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I have had an intermittant, "light" shimmy on rollout on several landings. These have been separated by several landings where there was no shimmy. The ESCO strut was rebuilt by Lancair 8 months ago due to an towing damage (too small a turning radius). A stronger strut shaft and wider turning stops were installed. Since then I have serviced the strut, changed and balanced the tire, checked the bearing preload and tried different tire pressures. (I've also replaced the disks thinking the shimmy was brake related at one time.) The shimmy seems to be fixed...only to return within a few flights. I have the new design nose strut on order from Lancair.
Now, for the question. Do you have photos of the failure locations on your engine mount. I have decowled and examined the engine mount numerous times after a shimmy event to look for any fatigue cracks and have found none. But I will redouble my inspection when I replace the strut if you can point me to all the right places. Can you enlighten me?
Barry Knotts
LIV-P, Conti TSIO-550, N4XE
Perrysburg, Ohio
ptackabury@aol.com wrote:
How 'bout something re: LIV rather than personal etiquette, scripture, other's misfortunes and the Hanoi Hilton. As the keenly aware out there may remember, I have a LIV that was, up until 23 Jun a screaming joy with no problems. And then while landing in Fort Morgan, CO to visit my brother, I had a nose wheel shimmy that destroyed the motor mount (broken in at least 4 places), strut, fork, trailing links and over center gas spring, along with associated hardware and the bottom cowling. The only good news was the strut didn't fold, although I still do not know how it remained upright. Michelle and Kim at Lancair were fabulous and had replacement hardware to me on Friday the 26th. My brother and I have been rebuilding ever since. We have now replaced the main parts and are rigging the engine to fit the cowling in hopes of a flight back to CA (home/Chino) this weekend where the final redo will take place.
Some observations: I think the strut was OK--it was about 6 years old but looked fine. I now have the new strut Lancair is building so maybe something was wrong with the old ECCO model. The engine mount just disintegrated so maybe it had some cracks i missed during the Jan annual--certainly that will be a major focus in all future cowl removals. So learn what you will from this msg--question as you wish and I will offer what I can. But be assured this incident had nothing to do with my dual LSE ignition system...
paul, N94PT, reluctant rebuilder
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