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Date: Fri, 28 Nov 2008 15:25:02 -0500
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Subject: RE: [LML] Re: 360s at high altitudes
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Yup, it is more complicated than just a simple layer some days - thus my
admonition to get a COMPLETE weather briefing.

I thought it was important to say it because some in our crowd DON'T have
the background of flying in known icing aircraft, or in aircraft where when
you are picking up a little ice you just light the burners and climb...

The big thing is not to get lulled into thinking icing happens at a
particular altitude.  That will get you in a world of hurt if you suddenly
fly in different weather.

Happy Thanksgiving All!

Bill


Bill this is usually true, until you have an inversion [warm air aloft]..
I've done the same trip you mention, hit the clouds and loaded up real
fast.. I fly a known ice a/c so it wasn't a big deal [it was also forecast]
but if your not expecting it.. It would have made for a fun 'return to
departure airport' proceedure, if one couldn't climb out of it or through it
quickly.  Ice will also sublimate off the airframe once in the clear.. it's
amazing to watch it disappear while flying in below freezing conditions..
as long as you can get out of it quickly or are able to fly in it and remove
it faster than it's accumulating, you should be ok..

FWIW

Jarrett Johnson
235/320 55%

-----Original Message-----
From: H & J Johnson [mailto:hjjohnson@sasktel.net] 
Sent: Wednesday, November 26, 2008 19:02
To: lml@lancaironline.net
Subject: Re: [LML] Re: 360s at high altitudes

> Lorn,
> 
> Just a comment about your icing comment - the altitude at which you 
> fly is not really the issue, it is the temperature.  Once the 
> temperature is more than approximately 20 degrees below freezing, 
> icing is not generally an issue.
> 
> Thus, in the South in summertime you might fly at 17,500' and still be 
> below icing levels, while in the North in wintertime you may already 
> be aboveicing levels at takeoff (hope your heater is working well and 
> you have sealed all those pesky air leaks!).  I have taken off in 
> Northern Indiana on a solidly overcast day when the surface 
> temperature was 20 degrees and the ceiling was at 5,000' with no fear 
> whatever of icing.  Punched out at 10,000' into beautiful (but cold!) 
> air with not a hint of ice anywhere.
> Conditions may vary!  Always be sure to get a COMPLETE weather 
> briefingbefore flying into any visible moisture!
> 
> Cheers,
> 
> Bill