Originally Posted by WEACLRS

aahhgg! You are correct. I'm out on a trip and just did a search of the FAA regs database and didn't check the section. I remember that reg from my corporate days. However, I have read something else. I will have to find it. In the meantime I'll edit my first post...

Ok. Here is the info from the advisory circular from a regulatory point-of-view for general part 91 operation:

"d. Aircraft Not Certificated for Flight in Icing Conditions.

(1) Aircraft certificated since the mid-1970s that are not certificated for flight in icing conditions will have a limitation in the AFM or POH and possibly a placard on the aircraft stating that flight into “known icing conditions” is prohibited. “Known icing conditions,” as defined in the AIM, are conditions in which ice is observed or detected in flight, by your aircraft or another aircraft, or an airport. Such limitations are binding under § 91.9, Civil aircraft flight manual, marking, and placard requirements, and this regulation takes precedence over §§ 91.527 and 135.227. However, if a pilot of such an airplane were to takeoff and fly in area in which icing is forecast (e.g., AIRMET Zulu), it is expected the pilot will through preflight planning and in-flight execution:

(a) First attempt to avoid areas of “potential icing conditions”, which are areas of visible moisture such as clouds at temperatures below freezing;

(b) If that is not practical, attempt to avoid areas of forecast icing by all tools available (e.g., AIRMETs, SIGMETs, CIP and FIP); and

(c) If icing is encountered, declare an emergency and exit the conditions immediately.

NOTE: Failure to follow the section above may result in enforcement action under § 91.103, Preflight action, or § 91.13, Careless or reckless operation, depending on the circumstances and the actions a reasonable pilot will take."

As stated above AC 91-74A is a good read.