What's the logic of Airbus having Flight Control Laws?

Question

Airbus Fly by wire flight control computers follow this basic laws: Ground Laws, Flight Laws.It was never really discussed on us except that the 3 primary and 2 secondary computers follow this basic laws.

Enlightened me.

Answer 1

Flight control laws are the software algorithms that convert the pilot's inputs to the controls into commands to the aircraft's control surfaces to get the aircraft to achieve the commanded response.  For example, a pull aft on the control column to a certain position says the pilot wants the nose to rise at a certain rate, as in rotation for takeoff.  The flight control computer, using the set of flight control laws installed, commands the tail surface(elevator) to the nose up position.  Instruments in the aircraft then measure the rate of nose-up movement achieved and compare it to the pilot's command.  The computer then adjusts the position of the elevator, more up or down, to match performance achieved to performance commanded.  This is the feedback loop.

The beauty of having flight control laws established in software is that they are easy to manage and change.  For instance, when a new model of the same aircraft is made with a longer fuselage (stretch model). the pitch algorithm may have to change to compensate for the longer moment arm of the fuselage.