Today's Message Index:
----------------------
1. 12:41 AM - Re: Tailplane front spar crack (Etienne Verhellen)
2. 12:42 AM - Re: Tailplane spar... (Etienne Verhellen)
3. 10:34 AM - Re: Re:Tailplane front spar crack (Brian Lloyd)
4. 10:38 AM - Re: Re:Tailplane front spar crack (Brian Lloyd)
5. 10:56 AM - Re: Tailplane front spar crack (Elmar & Manuela Hegenauer)
6. 03:16 PM - Re: Tailplane AD (Jay McIntyre)
7. 05:30 PM - Re: Re:Tailplane front spar crack (Bitterlich, Mark G CIV Det Cherry Point, MALS-14 64E)
Message 1
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| Subject: | Re: Tailplane front spar crack |
Here is the UK CAA version :
http://www.caa.co.uk/docs/33/20111216MPD2011010.pdf
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=364864#364864
Message 2
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| Subject: | Re: Tailplane spar... |
Here is the UK CAA version (Mandatory Permit Directive) :
http://www.caa.co.uk/docs/33/20111216MPD2011010.pdf
--------
http://www.flyforfun.be/?q=yaks
http://www.planecheck.com/eu/index.asp?ent=dv&id=6711
http://www.airshowactionphotography.com/san07/page1.html
http://www.irishairpics.com/photo/1029467/L/Yakovlev-Yak-52/G-CBSS/Etienne-Verhellen/
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=364865#364865
Message 3
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| Subject: | Re:Tailplane front spar crack |
On Tue, Jan 24, 2012 at 8:06 PM, doug sapp <dougsappllc@gmail.com> wrote:
> Craig,
> I think we may have had this discussion before, I can't recall for sure, but
> you are correct in that an fix was engineered, but rather it was actually
> "accepted by the FAA" is up for debate and really does not matter. It is in
> my opinion a very poor fix indeed, it simply makes the center of the spar so
> stiff that it cannot flex, the result is that iteffectively shifts the
> stress the the edges of thedoubleras you have correctly stated.
Yes, you are right Doug. We had this discussion on here when the list
was first started. I remember suggesting that the doubler transfers
the stresses to the spar at the end of doubler, just moving the
problem rather than solving it. I suggested a tapered or laminated
doubler so that the stresses are transferred gradually from the
doubler to the spar along the length of the doubler.
OTOH, since no one seems to be seeing new cracking at what appears to
be the new stress point at the end of the doubler, we have solid
empirical evidence that there isn't a problem with the current doubler
design. So even if it appears to be a poor design, the evidence
suggests that it is working OK.
At this point I think I am going to come down on the side of, "if it
ain't broke, don't fix it."
--
Brian Lloyd, WB6RQN/J79BPL
3191 Western Dr.
Cameron Park, CA 95682
brian@lloyd.com
+1.767.617.1365 (Dominica)
+1.916.877.5067 (USA)
Message 4
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| Subject: | Re:Tailplane front spar crack |
On Wed, Jan 25, 2012 at 12:32 PM, Bitterlich, Mark G CIV Det Cherry Point,
MALS-14 64E <mark.bitterlich@navy.mil> wrote:
MALS-14 64E" <mark.bitterlich@navy.mil>
>
> Based on Dougs less than positive support for this fix, it would seem
that a wise thing to do would be to see the actual recommendations made by
the FAA Designated Engineering Representative (DER) regarding the repair of
this specific crack.
Well, as I suggested in my last email, we don't seem to be seeing any
cracking of the spars that have this mod, even if it appears that the mod
may not be the best design possible. The doubler appears to be working just
fine. I would counsel that people just keep monitoring those aircraft that
have the mod to see if it ever becomes a problem. I would *not* counsel
inventing problems and raising red flags with the FAA if there is no
immediate evidence of a problem, and there appears to be no evidence at
this point in time.
--
Brian Lloyd, WB6RQN/J79BPL
3191 Western Dr.
Cameron Park, CA 95682
brian@lloyd.com
+1.767.617.1365 (Dominica)
+1.916.877.5067 (USA)
Message 5
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| Subject: | Re: Tailplane front spar crack |
Please see attached picture.
cheers
Elmar
Message 6
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| Subject: | Re: Tailplane AD |
Hmmm... that is interesting.
Try
http://www.caa.govt.nz/Airworthiness_Directives/Airworthiness_Directives_Ae
roplane.htm
and then scroll through the list until you get to "CJ-6 series"
Cheers, Jay
On Fri, Jan 27, 2012 at 9:52 AM, Jerry Painter <wild.blue@frontier.com>wrot
e:
> *Hi Jay--*
> **
> *Can't get your AD link*
>
> *http://www.caa.govt.nz/Airworthiness_Directives/CJ6.pdf*<http://www.caa.
govt.nz/Airworthiness_Directives/CJ6.pdf>
>
> * to open--right URL?*
> **
> =EF=BB =EF=BB =EF=BB =EF=BB =EF=BB =EF=BB =EF=BB =EF
=BB =EF=BB =EF=BB =EF=BB =EF=BB =EF=BB =EF=BB =EF=BB
=EF=BB =EF=BB
> *Jerry Painter*
> **
> ** *Wild Blue Aviation*
> *425-876-0865*
> *FlyWBA@gmail.com* <FlyWBA@gmail.com>
> *www.FlyWBA.com* <http://www.flywba.com/>
>
> *Flight Training*
> *Aircraft Restoration and Maintenance *
> *Pilot Supplies*
>
> *Hangar 28*
> *Arlington Municipal Airport*
> *18228 59th Dr. NE*
> *Arlington, WA 98223*
> [image: FREE Animations for your email - by IncrediMail! Click Here!]
<http://www.incredimail.com/?id=619263&did=10500&ppd=2723,20110804121
6,9,[TypeID],[IM_UPN2]&rui=76916496&sd 120126>
>
Message 7
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| Subject: | Re:Tailplane front spar crack |
I don't own a CJ-6, so I really have no dog in this fight. Whatever you all think
is best is just peaches with me.
Mark
________________________________
From: owner-yak-list-server@matronics.com on behalf of Brian Lloyd
Sent: Thu 1/26/2012 1:35 PM
Subject: Re: Yak-List: Re:Tailplane front spar crack
On Wed, Jan 25, 2012 at 12:32 PM, Bitterlich, Mark G CIV Det Cherry Point, MALS-14
64E <mark.bitterlich@navy.mil> wrote:
>
> Based on Dougs less than positive support for this fix, it would seem that a
wise thing to do would be to see the actual recommendations made by the FAA Designated
Engineering Representative (DER) regarding the repair of this specific
crack.
Well, as I suggested in my last email, we don't seem to be seeing any cracking
of the spars that have this mod, even if it appears that the mod may not be the
best design possible. The doubler appears to be working just fine. I would counsel
that people just keep monitoring those aircraft that have the mod to see
if it ever becomes a problem. I would not counsel inventing problems and raising
red flags with the FAA if there is no immediate evidence of a problem, and
there appears to be no evidence at this point in time.
--
Brian Lloyd, WB6RQN/J79BPL
3191 Western Dr.
Cameron Park, CA 95682
brian@lloyd.com
+1.767.617.1365 (Dominica)
+1.916.877.5067 (USA)
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