The other day I let Otto (aka a TruTrak DigiFlight II VSGV) fly the plane because I was deep into my setting menus on the GRT, and Otto let the plane descend 250 feet. I went to pull the stick back and Otto was fighting me!
Called TruTrak and learned this: When you just push the button on the AP it is not altitude hold mode. It is in vertical speed hold mode. Even though the display says "ALT HOLD". This vertical speed mode is based on the air sensors, so if the mass of air you are in goes up or down so does the plane. To put the AP in true altitude hold you have to push the ALT button twice.
Hans
Called TruTrak and learned this: When you just push the button on the AP it is not altitude hold mode. It is in vertical speed hold mode. Even though the display says "ALT HOLD". This vertical speed mode is based on the air sensors, so if the mass of air you are in goes up or down so does the plane. To put the AP in true altitude hold you have to push the ALT button twice.
Hans