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Thanks for the video. Great job with your sons!

I tolerate the music just to see anything about a navion.

I have an XP Hawke and first I have heard about this low rpm, so thanks. Since I don’t fly a lot, I always give it a good work out and don’t milk it, and not below this rpm.🫡from Australia 🇦🇺

Why didn't you mention right off the bat that that the snap ring has 2 sides? One is square and the other is rounded and some of the snap rings were put in backwards with the rounded side out.

Great vid, I used to work in a part 145 engine shop doing tear down (and test cell). To remove those counterweight snap rings was challenging while the bare crank was vertical on a stand! I cannot imagine replacing one through a cylinder bore in a case while engine is installed on aircraft. A&P/IA,ASE

Has anyone ever done research to replace circlip technology with Spirolox retainers?

Nice to work on as well👍🏻

Probably the bane of the TSOI520D (discontinued)

Seems like a piss poor janky setup, hard to believe a conventional crank like they use in the majority of every other internal combust engine.

It is my understanding that the counter weights are there to dampen the harmonics of the prop. That is why you have a restriction on RPM. Alot of planes have a yellow arc on the tach as a "do not operate at this RPM for prolonged periods". Your description of how the counter weights work is totaly wrong. Sorry.

Excellent Video and Explanation of what is going on, or not going on LOL, with the airport, I think I should start coming to the meetings so I can see in person just what you're talking about. Thanks again. I just live here in Hayden and a lot of planes come right over the house in the summer on approach so no excuses for me not coming and listening too . Thanks for taking the time to do this.! Really Interesting

I stopped watching at 7:30 just to say that the engine seizing is not the worst part of it, it's what happens immediately afterward. Back in 2015, a good friend of mine crashed his V35B Bonanza after his engine seized at 500 feet AGL on takeoff, due to the exact mechanism you're describing. His engine was around 100 hrs after TBO, an IO520. One pin dropped out and the swinging counterweight cleaned out half the crankcase, taking one cylinder and both magnetos off as it went around. He had just throttled back to best climb from takeoff power, which as @mpgofast alludes unloaded the weights momentarily. Subsequent teardown of what remained of his engine showed the circlips incorrectly installed on another of the weights. He was airborne only 33 seconds after the failure, he sustained severe injuries, but his three passengers walked away with bruises. FWIW, I've flown with him many times, including twice from NC to Oshkosh, he does not mistreat his plane and flies according to the POH and his 15+ years of flight experience.

You didn't mention the E-225-4 from that Navion there in your shop. I called Contenental though, and that engine is not effected... nice to fly a Navion ! Good Video...

Thanks for good videos

❤❤❤

Who in his delusional mind got the idea that a simple c-clip is "ok" for fast rotating engine parts?

Man oh man, I can just smell that startup exhaust!

Yes very painful meeting, the chair needs to get to the business of the airport, too much wasted time for all involved, thanks to the board members for their time.

Same as in Alaska, great season coming up let’s have some fun!

A classic!!

Hi Shane

Greetings from the UK :D It's great to see someone so passionate about their work, and not just bad-mouthing the bureaucracy but also prepared to put the work in to help educate the people involved, and support a whole area of their community. Hopefully some of the board is watching and will take you up on it, and that things will run better and smoother for all involved in future Keep it shiny side up!

That is really cool

YES

Literally, a dream of mine is to go float plane fishing.

very cool

Right on with the video on the Advisory Board meeting, Shane. I think the members just need to focus on critical items needing fixing and save the parliamentary discussions for Special Meetings. The new Board has good intentions, they just need to re-group and move on to getting things accomplished before the busy season. Thanks to all the Board members for your service and thanks to Shane.

Thank you for all you do for Local Aviation.

Airport Nazis, that's what the last few "managers" were, demanding to see log books, one told me the "FAA runs the airport" (it's a county airport), ass kissing, influence peddling, condescending people who don't even fly. They were offended when my mechanic came to work on my plane because I didn't use their buds on the field. They really do think owners and pilots of little airplanes are unsophisticated nuciences, they want us to be a "regional jetport"

Well, it seems like any level of gubment nowadays has become a subset of the population that just does not associate with reality. It sucks that North Idaho has become Upper Northern Southern California. Do any of our other local airports have the same issues? SZT or DEW, IS6, 65S or anybody else? I've heard there are a lot of HOA issues at Treeport, Hackney seems to have their 💩in a group. Thanks for the update for those that couldn't make the meeting though, good information flow is key.

Thx Shane, it was painful to watch and listen to.

Great video except for the "it won't be a sweatshirt" part.

Thanks for sharing! I appreciate the update for locals like me.

The service bulletin, in this case, is Bull Shit...sorry. I've been running my O-470 at 1900 / 21 for years.

I think you missed the part of the AD that explains the snap rings are installed upside down. The other problem was for Air New England flying 402s Boston to Nantucket at 19inches manifold pressure.

nice!

What is the world going to do when mechanics are gone? Fat fingered twitter feeds will be the end of anything real happening in any meaningful way.

Semi-genuine question: Why are they using C-clips rather than spiral lock retaining rings? I know, I know, who are we to question the almighty OEMs...

For someone who's read the AD and still doesn't know what was being done wrong you must be pretty dumb.

So it seems this is the current batch of engines, not all of them. If it was a car they would be recalled and repaired by the manufacturer. Personally this seems to be a very crude system having some weights rattling around on the crank

Floating weights on a crankshaft has got to be the most retarded thing I've ever seen on any motor in my life. Someone please take that engineer that designed this out behind the woodshed and give him the Old yeller treatment before somebody gets killed from this.

victor-aviation : CTScan X-Ray Analysis Inspection in 3D... a good referance. CYta salute 😐

$850 for any jug pulling? Seems very low. Lots of Cessna 185 and 206's that use the IO-520 out here in NW Alaska.

snap ring pillars

I'm surprised they use a snap ring and not the dreaded spiral lock.

pretty frightening stuff .... loose steel weights banging around on a crankshaft.....i'm way out of the flying addiction at my age now, but back in the day i always preferred lycoming engines....everything i read about continentals seemed to come up short compared to the same spec lycoming

The Navion is rock-solid. Just keep up the maintenance and it will be good for another 75 years.

What a beautiful airplane

Hmm - opposed cylinder "boxer" engines don't need counterweights. The pendulum dampers you mention are there to stop the crank from winding up and springing back at one specific frequency.