Hi, I’m flying the Cessna 172S with G530/430. I’m having trouble understanding why the autopilot instrument (KAP 140) isn’t in sync with my altimeter.
For instance I set my barometer steam gauge to 30.18 per ATC instructions. I then go to the autopilot press BARO button, then hold it down to get “in hg” readings and set that to 30.180.
I climb to 8,000 ft and ATC tells me I’m either 300 to 400 feet over my assigned altitude. I then have to change the autopilot to 7,700 to correct the problem. Can you help me understand how to properly set this instrument? Thank you.
Not sure if this bug post is related: