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Terry Phillips
Joined: 11 Jan 2006
Posts: 346
Location: Corvallis, MT
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 Posted: Fri Apr 29, 2011 12:52 pm Post subject: NTSB Has Release the Probable Cause for Agnos |
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The probable cause for Agnos has been released:
http://www.ntsb.gov/aviationquery/brief.aspx?ev_id 091107X34009&key=1
The NTSB Conclusion:
"The National Transportation Safety Board determines the probable
cause(s) of this ACC as follows:
The in-flight separation of both wings due to aileron flutter. The
aileron flutter was the result of inadequate wing stiffness and the lack
of aileron counterbalances."
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Terry Phillips
ttp44~at~rkymtn.net
Corvallis MT
ZU-601XL/Jab 3300 s .. l .. o .. o .. w build kit - Tail& flaps are done;
Upgrading wings& ailerons per AMD Safety Directive
http://www.mykitlog.com/N47TP/
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_________________
Terry Phillips
Corvallis, MT
ttp44<at>rkymtn.net
Zenith 601XL/Jab 3300 slow build kit - Tail feathers done; working on the wings. |
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psm(at)att.net
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| Posted: Fri Apr 29, 2011 1:10 pm Post subject: NTSB Has Release the Probable Cause for Agnos |
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Hi Terry,
Thanks for posting the link to the NTSB report.
I saw two new things in this report. First, nobody has ever before
actually blamed flutter for one of these accidents. There have been
plenty of suspicions but no actual determination. Second, they talked
about compression failure on both top and bottom spar caps. This
suggests to me the whole wing was "Waving" up and down and not just the
ailerons.
I am hopeful we will see no more of these accidents in planes where the
design upgrade has been installed. I also hope those who have decided
not to install the upgrade reconsider their decision.
Paul
XL nearing inspection.
On 4/29/2011 1:45 PM, Terry Phillips wrote:
| Quote: |
The probable cause for Agnos has been released:
http://www.ntsb.gov/aviationquery/brief.aspx?ev_id 091107X34009&key=1
The NTSB Conclusion:
"The National Transportation Safety Board determines the probable
cause(s) of this ACC as follows:
The in-flight separation of both wings due to aileron flutter. The
aileron flutter was the result of inadequate wing stiffness and the
lack of aileron counterbalances."
|
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steve.freeman(at)syntaxds
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| Posted: Fri Apr 29, 2011 1:16 pm Post subject: NTSB Has Release the Probable Cause for Agnos |
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That seems pretty straight forward.
Do not archive.
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Terry Phillips
Joined: 11 Jan 2006
Posts: 346
Location: Corvallis, MT
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| Posted: Fri Apr 29, 2011 7:20 pm Post subject: NTSB Has Release the Probable Cause for Agnos |
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Hi Paul
I very much agree that the evidence suggests that the whole wing was
waving up and down (flutter) and that the resulting stresses on the wing
spars caused wings to fail. I personally believe that the XLB mods will
eliminate the possibility of flutter in the modified aircraft, and that
there will not be any future wing loss accidents in the XLB fleet. I
also hope that all owners of 601XL's will choose to install the mods.
I wish you the best of luck with your XL. Please keep us informed as you
progress through your test phase.
Terry
On 4/29/2011 3:03 PM, Paul Mulwitz wrote:
| Quote: | Hi Terry,
Thanks for posting the link to the NTSB report.
I saw two new things in this report. First, nobody has ever before
actually blamed flutter for one of these accidents. There have been
plenty of suspicions but no actual determination. Second, they talked
about compression failure on both top and bottom spar caps. This
suggests to me the whole wing was "Waving" up and down and not just
the ailerons.
I am hopeful we will see no more of these accidents in planes where
the design upgrade has been installed. I also hope those who have
decided not to install the upgrade reconsider their decision.
Paul
XL nearing inspection.
|
--
Terry Phillips
ttp44~at~rkymtn.net
Corvallis MT
ZU-601XL/Jab 3300 s .. l .. o .. o .. w build kit - Tail& flaps are done;
Upgrading wings& ailerons per AMD Safety Directive
http://www.mykitlog.com/N47TP/
| | - The Matronics Zenith-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Zenith-List |
|
_________________
Terry Phillips
Corvallis, MT
ttp44<at>rkymtn.net
Zenith 601XL/Jab 3300 slow build kit - Tail feathers done; working on the wings. |
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