Airspeed disagree

[zuluecho02]

Hi guys, i have a problem with the EFIS-D100 - the speeds do not agree with the steam gauge- on ground when stationary it shows 70km/h, and when airborne the speed difference is only (almost exactly) 20km/h more than the steam gauge. Any ideas? My mechanic tried checking the pitot tube-seems fine.

Thank you,
All the best
ZE

 

[Dynon]

You can try the zero pressure adjustment (covered in the installation manual). But if that doesn't fix it, we may need to take a look at it.

 

[zuluecho02]

On the ground it appears that your advice worked! Thank you. Let´s see if it shows ok in the air..

Thank you!