[What is the proper way to stop the engines?]

Actually, most if not all aircraft are shutdown with the mixture/condition lever.  You can shutdown a piston aircraft with the magneto switch I suppose but that is not the recommended procedure.  If the magneto is always "live" (mechanical issue) you will not shut it down using the magnetos therefore cutoff is used.  A turbine engine has ignition only during starting, and when deice is turned on, it can be compared to as a blow torch. Ignition to light the fire, fuel feeds the fire till fuel is cut off (condition lever).

[Deicing]

For the prop deice element, yes it is a 3rd party repaint.  Now that I look at others, they are correct.

[What is the proper way to stop the engines?]

This is the proper way to shut down a turbine engine.  It is called condition lever.

 

The other waynis by pulling the T handle, this is only used in an emergency such as an engine fire.

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Love flying the Twin, just needs more tweaks in the approach/landing phase (power issues)

[Deicing]

I have been flying through icing for many flights now, pitot heat and prop deice seem to work.  Wing/tail deice do not.

 

Thank you for looking into this.

[Deicing]

Not sure but animation is not there for sure.

[Deicing]

No reply from Aerosoft...that's always a good sign!

[Deicing]

Will wing/tail deice ever be implemented animation and icing that affects the performance of the aircraft?

 

Also, in the attached picture the prop deice element (circled in red) is backwards.  I see that in the correct location there is a grey strip, maybe that was intended to be the element?

 

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On the climb CYTE to CYIK.