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OK, looks like you have the easy part (alt) sorted. How do you plan on using the system. Completely autonomous flight, assisted flight (ie: the sensors in the plane must limit the turn radius and pitch angle to a set safety limit?).
I still don't think you will get anything usable from just the acellerometer alone. If you have a plane with very high dihedral you might get away with only using a gyro on the ussumption that the plane is level if no rudder/ail input is sent to the plane.
Have a look here: **broken link removed**