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dave.saylor.aircrafters(a
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 Posted: Wed Feb 16, 2011 11:13 am Post subject: Tailcone crack found per SB 08-6-1 |
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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
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| Posted: Wed Feb 16, 2011 11:48 am Post subject: Tailcone crack found per SB 08-6-1 |
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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
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pietflyr(at)bellsouth.net
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| Posted: Wed Feb 16, 2011 11:57 am Post subject: Tailcone crack found per SB 08-6-1 |
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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
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jcumins(at)jcis.net
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| Posted: Wed Feb 16, 2011 12:56 pm Post subject: Tailcone crack found per SB 08-6-1 |
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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
--
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dave.saylor.aircrafters(a
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| Posted: Wed Feb 16, 2011 1:07 pm Post subject: Tailcone crack found per SB 08-6-1 |
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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
--
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Tim Olson
Joined: 25 Jan 2007
Posts: 2872
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| Posted: Wed Feb 16, 2011 1:09 pm Post subject: Tailcone crack found per SB 08-6-1 |
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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
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dlm34077(at)q.com
Guest
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| Posted: Wed Feb 16, 2011 1:14 pm Post subject: Tailcone crack found per SB 08-6-1 |
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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?
---
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jcumins(at)jcis.net
Guest
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| Posted: Wed Feb 16, 2011 1:17 pm Post subject: Tailcone crack found per SB 08-6-1 |
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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
--
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jesse(at)saintaviation.co
Guest
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| Posted: Wed Feb 16, 2011 2:29 pm Post subject: Tailcone crack found per SB 08-6-1 |
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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?
---
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amekler
Joined: 07 Oct 2010
Posts: 164
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| Posted: Wed Feb 16, 2011 3:10 pm Post subject: Tailcone crack found per SB 08-6-1 |
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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>
|
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N520TX
Joined: 13 Oct 2008
Posts: 9
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| Posted: Wed Feb 16, 2011 3:46 pm Post subject: Tailcone crack found per SB 08-6-1 |
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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
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pilotdds(at)aol.com
Guest
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| Posted: Wed Feb 16, 2011 6:01 pm Post subject: Tailcone crack found per SB 08-6-1 |
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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
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tsts4
Joined: 06 Aug 2007
Posts: 167
Location: Tampa, FL
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| Posted: Thu Feb 17, 2011 4:29 am Post subject: Re: Tailcone crack found per SB 08-6-1 |
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| 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.
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_________________
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 |
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Kellym
Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ
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| Posted: Thu Feb 17, 2011 4:45 am Post subject: Tailcone crack found per SB 08-6-1 |
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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
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Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
KCHD |
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scottmschmidt(at)yahoo.co
Guest
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| Posted: Tue Feb 22, 2011 12:49 pm Post subject: Tailcone crack found per SB 08-6-1 |
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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:
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Tim Olson
Joined: 25 Jan 2007
Posts: 2872
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| Posted: Tue Feb 22, 2011 6:29 pm Post subject: Tailcone crack found per SB 08-6-1 |
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|
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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