One-dimensional vs. two-dimensional inputs on the flight controls?
I’m just analyzing sidestick inputs from a flight simulator study with manual flying (raw data). On Airbus aircraft you can either do one-dimensional/separate or two-dimensional/combined inputs on the two-dimensional sidestick.
Some flight trainers say that a pilot should separate the inputs on both axes, doing only one-dimensional inputs, i.e. pitch or roll inputs, but not at the same time. One possible reason for separating both axes might be a higher control accuracy when manipulation one axis only.
I’m looking for documents, reasons, literature for or against this practice. Does anyone know such documents or know some reasons for or against the separation of axes?