "open

 loop" eye bolt and grind half an inch off the rudder cap.  That was in

 December 2008.  I think that event may have led to the crack.

 

 I've been checking it visually at every annual and whenever I have the

 panels off at the elevator bellcrank.

 

 At some point during the previous inspections I saw what looked like a

 minor wave in the bulkhead and a fine line where there is now

 definitely a crack.  When I first saw it, I crawled into the tailcone

 and was able to feel the area with my fingernail.  After first

 noticing the "fine line", I watched it very closely at every

 inspection.  I never noted any change over the next two inspections.

 This year it looked more pronounced so I looked even closer.  I've

 been working as an IA for 20+ years and I've seen a lot of cracks.

 Even with my hand on it and solid boroscope inspections, I could not

 convince myself that the mark was a crack.  We finally confirmed it by

 shining a bright light from the front of the bulkhead and looking in

 from behind with a boroscope.  After disassembly I centerpunched the

 outboard rivet at the top of the bulkhead and the crack really jumped

 out.  Before that, even with the top plate removed and having complete

 access to the bulkhead, it was hard to definitively call it a crack.

 

 The repair is pretty straight-forward.  The only comment I would make

 is to completely remove F-1010A in Step 9.  It's only three more rivet

 heads and it makes working in the area a lot easier since you can

 drive the tails out of F-1010A on the bench instead of with it

 attached to the bulkhead.

 

 In the future I plan to treat any warping or marks on the bulkhead as

 reasons to add the doublers.  The damage seems to have happened

 slowly, not suddenly, so the 25 hour inspections seem adequate to

 catch the problem.  You can see the area through the elevator

 bellcrank covers with a bright light, so the inspection shouldn't add

 more than few minutes to a preflight.

 

 Last week we inspected another -10 for a customer and there were

 definitely no cracks, lines, warping, etc.  It just looked completely

 different.

 

 I'll post another picture with the doublers installed and the total

 time to complete the repair.

 

 Fly safe,

 

 Dave Saylor

 AirCrafters

 140 Aviation Way

 Watsonville, CA 95076

 831-722-9141 Shop

 831-750-0284 Cell

 <4 Crack after centerpunching rivet for drilling.jpg>

 <1 Bright backlight viewed with boroscope--with frontlight.jpg>

 <2 Bright backlight viewed with boroscope--no frontlight.jpg>

 <3 Ready for repair.jpg>

 <5 F-1010A removed to punch out rivet tails.jpg>

 <6 Stop drilled--note crack ends above F-1010A, not visible from fwd side.jpg>

N520TX

Joined: 13 Oct 2008
Posts: 9

Posted: Wed Feb 16, 2011 3:46 pm Post subject: Tailcone crack found per SB 08-6-1

On Wed, 2011-02-16 at 16:07 -0700, Alan Mekler MD wrote:

 	  Quote: 	
		   How can I

 tell if the sb was complied with? What should I be looking for. 


	


Have a look at http://www.vansaircraft.com/pdf/sb08-6-1.pdf. That is the

specific bulletin - it details the change and how to spot it.



FYI - for any service bulletins related to vans aircraft, you can find

them here -> http://www.vansaircraft.com/public/notices.htm.



-ron

pilotdds(at)aol.com
Guest

Posted: Wed Feb 16, 2011 6:01 pm Post subject: Tailcone crack found per SB 08-6-1

There should be a logbook endorsement,if not your mechanic can inspect it from the pictures and instructions on Vans website.The inspection is easy the fix is somewhat more involved,it took me a couple weekends but I work slow-Jim

 

   

 

 

   --

tsts4

Joined: 06 Aug 2007
Posts: 167
Location: Tampa, FL

Posted: Thu Feb 17, 2011 4:29 am Post subject: Re: Tailcone crack found per SB 08-6-1

 	  Quote: 	
		  There should be a logbook endorsement,.... 	




Only if it was installed after receiving his airworthiness certificate.  Since it was built in 2008, like with my project, it could have been installed during the build so there wouldn't be a logbook entry in that case.

_________________
Todd Stovall
aka "Auburntsts" on EAA and VAF
RV-10 N728TT -- Flying

Last edited by tsts4 on Thu Feb 17, 2011 6:35 am; edited 1 time in total

Kellym

Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ

Posted: Thu Feb 17, 2011 4:45 am Post subject: Tailcone crack found per SB 08-6-1

Probably a good suggestion to all of us that are not yet 

completed....put mention of SBs complied with in the initial logbook 

entry, as a point of reference for any subsequent owner, or heaven 

forbid, any accident investigation. Much as I dislike it, whether for 

certified or homebuilt, logbooks are there to protect our backsides, and 

to make our lives easier when we need to verify something that our 

brains have blotted out.

On 2/17/2011 5:29 AM, tsts4 wrote:

 	  Quote: 	
		   

> There should be a logbook endorsement,....



 Only if was installed after receiving his airworthiness certificate.  Since it was built in 2008, like with my project, it could have been installed during the build so there wouldn't be a logbook entry in that case.



 --------

 Todd Stovall

 728TT (reserved)

 RV-10 Empacone, Wings, Fuse





 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p=331323#331323

_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
KCHD

scottmschmidt(at)yahoo.co
Guest

Posted: Tue Feb 22, 2011 12:49 pm Post subject: Tailcone crack found per SB 08-6-1

What I learned from this is you can strike the tail on landing. I did not think you could. 

I have landed with very high nose attitude before practicing short field approaches, but probably not with an aft CG. 

Great post, thanks. 

-Scott

Sent from my iPad

On Feb 16, 2011, at 4:19 PM, Ron Walker <n520tx(at)earthlink.net> wrote:

 	  Quote: 	

 On Wed, 2011-02-16 at 16:07 -0700, Alan Mekler MD wrote:

> How can I

> tell if the sb was complied with? What should I be looking for. 

 Have a look at http://www.vansaircraft.com/pdf/sb08-6-1.pdf. That is the

 specific bulletin - it details the change and how to spot it.

 FYI - for any service bulletins related to vans aircraft, you can find

 them here -> http://www.vansaircraft.com/public/notices.htm.

 -ron

Tim Olson

Joined: 25 Jan 2007
Posts: 2872

Posted: Tue Feb 22, 2011 6:29 pm Post subject: Tailcone crack found per SB 08-6-1

I've never struck the tail in any way, but, I can tell you that

if you haul a family with tons of baggage and are about as far

aft as the CG range allows, you have to be very careful in

the flare because there is a ton of elevator authority and it's

easy to pull too much.  Same on rotation.  It's one of the

reasons I value having a little heavier nose...I think the RV-10

is designed plenty far aft and I don't think it would be as

nice to fly if you are pushing past that aft CG point.



Tim Olson - RV-10 N104CD

do not archive

On 2/22/2011 2:46 PM, Scott Schmidt wrote:

 	  Quote: 	
		   



 What I learned from this is you can strike the tail on landing. I did not think you could.

 I have landed with very high nose attitude before practicing short field approaches, but probably not with an aft CG.

 Great post, thanks.

 -Scott



 Sent from my iPad



 On Feb 16, 2011, at 4:19 PM, Ron Walker<n520tx(at)earthlink.net>  wrote:



> 

>

> On Wed, 2011-02-16 at 16:07 -0700, Alan Mekler MD wrote:

>> How can I

>> tell if the sb was complied with? What should I be looking for.

>

> Have a look at http://www.vansaircraft.com/pdf/sb08-6-1.pdf. That is the

> specific bulletin - it details the change and how to spot it.

>

> FYI - for any service bulletins related to vans aircraft, you can find

> them here ->  http://www.vansaircraft.com/public/notices.htm.

>

> -ron

>

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