System comprising two combined instruments mounted on board an aircraft and method implementing the system

A method of determining flight parameters of an aircraft on a system, the system comprising:

• two integrated electronics instruments mounted onboard an aircraft;
• a communication link between the two integrated electronics instruments, each integrated electronics instrument comprising:
• one or more inertial sensors to sense flight parameters, wherein said flight parameters include at least one of flight, speed, altitude and attitude parameters;
• one or more anemobarometric sensors to sense said flight parameters;
• and
• one or more displays displaying either flight parameters or navigation parameters of the aircraft,
• wherein the method comprises the steps of:
• selecting from the inertial sensors or the anemobarometric sensors of the two integrated electronics instruments, one or more sensors to determine the flight parameters according to their availability, to produce determined flight parameters;
• and
• displaying the determined flight parameters on the display of any one or both of the integrated electronics instruments.