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The old style valves should have detents too. If yours doesn’t, that would be a motivator for me to replace it. There are ADs for this on other Piper airframes with similar valves.

Try methodically disconnecting a few thermocouples at a time and see if it makes a difference. Did you or your mechanic have to do any harness building/pinning that could have gotten reversed? The JPI manual does a good job of not referencing positive or negative for the thermocouples but the...

Yes, there is a small storage area behind the rear seat.

It's a matter of opinion. The same thing has happened in the auto industry for years too.

In the case of the Pipers, I believe an upfit shop installs the engine after the aircraft is completed. So yes, they are mostly completed first with an o-360 then upfit with the diesel later. I don't remember if Piper contracts the engine change out to a third party or if it is just done in a...

I’m fairly sure the current diesel offerings from Piper are installed via STC. I don’t think they are the STC holder either.

While certainly a challenge, I think obtaining airframe approvals and offering affordable conversion packages will present the bigger problem. Lycoming and Continental have a leg up in this area because they already have airframe approvals and the OEMs are using them. Finding an OEM that is...

That works well in theory, but as you have seen from the UND case, people won’t study it right. I fully expect a transition to unleaded fuel to go similar to the 1970s switch to unleaded fuel in automobiles, or more recently, the widespread adoption of ethanol blended fuels. There has been lots...

Not if the full rich setting isn't rich enough. There are a lot of different carburetor part numbers with different calibrations for different applications. Some have a richer full rich calibration than others. A carburetor calibration on the lean side may be exacerbated with a change in fuel.

Does that weight include the coolant and cooling system? Or just the engine? Diesels will generally be more efficient, not less, but not by a large margin. So you could carry less fuel but the fuel you do carry is going to weigh more. Ultimately, I think this is a wash for performance and fuel...

What we need is a constrained test (multiple tests would help too). From the sounds of things, the UND “test” was not. We do this kind of stuff in the engine test lab in which I work all the time. One would think Lycoming and Continental would have done some unleaded fuel testing by now but...

Valve and seat material choice may be an issue. Of course, you’d think Lycoming would have considered that already, as they have published documentation stating that their engines will run on unleaded fuels. I also have a hard time believing that UND’s engines did not ingest ANY leaded fuel...

The Chinese will build at whatever quality level they are commissioned to, but the price will reflect it. Where ethics can become a problem is that they'll start cutting corners to increase profits hoping that their customer doesn't notice. Sometimes they do, sometimes they don't. The reason you...

Because you may not have enough paperwork to prove that you actually have the authority to sell it. Before I did anything, I'd work on getting the aircraft ownership transferred to you. Once that process is completed then there should be minimal trouble. Lots of people can't figure out how to...

From Rotax?

Not all states have such requirements, although I am aware that some are stricter. I have vehicles registered in both states that I have residences in.

I'm curious, what was his reasoning for the personal limitation? I didn't limit myself like that but I was also working on a lot of the same aircraft before I had a mechanic certificate at all.

You don’t understand. Your “federal address” isn’t changing. It’s just the address that the FAA is using to send correspondence. There’s no reason it couldn’t be the same as your driver’s license. I use one property of mine for residency despite it now t being the property I am at more. I pay...

Then you created your own problem. The FAA simply wants an address where they can contact you and send things to. In my opinion, your best option at this point would be to either change your driver’s license or your address with the FAA. PSI is not really the issue here, they’re just a...

In my opinion, you’re making your life not fit in the boxes. Pick an address and use it for all your dealings with the FAA. What did you use for your student pilot certificate and medical? I also have multiple residences. It has never been a problem.