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Circle on the tail

I'm assuming you mean the small black plug - although it's painted on some airplane. It is access to a bolt on an arm that is part of the elevator assembly.
If you're talking about the circle on the front at the bottom - that would be the air intake for the overhead vents. There's a vent above each seat similar to the kind of vents you have in commercial airplanes. Later planes actually have a NACCA scoop on the right side rather than the what we call donut hole in the front
 
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Commander91gm said:
I'm assuming you mean the small black plug - although it's painted on some airplane. It is access to a bolt on an arm that is part of the elevator assembly.
If you're talking about the circle on the front at the bottom - that would be the air intake for the overhead vents. There's a vent above each seat similar to the kind of vents you have in commercial airplanes. Later planes actually have a NACCA scoop on the right side rather than the what we call donut hole in the front
Click to expand...

Thanks this is exactly what I was looking for!
 
If you’re looking to spend some money Captain, and who isn’t that owns a Commander, there’s an aftermarket replacement for this “donut” dorsal fin to a replacement fin which has the intake on the side, aka the NACCA scoop as Joel says. It’s very easy to change out. Like everything, it is rumored you pick up a few knots airspeed due to the aerodynamics improvement. Yeah right.

It’s funny, the other day some kid lineman asked me what that hole was for and I told him I thought it was the intake for the APU on the plane.
 
Well I wouldn't say it's 'very easy' to change out to the NACA scoop. I had about 6 hours of trimming and work to get it to fit correctly. :)
 
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