Axes Convention

All signs in the system are managed according to the international aeronautical axes convention: It is considered positive any deflection that generates positive rotational forces or moments about the aerodynamic centre of the aircraft, except for “y” axis (elevator) where it is considered negative a positive moment.

System Overview - Sign Convention

Sign Convention

Example, an elevator down position will generate a positive pitch so the elevator is considered positive on down position. Main actuators rules:

Actuator

Positive

Negative

Elevator

Down

Up

Rudder

Right

Left

Right Aileron

Up

Down

Left Aileron

Down

Up

Tail Rotor

Right

Left