"Wyatt Emmerich" wrote in message
...
Let's say you take off on a long cross country with no forecast of icing.
By
the time you arrive at your destination, a 2,000-foot layer exist below
you
with temps of 30 F. You are getting low on fuel. Is it legal to descend
through the thin layer even if you are in an airplane without known icing?

If you have a safe alternative, then descent through known icing-conditions
would be illegal in that scenario. But if it's the only way you can land
without risking fuel exhaustion, then you use your emergency authority to
override the regulations.