| I will attempt a reply here to Barry and others who have this combination:
If:
1. you have this combination of engine / prop (in any airframe, I've spoken to non-Lancair folks that have the same issue) 2. you have an engine vibration that normal methods can't solve (dynamic balance, motor mount change, etc.) 3. you have a vibration that changes with RPM or comes and goes over the course of a long flight
Then I suggest you remove the prop and do an eddy current / dye penetrant check of the prop flange. Especially if you have been living with this issue for a while (like I did), thinking it is an annoyance. It doesn't feel dangerous, just annoying. But it may be something bigger. I'm glad I didn't let it lie any longer.
Bob R
Thanks for the heads up. Not quite
sure what I will do with the information.
It seems to me that when Ed Smith had his "incident" there was
some discussion on LML about similar crankshaft separations in the
original Malibu engine / prop combination that our Lancair set-up
is based upon. I even recall seeing a photo of the front of a
Malibu with no prop. Instead it had a gaping hole in the
crankshaft showing where all the oil leaked out. There may be
additional information from the FAA or Continental if you add in
the Malibu fleet.
Barry Knotts
LIV-Ps, N4XE and N24XE
On 7/21/2013 11:54 PM, Robert R Pastusek wrote:
Gentlemen,
This is an alert for a potentially serious problem with the Continental IO/TSIO-550 engine/Hartzell 78” Scimitar propeller combination
Thanks,
Bob Pastusek
For LOBO
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