I recently flew on a flight out of Montreal on a DHC8 turboprop. The plane had been parked at the airport overnight during a winter storm, and as I walked out to the plane, there were visible icicles accumulated on the wings. There was also a layer of ice completely covering the windows on one side of the plane, presumably because of the direction of the prevailing wind during the storm.
The plane was successfully de-iced and took off without a problem. However, I had some questions about the de-icing process as I observed it from inside the plane.
The ground crew had to de-ice the propellers manually before the engines could be started. Is this mainly because of the risk of ice ingestion in the engines, or is there a problem with the propeller being imbalanced because of uneven weight? Or both? Or neither?
The de-icing by the trucks seemed to focus on the wings, and it looked like there was still some ice left on the exterior windows when we left the de-icing pad. My understanding of icing is that ice on the wings is extra-bad (I remember a fatal crash happened near me due to wing ice when I was growing up), but does ice on the fuselage affect the flight characteristics of the plane? Or is it not really a concern?