Abstract: Disclosed is a pilot aircraft system control input arrangement for a light aircraft having primary flight controls, the pilot aircraft system control input arrangement integrated into an armrest for a pilot's seat, the armrest providing forearm support for a pilot and having integrated therein or associated therewith a primary flight control and wherein the pilot aircraft system control input arrangement is disposed to be reached by fingers of a pilot with their forearm resting on the armrest, the pilot system control input arrangement comprising: a numerical keypad interface for inputting data; a rotatable selector for inputting data; a function selector operable to switch the pilot input arrangement between at least two input functions that each enable the pilot input arrangement to receive a different type of input, wherein the types of input for the at least two input functions are selected from at least two of the following input categories: a pressure setting for an altimeter; a transponder code for a t