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lwinger
Joined: 21 Jun 2006
Posts: 229
Location: Tustin, CA
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 Posted: Wed Apr 15, 2009 9:01 am Post subject: Initial Zenith Response |
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This just posted on the Zenith site:
NTSB Issues Safety Recommendation to FAA
April 15, 2009:
NTSB Safety Recommendation to FAA: http://www.ntsb.gov/recs/letters/2009/A09_30_37.pdf
Zenith Aircraft first became aware of the above NTSB Safety Recommendation Memo on April 14, 2009, at the same time the NTSB issued its press release to the public.
We continue to believe wing flutter will not occur if the control cables are adjusted properly. Nonetheless, we are carefully considering the points raised in the memo, including whether the Zodiac CH-601XL is susceptible to wing flutter. Each accident discussed in the NTSB memo occurred under different circumstances. Some of the accidents are still being investigated and what caused those accidents has not been determined.
Zenith Aircraft will communicate with the FAA about the issues raised in the NTSB memo. We will provide more information after we thoroughly consider the issues raised in the NTSB memo and we have spoken with the FAA about those issues.
ZENITH AIRCRAFT CO.
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_________________
Larry Winger
Tustin, CA
Plans building 601XL/650 with Corvair
Installing fuel system
www.mykitlog.com/lwinger |
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johnd(at)data-tech.com
Guest
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| Posted: Wed Apr 15, 2009 9:34 am Post subject: Initial Zenith Response |
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As a builder who's now got almost 10 hours on my airframe this response
from Zenith is really frustrating. Despite the # of governmental
agencies who are concerned about flutter, the accident rate and the fact
that planes have been grounded in some European countries for months now
their only response is that they need to consider the issues raised.
What the heck have they been doing the last 3-4 months ?
Then to explain that some of the accidents are still under review and
occurred under different circumstances, etc is ludicrous since it's the
NTSB who's doing the investigations and they are the ones who have these
concerns.
If indeed the Antelope Island accident is a spar failure as well, thats
really a concern to me since thats just too many planes with similar
failures for a fleet this size. I've been willing to avoid jumping to
conclusions up till now but at this point really want to see some
concrete actions by Zenith to either discredit the flutter issue by
comprehensive testing or to come out with a fix. The fact that they are
doing this in the UK but haven't had any plans to do this in the US
market is also annoying.
Sorry to vent...
John Davis
N601JD
Burnsville, NC
lwinger wrote:
| Quote: |
This just posted on the Zenith site:
NTSB Issues Safety Recommendation to FAA
April 15, 2009:
NTSB Safety Recommendation to FAA: http://www.ntsb.gov/recs/letters/2009/A09_30_37.pdf
Zenith Aircraft first became aware of the above NTSB Safety Recommendation Memo on April 14, 2009, at the same time the NTSB issued its press release to the public.
We continue to believe wing flutter will not occur if the control cables are adjusted properly. Nonetheless, we are carefully considering the points raised in the memo, including whether the Zodiac CH-601XL is susceptible to wing flutter. Each accident discussed in the NTSB memo occurred under different circumstances. Some of the accidents are still being investigated and what caused those accidents has not been determined.
Zenith Aircraft will communicate with the FAA about the issues raised in the NTSB memo. We will provide more information after we thoroughly consider the issues raised in the NTSB memo and we have spoken with the FAA about those issues.
ZENITH AIRCRAFT CO.
--------
Larry Winger
Tustin, CA
Plans building 601XL/650 with Corvair
Control surfaces and wings complete
Fuselage ready to rivet
www.mykitlog.com/lwinger
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p 39325#239325
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swater6
Joined: 16 Dec 2006
Posts: 52
Location: Minnesota-KMIC/KANE
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| Posted: Wed Apr 15, 2009 10:17 am Post subject: Re: Initial Zenith Response |
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_________________
601 XL kit N596SW reserved
Tail, control surfaces and both wings complete. Now working on fuselage
www.scottwaters.com
Last edited by swater6 on Wed Apr 15, 2009 11:39 am; edited 1 time in total |
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Rickey B.
Joined: 22 Mar 2008
Posts: 70
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| Posted: Wed Apr 15, 2009 10:17 am Post subject: Initial Zenith Response |
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Vent all you want! I'm pretty much in agreement!
Rick
As a builder who's now got almost 10 hours on my airframe this response
from Zenith is really frustrating. Despite the # of governmental
agencies who are concerned about flutter, the accident rate and the fact
that planes have been grounded in some European countries for months now
their only response is that they need to consider the issues raised.
What the heck have they been doing the last 3-4 months ?
Then to explain that some of the accidents are still under review and
occurred under different circumstances, etc is ludicrous since it's the
NTSB who's doing the investigations and they are the ones who have these
concerns.
If indeed the Antelope Island accident is a spar failure as well, thats
really a concern to me since thats just too many planes with similar
failures for a fleet this size. I've been willing to avoid jumping to
conclusions up till now but at this point really want to see some
concrete actions by Zenith to either discredit the flutter issue by
comprehensive testing or to come out with a fix. The fact that they are
doing this in the UK but haven't had any plans to do this in the US
market is also annoying.
Sorry to vent...
John Davis
N601JD
Burnsville, NC
DO NOT ARCHIVE
| | - 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:
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ashontz
Joined: 27 Dec 2006
Posts: 723
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| Posted: Wed Apr 15, 2009 1:02 pm Post subject: Re: Initial Zenith Response |
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What Chris is pushing is that he wants it to be known he's not a dumbass and designed and tested the plane to be flutter free and his implementation to avoid flutter is correct cable tension. Not how I would design it, but that's perfectly acceptible being that other planes also rely on proper maintenance to keep them airworthy, that's why it's call airworthiness, both the design and the condition determine airworthiness.
This is a matter of, well, there's an even better way to ensure airworthiness and it appears to be aileron balancing along with proper cable tension.
| Rickey B. wrote: | Vent all you want! I'm pretty much in agreement!
Rick
As a builder who's now got almost 10 hours on my airframe this response
from Zenith is really frustrating. Despite the # of governmental
agencies who are concerned about flutter, the accident rate and the fact
that planes have been grounded in some European countries for months now
their only response is that they need to consider the issues raised.
What the heck have they been doing the last 3-4 months ?
Then to explain that some of the accidents are still under review and
occurred under different circumstances, etc is ludicrous since it's the
NTSB who's doing the investigations and they are the ones who have these
concerns.
If indeed the Antelope Island accident is a spar failure as well, thats
really a concern to me since thats just too many planes with similar
failures for a fleet this size. I've been willing to avoid jumping to
conclusions up till now but at this point really want to see some
concrete actions by Zenith to either discredit the flutter issue by
comprehensive testing or to come out with a fix. The fact that they are
doing this in the UK but haven't had any plans to do this in the US
market is also annoying.
Sorry to vent...
John Davis
N601JD
Burnsville, NC
DO NOT ARCHIVE |
| | - 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 |
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kmccune
Joined: 22 Sep 2007
Posts: 577
Location: Wisconsin, USA
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| Posted: Wed Apr 15, 2009 2:02 pm Post subject: Re: Initial Zenith Response |
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Double check you cable tension and go fly.
Do this, and fly with in the design limits and you will be fine and happy.
Kevin
| johnd(at)data-tech.com wrote: | As a builder who's now got almost 10 hours on my airframe this response
from Zenith is really frustrating. Despite the # of governmental
agencies who are concerned about flutter, the accident rate and the fact
that planes have been grounded in some European countries for months now
their only response is that they need to consider the issues raised.
What the heck have they been doing the last 3-4 months ?
Then to explain that some of the accidents are still under review and
occurred under different circumstances, etc is ludicrous since it's the
NTSB who's doing the investigations and they are the ones who have these
concerns.
If indeed the Antelope Island accident is a spar failure as well, thats
really a concern to me since thats just too many planes with similar
failures for a fleet this size. I've been willing to avoid jumping to
conclusions up till now but at this point really want to see some
concrete actions by Zenith to either discredit the flutter issue by
comprehensive testing or to come out with a fix. The fact that they are
doing this in the UK but haven't had any plans to do this in the US
market is also annoying.
Sorry to vent...
John Davis
N601JD
Burnsville, NC
lwinger wrote:
| Quote: |
This just posted on the Zenith site:
NTSB Issues Safety Recommendation to FAA
April 15, 2009:
NTSB Safety Recommendation to FAA: http://www.ntsb.gov/recs/letters/2009/A09_30_37.pdf
Zenith Aircraft first became aware of the above NTSB Safety Recommendation Memo on April 14, 2009, at the same time the NTSB issued its press release to the public.
We continue to believe wing flutter will not occur if the control cables are adjusted properly. Nonetheless, we are carefully considering the points raised in the memo, including whether the Zodiac CH-601XL is susceptible to wing flutter. Each accident discussed in the NTSB memo occurred under different circumstances. Some of the accidents are still being investigated and what caused those accidents has not been determined.
Zenith Aircraft will communicate with the FAA about the issues raised in the NTSB memo. We will provide more information after we thoroughly consider the issues raised in the NTSB memo and we have spoken with the FAA about those issues.
ZENITH AIRCRAFT CO.
--------
Larry Winger
Tustin, CA
Plans building 601XL/650 with Corvair
Control surfaces and wings complete
Fuselage ready to rivet
www.mykitlog.com/lwinger
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p 39325#239325
|
|
| | - 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 |
|
_________________
“Always do what you are afraid to do.”
R.W. Emerson (1803-1882)
"Real freedom is the sustained act of being an individual." WW - 2009
"Life is a good deal...it's worth it" Feb 1969
Dorothy McCune |
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PatrickW
Joined: 27 Oct 2006
Posts: 380
Location: Fort Worth, Texas
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| Posted: Thu Apr 16, 2009 6:17 am Post subject: Re: Initial Zenith Response |
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| kmccune wrote: | Double check you cable tension and go fly.
Do this, and fly with in the design limits and you will be fine and happy. |
It would appear that the NTSB has a different opinion...
Patrick
N63PZ
| | - 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:
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Gig Giacona
Joined: 10 Jan 2006
Posts: 1416
Location: El Dorado Arkansas USA
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| Posted: Thu Apr 16, 2009 7:16 am Post subject: Re: Initial Zenith Response |
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| PatrickW wrote: | | kmccune wrote: | Double check you cable tension and go fly.
Do this, and fly with in the design limits and you will be fine and happy. |
It would appear that the NTSB has a different opinion...
Patrick
N63PZ |
We all know what opinions are like.
| | - 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:
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_________________
W.R. "Gig" Giacona
601XL Under Construction
See my progress at www.peoamerica.net/N601WR |
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Juan Vega Jr
Joined: 13 Jan 2009
Posts: 157
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| Posted: Thu Apr 16, 2009 2:04 pm Post subject: Initial Zenith Response |
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Patrick, any goverment group that gets lobbied enough will have an opinion based on what they are pushed to have an opinion on.
As ZBAGs did in this instance.
Juan
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