Hello,

I have a D6 EFIS in our Lancair as a backup unit and it's airspeed always matched that of the Garmin EFIS.  However, after not flying it for a couple months over the winter (but being stored in a heated hangar), I now notice that the airspeed displayed on the D6 is 30kts higher than that of the Garmin.  I know the Garmin is correct.  We have only 1 pitot tube on the plane and it supplies both the Garmin and Dynon units for airspeed.

Can anyone suggest where I can begin to look?  I would think it if was a leek in the hose, that we'd see an equal issue with the Garmin unit.

Thanks,

Dico