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Assuming the SFS software is good, try locating the OAT probe in the cowling
inlet lip. Won't get any hot air from anywhere else on the airplane up there
(until you go supersonic, that is ;-). Firewall pass-through makes this
problematic unless you've got some "growth" bulkhead connectors &
pass-throughs already built-in up front...

Best Regards,

Larry Graves
AirCrafters Builder Education Center
Construction, Maintenance & Repair
140 Aviation Way, Watsonville, CA
831-722-9141
www.AirCraftersLLC.com

----- Original Message -----
> 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.

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