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Gentlemen,

I have a SFS system EFIS in a IVP which is experiencing errors in OAT
readings.  The reading at FL 220 was about 34 F when  really it was probably
some 30 - 40 degrees cooler than that.

Having said this, the OAT reading on the ground seems normal.   The OAT probe
is located below the middle of the co-pilots window and it has been suggested
that heat from the engine may be blowing back to create a tunnel of hotter
than ambient air as a result.

One note:  We just upgraded to the latest release of Sierra Flight Systems
software which was supposed to have been a bug fix release.

Any ideas??

Dave Riggs
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