Re: FAR 91.157 Operating in icing conditions

Mike Rapoport wrote:

> I don't think that Collins would disagree that forecast icing is known
> icing.  He might choose to launch anyway but the legalities are clear.

Here's an interesting footnote to this whole discussion.  Since I'm planning 
a trip in the U.S. next weekend, earlier this evening I was playing around 
learning the Java applets at

http://adds.aviationweather.gov/java/

They're very neat, but I noticed that the U.S. CIP showed (Monday evening) a 
high probability of icing all around southern and eastern Ontario and 
Northern New York from the surface to 10,000 ft: definitely a no-fly day.

Just out of interest, I then glanced at the Canadian GFA for turbulence and 
icing:

http://www.flightplanning.navcanada.ca/Latest/gfa/anglais/Latest-gfacn33_turbc_000-e.html

It had no icing forecast at all in this part of Canada Monday evening, aside 
from the boilerplate warning "GENLY LGT RIME ICGIC ABV FRLVL" which is 
automatically printed on every chart: obviously a perfect night for an IFR 
flight.

In the event, by late evening there were no icing PIREPS in the Montreal or 
Toronto FIRs.


All the best,


David