Dual D100 IAS

[dstclair]

I have dual D100s installed which are working fine except when taxiing. IAS for both D100s is typically 0 when I initially taxi to take-off. After landing and exiting the runway, one of the D100's will read '0' while the other reads in the low 20s. I know IAS is calibrated for accuracy above 15 and the indicator becomes active at 20 but it would seem to me they both should read the same within tolerance. Afer powering down, my next flight will start with both at 0.

Any ideas?

thanks,

dave

 

[dynonsupport]

There is a "zero airspeed" in the setup menu. Try zeroing the airspeed on both units and see if this fixes it. If not, you either have a plumbing problem (pitot or static) or an EFIS problem.