Ron McKinnon wrote:

"Matt Whiting" wrote in message

Peter R. wrote:

...
If deicing were not an option, I would have had to get a hotel and wait
until the frost melted off the next day, or some liquid deicing were
available. In no case would I have attempted to take off with it on the
wing surface.

Why? It is acceptable to "polish the frost smooth" per FAR 91.527.


Interesting. It seems a rather dubious practice to me. It would indeed
appear to be legal in the US - but, FWIW, it isn't legal in Canada.

Why? Smooth frost is less of an aerodynamic issue that a thick layer of
dirt, bugs and dust...


Matt