Which computers are responsible for the operation of the primary flight controls?

The correct answer identifies the computers responsible for the operation of the primary flight controls as two Elevator and Aileron Computers (ELACs) and three Spoiler Electronic Control Units (SECs).

In the A320 aircraft, ELACs manage the control laws for the elevators and ailerons, which are crucial for aircraft maneuvering and stability. They process inputs from the flight control levers and pilot commands to actuate these primary control surfaces effectively.

The SECs are responsible for managing the spoilers, which not only help in roll control but also function as lift dump devices during landing. Having three SECs provides redundancy and ensures that the aircraft can still maintain safe operations even if one unit experiences a failure.

This combination of two ELACs and three SECs creates a well-rounded system that enhances the safety and reliability of the flight control operations. Understanding the roles of each component is essential for comprehending how the A320 manages its flight controls and ensures effective piloting.