Any time air is accelerated, as it is when passing over a small-radius
surface, its temperature drops...so it is entirely possible to accrete ice
when the temp is above zero. That's why you look at those surfaces
first...OAT guage, struts, lower edge of windscreen where there is a lip
rather than a flush surface, etc. That is also why tail feathers begin to
accrete ice before the wing's leading edge does.

Bob Gardner

"Dave" wrote in message
ink.net...
I'd like to know how you get in icing when the temperature is +5. I have
never seen ice until the the gauge reads 0 or below.




"ArtP" wrote in message
...
On 26 Jan 2004 10:08:44 -0800, (Andrew
Sarangan) wrote:

For example, right now the freezing level is at 5000 ft,
MEA is at 2500 ft, yet we have an airmet Z that goes all way from SFC
to 18k.

Since the published icing conditions occur from +5 to -20 C, a
freezing level at 5000 would mean icing potentially below 3000 feet.
The MEA may be 2500 but the normal minimum IFR altitudes would be
either 3000 or 4000 feet depending on direction and that is known
icing conditions. I am sorry this frustrates you but depending on
where you live a big chunk of winter is off limits to small GA
aircraft trying to fly IFR.