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  #51  
Old 01-30-2019, 12:53 PM
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Quote:
Originally Posted by Christopher Murphy View Post
Didnt the Rv12 thing turn out to be ramp damage?
Cm
You mean this thread? http://www.vansairforce.com/communit...d.php?t=124185

Be sure to read *this* one, too...

http://www.vansairforce.com/communit...d.php?t=157206
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  #52  
Old 01-30-2019, 02:28 PM
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I like doing post-flight inspections also. They are best with a nice hobby IPA in hand!

CJ
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  #53  
Old 01-30-2019, 03:32 PM
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Quote:
Originally Posted by Christopher Murphy View Post
Didnt the Rv12 thing turn out to be ramp damage?
Cm
No one will ever know, I suspect. Sensenich isn't saying, and the OP is no longer with us.

I do a pretty thorough pre-flight inspection of the prop on our RV-12, and usually a pretty thorough post-flight as well. I like to think I've always examined it closely enough to catch a crack like that, but you can bet your propeller my level of pre-flight scrutiny will be raised a notch now.
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  #54  
Old 02-01-2019, 11:21 AM
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Just spoke with Don Rowell at Sensenich. He is going to send me the findings from his engineers, but net-net, they couldn't find a specific reason for the crack. It was indeed cracked through the laminate. According to Don, due to the construction of the prop and the metal spar inside, there was no danger of a catastrophic failure, but they have not been able to determine the cause.

I should have two new blades in hand by the end of next week. Needless to say, my preflight routine will involve a flashlight and a tactile and visual examination of the prop, as well as wipedown after flights.

I'll post the info from his engineers (with his permission) when I get it.
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  #55  
Old 02-01-2019, 11:34 AM
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Default NTSB Report yet to be published

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Originally Posted by DaleB View Post
No one will ever know, I suspect. Sensenich isn't saying, and the OP is no longer with us...
The NTSB Final Report has not been published yet. I wouldn't expect Sensenich to say anything about that propeller while the NTSB is investigating. The accident happened in January of last year, so it may still be several months before they publish the Final, and of course, the propeller may or may not be a topic of interest in their investigation. If the NTSB does not report anything of interest regarding the propeller, then I agree with you..."no one will ever know..."

That report will probably be read by many people, for varying reasons.
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  #56  
Old 02-01-2019, 12:13 PM
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Originally Posted by rv7boy View Post
The NTSB Final Report has not been published yet. I wouldn't expect Sensenich to say anything about that propeller while the NTSB is investigating. The accident happened in January of last year, so it may still be several months before they publish the Final, and of course, the propeller may or may not be a topic of interest in their investigation. If the NTSB does not report anything of interest regarding the propeller, then I agree with you..."no one will ever know..."

That report will probably be read by many people, for varying reasons.
The prop split happened long before the accident, he was flying with two nearly new blades when he crashed.
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  #57  
Old 02-01-2019, 03:46 PM
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Default Correction

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The prop split happened long before the accident, he was flying with two nearly new blades when he crashed.
OK...I wasn't aware of that as I didn't keep up with all the details of his RV experience. Thanks for correcting me.

So, your statement that "no one will ever know" is probably right.
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  #58  
Old 02-01-2019, 04:28 PM
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Closing this out, here's the statement from the engineers at Sensenich published with Don Rowell's perimission:

"The crack occurred at the 30% ply drop. While the crack did not and likely would not have propagated into the spar, it did go through all layers of the skin laminate. We cut into the laminate at the crack location, but we were unable to find any abnormal type of discontinuity. This is the first like this we have observed on a production propeller blade.

It is our recommendation that we replace both blades free of charge. At this point, we believe this to be a discrete failure due to an irregularity that industry standard quality control practices were unable to diagnose.

We have sectioned the blade, and will certainly continue to diagnose and if needed correct the issue that caused the failure. We do feel strongly that the alternate load paths found in the blades would have prevented this failure from becoming catastrophic."

As I said above, I will monitor the new blades carefully. As someone else said, there's no such thing as a company that hasn't supplied defective product. I expect to have a good experience with the new blades and think that Don and his staff have done all that can be expected.
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  #59  
Old 02-01-2019, 04:45 PM
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Thanks for posting that. I'm glad it had a good outcome for you, both financially (blades replaced) and otherwise. I also found the engineer's statement at least somewhat reassuring.
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  #60  
Old 02-04-2019, 07:04 AM
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Thanks for the update. Glad they are owning the responsibility and giving you a new prop and even happier that it all ended up well.
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