I think you’ll find if you purchase a cirrus that having that little red knob is an absolute
I don’t know in what flight regime you saw walt adjusting the mixture, in climbout on an
sr22 there are some adjustments to make, but they are pretty trivial. At cruise, you set it
and can forget it.
Cirrus drivers are (generally) blessed that our engines will run smoothly from rich to
very lean of peak. That means that one little knob allows you to pretty much choose
exactly when you land, or how much fuel you have in the tank when you do. There’s
not a FADEC system on earth which will do that, nor one in the works I know of.
If it’s workload you’re worried about, don’t. I have found that, when you are trained on
the systems, the cirrus cockpit is VERY low workload, perhaps that’s why people
mess with the mixture, there isn’t a lot else to do but look out the window.
The only benefit I can see from FADEC is what we got with the first electronic
ignitions on cars, better sparks and more dynamic timing. If that happened it might
be good, but personally I’d still want the red knob there and just have the computer
control the spark for me. You will find that you can get amazing efficiency with
that manual lever and a little reading of the COPA group lists.
I think also it’s my turn to say if you’re really serious about Cirrus, joining COPA does
open the door to the member’s archives and there is nothing I know of talked about
more there than leaning, mixture, LOP operations etc.