"Richard Kaplan" wrote in message ws.com...
"Peter R." wrote in message
...

Syracuse, NY. From what I understand about the system, the difference
between the not known icing and the known icing TKS system has to do
with redundancy, not functionality. In other words, known ice TKS
system has a backup pump and, IIRC, requires backup electrical.

Another difference is in-flight icing testing of a prototype airplane is
required for known-ice certification.

Another difference is that known-ice requires that the engine still
run during ice encounter. A TKS system does not keep your fuel vents,
etc from freezing. One of the differences between the Mooney 201 and
231 (the 231 has known ice as an option) is the fuel venting.

-Robert