King Air 200 engine question
 

Hi there! I am new to the forum, so I am not sure how to use properly. However, I have a question about the King Air 200. In the the exhaust section, outside the nacelle, there is a metal piece much like a tube or something similar, which you can touch with the hand. I have looked the manual and could not find what is that for. If anyone knows the answer I would be really grateful.

Thanks a lot.

The only thing that readily comes to my mind would be the exhaust shroud itself, but I'd not touch it too soon after the engine was shut down. The purpose of these is to deflect the exhaust gases backwards, just like any other tail pipe. This is readily evident on a King Air (or any other aircraft using the same setup) because the PT6 is a reverse flow engine; the turbine and exhaust sections sit in the front of the engine, while the intake and compressor sit near the rear.

As I sit here, really the only other thing that might come to mind would be the drain mast, but that sits back behind the nacelle and gear doors - nowhere near the exhaust. It's not seen in the picture below, but the exhaust shroud is rather prevalent.

https://cimg6.ibsrv.net/gimg/pprune....d8021372c1.jpg
Photo Credit: Meisner Aircraft

Ramrod's right - air inlet lip hot air anti-icing.

And that is why I love aviation, the simplest things sometimes.

https://cimg0.ibsrv.net/gimg/pprune....6fa489b15b.jpg
Exhaust shroud showing cowl heater tube. Photo Credit: eBay

https://cimg1.ibsrv.net/gimg/pprune....c858180bd8.jpg
Graphic, Cowl Anti-Ice System. Photo Credit: I wish I could give credit, but I don't know where this photo originally came from. It has been a part of every PT6 PowerPoint I remember seeing for the last 15 years.

Loving that this question is in the private flying forum! Can't be too many private flyers with a 200!

What ensures clockwise direction of gas flow in this setup?

wow I assumed that metal bit was just as protection for the inlet edge...

Just the way a little cup is installed in the duct.

https://cimg8.ibsrv.net/gimg/pprune....a224e0aa04.jpg
Photo Credit: nifs (e-bay)

You'll notice in the picture above that there is a hole formed into the shroud, welded onto which is a pipe leading away from the shroud. Above the hole is a cup.

In the left exhaust shroud (pictured), this cup directs some of the exhaust gases into the hole, then through the pipe.

In the right shroud, this cup could be reversed - that is, the open side would face away from you. The right shroud has, if you will, two sources of "exhaust" - one from the engine and one from the heated air intake.