I have a 1981 M20K with KFC 200 Silver package.
My HSI started swing 30 degrees off from magnetic when slave to the remote flux compass. This started after my annual. It never had issues before. A recent trip had the HSA alternately working on some legs and consistently off on the other legs by 30 degrees.
Any thoughts on what could be causing this?
Where is the flux compass in this make and model located in the plane?