Altimeter error

[slipstream]

Recently, I've noticed that my D100 began reading about 100' above field elevation when the altimeter is set properly. Aside from that error, everything else about the pitot/static system works fine. Is this likely to be an opening in the static line, or just something I should tweak within the setup --> altadj page?

 

[Dynon]

Water in your static line could be pulling a slight vacuum on the EFIS side of a blockage, so popping the static line off, if this an abrupt new change, wouldn't hurt. If you find that there's nothing there, you can use ALTADJ to fix that, but make sure that you've let your D100 sit for 10 minutes or so to stabilize after initial power on before you do that.

 

[flyingtodd47]

My altitude on the ground is 64' off. Sitting on the ground and having never been flown.
I don't see a way to set the reading, I've set the baro to atis.

 

[Dynon]

All of our products have a way to adjust the base altitude calibration, which should be done after the system has been on to allow everything to stabilize. In our D10/D100 series, it's under SETUP > ALTADJ, and for SkyView, it's under SETUP MENU > HARDWARE CALIBRATION > ADAHRS CALIBRATION > ALTITUDE ADJUST.