ckb

Thanks for everyone's input. As a follow up, I ended up buying a manometer and followed the adjustment instructions in the manual. This corrected the pitch trim indicator (the lines now line up in level flight) and minimized the need to retrim when the pitch valve is engaged. You could probably use trial and error, turn the centering adjustment screw and see what happens... But following the Brittain instructions seems like the way to go... shocking. I now need to figure out why the altitude hold doesnt work. Ive tested for leaks to the alt hold chamber and there were none. So Im thinking the issue might be in the altitude hold sensor.

I am a new owner of a 1966 M20E. In 2004, the previous owner had the Brittain pitch control system installed. I am interested in adjusting it so that in level flight when the pitch valve is pulled the pitch indicator lines remain aligned thus requiring minimal trim adjustment to maintain level flight. At the moment, when I pull the pitch value the left line drops below and the plane descends aggressively. I can trim the plane for level flight. With this background I have three questions. 1. Does the centering adjustment at the top of the pitch/altitude sensor assembly enable one to get the pitch trim indicator lines to align in level flight? 2. If so, what is the easiest way to adjust? According to the manual you connect a manometer to the pitch/altitude sensor and adjust so there is zero differential between the blue and yellow output ports. Silly question, but the plane must be running right? 3. Is there a way to adjust it without a manometer? I read on Mooneyspace you can sort of wing it and a clockwise turn causes an upward pitch movement and a counterclockwise will cause a downward pitch movement. Is this correct? if so, anyone know the effect of one turn? Any insight is super helpful! Thanks