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.

 

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

 Actuator Configuration