By DEFAULT FSX auto-pilot is enabled/disabled with keyboard keys. AutoPilot Enable/Disable (TOGGLE) key is the 'Z' key. Then you can Enable 'Alt Hold' with 'Alt+Z' key press (hold Alt down, then press Z key). Heading Hold keys are 'Alt+H' (press & hold Alt key then press H). Air Speed Hold (On/Off)='Alt+R' (might not work with Helios). Nav1 Hold (On/Off) is 'Alt+N' (might not work with Helios). Then when you want to go off autopilot you first press 'Alt+N', 'Alt+R', 'Alt+H', 'Alt+Z', and last (but not least) the 'Z' key and you are back to manual flying. Hope this helps. I know these keys work with airplanes, but maybe might not work with helicopters??? (haven't tried). Good luck.