What to look for in a prebuy?

[JeffAxel]

Max pressure differential on the P337 is 3.35psi. Should hold a 10000ft cabin at FL200 with either engine running. Check the flap cables, they make a sharp bend and the damage is hard to see, Cessna put out a SB on this a while back. Use every radio, autopilot and piece of avionics and make sure they all do what they are supposed to do. Make sure the pitot heat works, hard to find replacements.

[mshac]

Let us know how it went today!

[mshac]

Well did you buy it or not?

After all the help we gave you, we want to know what happened!

[ljmolina]

Yes! She is mine now. I just flew in last night and abit tired of all the traveling to get to her and then the flight back home in her was exhausting.

The flight was uneventful as it should. There are a couple of quarks to fix here and there....but the main thing, it didnt hold cabin pressure. I did notice that one of the dump valves (rear) was stuck and didnt want to move so hopfully thats the cause, but the front dump valve slide in/out very smoothly. I will be looking at her this weekend.

She cruised at 165-170kts all the way home.

I do have one question, and I think I know the answer.. I was flying at 10,000ft and when I pulled back on RPM for the front engine and noticed the Manifold pressure drop a few inches... I did this to the rear engine and the MP held perfectly.... could it be the turbo?

[mshac]

Firstly, congrats on owning a P337!

I hope you got some consideration from the seller because it won't hold pressurization. I hope its just a dump valve, but I doubt it. Keep us informed.

The rpm situation on the front motor indicates one of three things:
1. Weak turbo
2. Weak/misadjusted wastegate
3. Intake leak

I'm sure there are other possibilities, but chances are good you'll find your issue in one of the above.

Enjoy your new airplane and don't forget: PICTURES OR IT NEVER HAPPENED!!!

[ljmolina]

Here she is after my flight home.

[mshac]

Nice!

Looks like it has intercoolers. You're gonna want to check all that intake piping for leaks on the front engine.

I attached the flight records from last night. Your speed claims are backed up by the data. Looks like you didn't get out of there until pretty late. I guess you got to test out all the lighting!