BW 350 PSRU Failure, please share the word!

[tjo]

A couple of comments FWIW:

1) Carrol Smith consistently cracks me up, and is also usually technically very accurate. (see post #4)

2) I have spent a good bit of time looking at and dealing with mechanical failures. Not necessarily shaft failures, but mechanical machinery and structure.

3) I agree that this looks like a failure caused by a fatigue crack propagation that finally had a catastrophic failure. Yes, it could have been some single event that started the crack, then propagated from there, but it is more likely from a manufacturing defect like bad heat treating. If this is true, it could effect a much broader population of drives. In any case, it warrants a close inspection and, in my opinion, the manufacturer should be clamoring to get his hands on the part for inspection and analysis.

4) If the failure was initiated by a 3g turn (which I don't believe it was) then the airplane should not even be considered normal category (3.8g), it should be considered... maybe... an air boat.

Tim

[Stuart Davis]

I am Stuart Davis, the owner of Auto PSRU?s. I have always had a policy of staying off of group sites to avoid postings that degrade too easily into ugly mudslinging disputes. If someone had not sent me an email about these postings I would not have known about it.

As ?cheapracer? pointed out early in these postings, this amounts to another abuse of social media. What is even worse are the postings from ?experts? in other fields that chime in with their miss-informed opinions. Survival and success in this industry is hard enough without this sort of fanning the fire.

I am not going to make any direct response to any of the postings made here. It would only degrade too easily into ugly mudslinging disputes and spin off even more miss-informed opinions.
Anyone that reads website postings has to keep three things in mind.
1 - They should question the history, facts, and motivation behind anyone?s complaints.
2 - They should keep a neutral perspective until more information comes out or checkout the facts themselves.
3 - They should realize that research shows the motivation to post complaints outweighs posting positive reviews by a ratio of over 20 to 1.

I have always been happy to explain the details of our gears, shafts, materials, clutch mechanism, and harmonics (TV) to anyone that asks. Most of what was posted here is wrong.

If you want to know the facts instead of someone?s miss-informed opinion just go to my website at www.autopsrus.com. To read detailed responses to these postings and learn more facts behind Andreas? problems with his used gearbox that was 9 years old when he bought it back in 2014 look under the ?Articles? link for ?Andreas Fiasco?. On that page is a button that will open a PDF file.

Thank you,
Stuart Davis
Auto PSRU?s

[scsmith]

Originally Posted by BillL

At least the OP got the plane on the ground in one (unbent) piece.

I'm really glad Bill posted this. This is the 'rest of the story' I was waiting for.

[bret]

Thanks for coming on here and providing the link to the rest of the story. A blocked vent won't just take out a seal on these units, it will do the same thing to a Lycoming.

[Bob Kuykendall]

Direct link to .pdf doc:

http://www.autopsrus.com/ckfinder/us...20Response.pdf

Wow, I sure got a lot of airplay out of that one!

[N395V]

Originally Posted by Stuart Davis

I am Stuart Davis, the owner of Auto PSRU?s. I have always had a policy of staying off of group sites to avoid postings that degrade too easily into ugly mudslinging disputes. If someone had not sent me an email about these postings I would not have known about it.

As ?cheapracer? pointed out early in these postings, this amounts to another abuse of social media. What is even worse are the postings from ?experts? in other fields that chime in with their miss-informed opinions. Survival and success in this industry is hard enough without this sort of fanning the fire.

I am not going to make any direct response to any of the postings made here. It would only degrade too easily into ugly mudslinging disputes and spin off even more miss-informed opinions.
Anyone that reads website postings has to keep three things in mind.
1 - They should question the history, facts, and motivation behind anyone?s complaints.
2 - They should keep a neutral perspective until more information comes out or checkout the facts themselves.
3 - They should realize that research shows the motivation to post complaints outweighs posting positive reviews by a ratio of over 20 to 1.

I have always been happy to explain the details of our gears, shafts, materials, clutch mechanism, and harmonics (TV) to anyone that asks. Most of what was posted here is wrong.

If you want to know the facts instead of someone?s miss-informed opinion just go to my website at www.autopsrus.com. To read detailed responses to these postings and learn more facts behind Andreas? problems with his used gearbox that was 9 years old when he bought it back in 2014 look under the ?Articles? link for ?Andreas Fiasco?. On that page is a button that will open a PDF file.

Thank you,
Stuart Davis
Auto PSRU?s

Thanks Stuart,

Always good to hear the rest of the story.