Greg, the intent is not to legalize anything, simply to clarify to pilots
just what ATC will do for them when icing is forecast. They (pilots) don't
have to take advantage of this procedure. At the same time, they don't have
to sit on the ground because the area from 30 to 40 miles east of SEA is
full of ice with clear sky above.

There is a 75 percent chance that ice will be encountered somewhere in the
huge volume of airspace included in an icing Airmet; there is a 15 percent
chance that a pilot will encounter ice on a specific route in that airspace.
Pretty good odds. The key is to take immediate action upon picking up ice
rather than to steam along hoping for the best.

Bob Gardner

"Greg Esres" wrote in message
...
The closest you can come is 91.9, so there is nothing to "trump"
because the POH wording is not consistent between manufacturers or
models (and, as some have pointed out, some POHs say nothing about
icing).

But some do, and the wording inconsistency doesn't seem relevent when
the meaning is clear. My Seneca says "Not approved for known icing",
and I don't think that ATC procedures can therefore make it legal.

And there is always 91.13 (Careless or Reckless) for the FAA to fall
back on.