"Jim Macklin" wrote in message news:EONKg.6848$SZ3.627@dukeread04...
: The STC only shows that the airplane still flies OK. Old
: FAA rules did not require a placard "Flight in icing
: conditions prohibited" so those airplanes with that placard
: limitation that get the full kit might be legal to fly under
: FAR91 into ** forecast ** ice.

Just a nit here...anyone can fly in an area of forecast icing...it is only after a PIREP that ice is actually there is
the known icing present and therefore operations in unapproved aircraft prohibited. Not talking about judgment here...