"the use of carburettor heat in heavy rain is recommended both to prevent build of of carby ice and to avoid engine stoppage"

I recall reading in some flying magazine article about having to use carb heat (seems like it was partial carb heat) in a C172 during heavy rain.  If my memory is correct (not necessarily guaranteed) that was for a specific C172 model and engine combination.  Later models of the C172 did not have this recommendation.  I don't remember ever seeing a similar recommendation in the Lycoming O-320 or O-360 powered Pipers or Grummans that I flew. Maybe I should look through the old POHs that I have in my library.

Tom Gourley