Aircraft Trim - PabloRdrRbl/GNC_LAB GitHub Wiki
Pitch trim changes: https://aviation.stackexchange.com/questions/46999/what-exactly-is-trim
Out-of-trim condition: https://aviation.stackexchange.com/questions/26397/what-is-an-out-of-trim-condition-and-how-is-it-detected
A320 Trim https://aviation.stackexchange.com/questions/15268/how-does-trim-work-on-an-a320
More on autotrim https://aviation.stackexchange.com/questions/16927/how-does-auto-trim-work-on-fly-by-wire-aircraft