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tdawson-townsend(at)auror
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 Posted: Tue Jun 10, 2008 12:16 am Post subject: Service Bulletin |
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Not the package I was hoping for from Van’s when I got home today! (SB package on my doorstep)
TDT
Tim Dawson-Townsend
40025
tdt(at)aurora.aero (tdt(at)aurora.aero)
617-500-4812 (office)
617-905-4800 (mobile)
[quote][b]
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Deems Davis
Joined: 09 Jan 2006
Posts: 925
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| Posted: Tue Jun 10, 2008 1:07 am Post subject: Service Bulletin |
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So, ....... we've got a 'fix . . .' (a.k.a. SB) but it leaves me
wondering about what caused the cracks in the 1st place? What is going
on that would / is causing a crack/s to appear in that bulkhead at those
location? (Root Cause) I'm not an engineer, but most cases of cracks
that I've heard of are the result of fatigue due to stress, or
vibration, or ........? I recall a past thread that spoke about
someone who had witnessed the regular 'twisting' of the horizontal stab.
IIRC the suspected cause of the twist was the 'unsynchronized' movement
of the trim tabs. Could this be contributing to this situation???? I'd
like to hear from the engineers out there.
Deems Davis # 406
'Its all done....Its just not put together'
http://deemsrv10.com/
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rene(at)felker.com
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| Posted: Tue Jun 10, 2008 4:35 am Post subject: Service Bulletin |
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No science involved but......when the airplane stalls there is a fair amount
of tail buffet......vibration......maybe the demonstrator A/C will be the
only one that develops these cracks due to the type of flying it does??????
It will be interesting to see if anyone else finds the cracks. I plan on
doing my inspection today, will let the list know what I find, if anything.
Let's see, I have a new plane that has two mandatory (in my mind) inspection
requirements, one for the fuel servo and one for the tail. And I had to
disassemble the Vertical Stabilizer already to deal with another SB. I am
with Scott, it seems like I will spend as much time working on the plane as
I will flying it.......but of course that is not really true in that I have
34 hours on the airframe and may have spent 4 hours working on it
(inspections, oil, rigging).
I have yet to really finish the airplane and am finding it hard to do it. I
am still working on the wheel fairings, at the painter finally, and have a
fair amount of interior work to finish up. It is just that when I have free
time and the weather is nice.....I fly.
Rene' Felker
RV-10 N423CF Flying
801-721-6080
--
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rdoerr(at)kc.rr.com
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| Posted: Tue Jun 10, 2008 7:24 am Post subject: Service Bulletin |
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I would really like to see pictures of what Van's found when the decided to issue these types of service bulletins. It would benefit us all on what exactly we should be looking for and where and how severe it was.
Ray Doerr
I just finished putting the tail back together a few week ago after paint. It never ends.
N519RV (40250) 376 hours.
---- Rene Felker <rene(at)felker.com> wrote:
[quote]
No science involved but......when the airplane stalls there is a fair amount
of tail buffet......vibration......maybe the demonstrator A/C will be the
only one that develops these cracks due to the type of flying it does??????
It will be interesting to see if anyone else finds the cracks. I plan on
doing my inspection today, will let the list know what I find, if anything.
Let's see, I have a new plane that has two mandatory (in my mind) inspection
requirements, one for the fuel servo and one for the tail. And I had to
disassemble the Vertical Stabilizer already to deal with another SB. I am
with Scott, it seems like I will spend as much time working on the plane as
I will flying it.......but of course that is not really true in that I have
34 hours on the airframe and may have spent 4 hours working on it
(inspections, oil, rigging).
I have yet to really finish the airplane and am finding it hard to do it. I
am still working on the wheel fairings, at the painter finally, and have a
fair amount of interior work to finish up. It is just that when I have free
time and the weather is nice.....I fly.
Rene' Felker
RV-10 N423CF Flying
801-721-6080
--
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Tim Olson
Joined: 25 Jan 2007
Posts: 2881
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| Posted: Tue Jun 10, 2008 7:39 am Post subject: Service Bulletin |
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AMEN! I think issuing it without photo illustrations is
a bit ridiculous. It would be nice if we could all see
exactly what we need to watch for.
Tim Olson - RV-10 N104CD - Flying
do not archive
rdoerr(at)kc.rr.com wrote:
| Quote: |
I would really like to see pictures of what Van's found when the
decided to issue these types of service bulletins. It would benefit
us all on what exactly we should be looking for and where and how
severe it was.
Ray Doerr I just finished putting the tail back together a few week
ago after paint. It never ends.
|
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pascal(at)rv10builder.net
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| Posted: Tue Jun 10, 2008 7:58 am Post subject: Service Bulletin |
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When I call Van's for questions I am usually told that its fine to have
some issues I feel may be a structural concern (aka replacing rivets with a
pop rivet, etc). The way I see SB's from Van's are that it's something
serious enough that they want it resolved. They admit there is something
that IS a structural shortfall/concern and should be improved/replaced.
Many have complained of shortfalls on some parts from Van's , but Van's has
not always sent out an SB on it (WD-415 was improved to resolve a shortfall
but not replaced with parts in the mail, there is the landing gear shimmy,
etc)
My point is regardless of how bad the crack is.. Van's is sending parts out
for everyone to replace as needed. As the builder it's up to us to determine
if we want that extra layer of protection, even if the crack never occurs,
I'm with do the work now versus stressing about it later- Like insurance I
sure hope it's never an issue but I'm glad I did all I could to protect
myself if it ever does. Nothing wrong with making it stronger.
Deems has a great point about.. why? maybe understanding the trim issue or
other as to why this SB is needed might resolve other issues in the future.
John Cox, maybe you can get the "rest of the story" for us.
Pascal
--------------------------------------------------
From: <rdoerr(at)kc.rr.com>
Sent: Tuesday, June 10, 2008 8:21 AM
To: <rv10-list(at)matronics.com>
Subject: RE: Service Bulletin
[quote]
I would really like to see pictures of what Van's found when the decided
to issue these types of service bulletins. It would benefit us all on
what exactly we should be looking for and where and how severe it was.
Ray Doerr
I just finished putting the tail back together a few week ago after paint.
It never ends.
N519RV (40250) 376 hours.
---- Rene Felker <rene(at)felker.com> wrote:
>
> No science involved but......when the airplane stalls there is a fair
> amount
> of tail buffet......vibration......maybe the demonstrator A/C will be the
> only one that develops these cracks due to the type of flying it
> does??????
> It will be interesting to see if anyone else finds the cracks. I plan on
> doing my inspection today, will let the list know what I find, if
> anything.
>
> Let's see, I have a new plane that has two mandatory (in my mind)
> inspection
> requirements, one for the fuel servo and one for the tail. And I had to
> disassemble the Vertical Stabilizer already to deal with another SB. I
> am
> with Scott, it seems like I will spend as much time working on the plane
> as
> I will flying it.......but of course that is not really true in that I
> have
> 34 hours on the airframe and may have spent 4 hours working on it
> (inspections, oil, rigging).
>
> I have yet to really finish the airplane and am finding it hard to do it.
> I
> am still working on the wheel fairings, at the painter finally, and have
> a
> fair amount of interior work to finish up. It is just that when I have
> free
> time and the weather is nice.....I fly.
>
> Rene' Felker
> RV-10 N423CF Flying
> 801-721-6080
> --
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dlm46007(at)cox.net
Guest
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| Posted: Tue Jun 10, 2008 10:22 am Post subject: Service Bulletin |
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Just talked with my buddy at the BAC and we looked at the digital pictures I
took of the area this morning. The problem area as determined by Vans is the
tab that is riveted to the side of the longeron. He noticed that the tab is
not radiused and we may be able to radius it and prevent a crack. Also since
we installed the outside fasteners as an interference fit HiLoc there is no
possible movement in that area.
--
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dlm46007(at)cox.net
Guest
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| Posted: Tue Jun 10, 2008 10:23 am Post subject: Service Bulletin |
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Just spoke with Vans and the pictures will be going up on their website. The
crack was near the tab that steps up to attach to the longeron. He did agree
that HiLocs could be installed there probably easier than rivets and that it
may be possible to install the doublers without pulling the top up
--
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