Ive only had icing around FL200 and up. But Ive done all my flying in the tropics. To give a blanket comment that it definitely wont happen below 4000ft to me is somewhat foolish. Whose the author by the way?And whats the Title?
On a practical note:
If you are in a CU below 4000FT ,I would hope you would be transiting it anyway, or trying to get out of it A.S.A.P. Keep those Passengers smileing. But if the temps are conducive ie. +5 deg or below , and theres is visible moisture ( look at the Windscreen). Theres no reason why not. In my books I bet there plenty of North American and European would back me up on that.
Most of myn icing Ive encountered between FL200 andFL250 ,in CU NS and other forms. I used to fly over water and land , but noticed I allways got more icing over land. I am assuming that different lapse rates were responsible for this. Anyway still unsure why.
Regards
Sheep
p.s. There are alot of books on weather. But there are no hard and fast rules to mother nature and its forces.
