There is also a marked difference in the amount of de-icing which some people carry out.
1. Some go to whole hog and do the whole lot including air frame.
2 .Some just go for the flight surfaces
3. Some the flight surfaces to just past the peak of the aerofoil.
4. Let410 operators who brush the worst of it off and go flying
And with the above there seems no connection between experence, qualifications or aircraft type. Proberly a bigger link is tightness of wallet and can't be arsed factor.
Personally if its a frost i will do 3 on the wings and the whole of the tail plane.
Anything heavier than that number 2. And brush the rest down.
And maybe the cowling so bits don't blow back on the TO roll.
Safest of course is number 1 but as a drum of the proper stuff costs 90quid plus flying instructors are under alot of pressure not to do it. My method seemed to be a compromise which I was happy with and the boss.
The other method which shouldn't be used is stick an extra 5 knts on your speeds and go for a 15min flight. This i have seen a few times and is highly daft. It will work for years but one day it will bite your bum.
MJ