Pitot heaters are heavy current users, this means serious potential for magnetic interference. Best practice would be to run a twisted pair (pwr/grd) from the tube all the way to the switch and ground block and keep the wiring as far as practical away from the magnetometer, then keep your fingers crossed.
Walt Aronow, Dallas, TX (52F) RV7A, IO360, C/S, 1500+hrs
EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
Dynamic Prop Balancing, Pitot-Static Altmeter/Transponder Certification
FAA Certified Repair Station, AP/IA/FCC GROL, EAA Technical Counselor
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Last edited by Walt : 03-29-2017 at 05:19 PM.