Both sentences actually. Recent studies of airframe icing have not been
able to produce icing above 0C. (Sorry I don't have a reference). If the
static air temperature is above 0C then the water isn't supercooled, so even
if the airplane is at or slightly below freezing you won't get ice. The
wing's leading edge experiences a temperature increase, not a decrease.

I suppose that it is possible to locate the temp probe in an area with a ram
temperature rise greater than the wing. In that case, it is possible for
the temp guage to read above 0C but still have the static air temperature
and portions of the airplane below 0C. That would lead to icing but it is
an instrument error not icing above 0C.

Mike
MU-2


"Peter R." wrote in message
...
Mike Rapoport ) wrote:

You can't unless your thermometer is wrong.

Are you replying to Dave's first sentence, which is:

I'd like to know how you get in icing when the temperature is +5.

Or his second:

I have never seen ice until the the gauge reads 0 or below.

Or both?

If you are replying to his second sentence, this is contradictory to my
understanding that the temperature right at the leading edge of an airfoil
could be up to a few degrees colder than the surrounding air, which is why
I learned that airframe icing (excluding freezing rain) can occur in air
temperatures above freezing.

I should point out here that I am simply seeking clarification of your
comment, not challenging it (as I look to you as one of the more
experienced in these groups).

--
Peter












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