frankroskind(at)HOTMAIL.C
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 Posted: Fri May 09, 2008 10:12 am Post subject: Zenith Builders Analysis Group -- "I'm in" responders -- |
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I'd suggest that weather conditions on previous flights might be of interest, especially whether the plane had been exposed to very cold temperatures. Aluminum shrinks more than steel as it gets colder, so the bolts would provide less clamping force, and the holes, if tight, might put the aluminum around the circumference in tension, leading to crack initiation. At the same time the aluminum would be more brittle. If any stress were incurred, such as a hard landing, it might spread more easily through the cold-stiffened airframe. The eventual failure of the crack might be the inevitable result of an earlier initiation. I remain a sideline kibbitzer, as I am only considering purchase, but I hope the details are worked out. Good luck.
| Quote: | Date: Fri, 9 May 2008 09:12:42 -0600
To: zenith-list(at)matronics.com
From: ttp44(at)rkymtn.net
Subject: Re: Re: Zenith Builders Analysis Group -- "I'm in" responders --
At 06:24 AM 5/9/2008 -0700, you wrote:
| Quote: | Purely out of curiosity how are you going to handle this part?
7. I would rely on you to provide sources for relevant accident information. |
Very good question, Gig
The answer is that I'm going to do the best I can, and try to get help from other group members, if possible. So, here goes ...
The unfortunate part is, that as far as I'm aware, neither the NTSB nor ZAC have made available what I would consider important information, e.g., what options were installed in the airplanes that lost wings. The NTSB final report is available on the Oakdale crash. My plan is to put in a couple of days trying to gather whatever information I can find, mostly over the Internet, and send that to Mark. In addition, on 4/5/08 I posted a letter to Sebastien Heintz, President, ZAC, to make him aware of the analysis that we hope to begin soon, and to invite ZAC's participation at whatever level they would like. I chose snail mail because in my experience ZAC's response to email and website inquiries has been inconsistent (1 response from 3 or 4 messages). Obviously, there hasn't been time yet for a response from Mr. Heintz to my letter. I'm hoping that ZAC will respond, and positively. I'm not optimistic, however.
I believe that the following information would be important, and I would greatly appreciate help from Zenith-Listers in these areas - The actual structural differences between the European versions involved in the UK and Barcelona accidents and the US versions. I.e., something more detailed than "The Czech-built Zodiac XL (by Czech Aircraft Works) was re-designed and built lighter than its U.S. counterpart to meet European ultralight rules."
- Links to any information--websites, whatever, that would identify the options built into the downed planes.
- Links to any photos, video, written documents, whatever, that describe the wing failures as observed from the ground.
- Ditto for the failed components after an accident.
- Definite information regarding weather conditions in the areas where the accidents occurred.
- Definitive information, if available, that the Australian accident was caused by a bird strike. The only bird strike evidence that I recall is that fragments of the canopy were found at some distance from the impact point. However, distant canopy fragments in another accident apparently resulted from a wing impacting the canopy. I do recall posts saying that the wings were still attached to the Australian aircraft when it was located.
If Zenith-Listers could email links to any information they think might be helpful to me, off line, I will collect the links into a package, make an effort to organize them, and send them on to Mark.
I would like to do better. I would appreciate any ideas on gathering useful information.
Terry
Terry Phillips
ttp44~at~rkymtn.net
Corvallis MT
601XL/Jab 3300 s .. l .. o .. o .. w build kit - Tail, flaps, & ailerons are done; working on the wings
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