"Matthew S. Whiting" wrote in message
...
However, keep in mind that most thermometers have some error in them.
So, even though ice doesn't form above 0C, it may form above 0C as
indicated on your airplane thermometer.


Matt

That is true and in addition there is some aero heating of the airplane as
it travels through the air and different parts of the airplane will
experience different amounts of heating. Most turbine airplanes have a
chart that shows OAT guage error at different altitudes and airspeeds.

Mike
MU-2