If both ELACs fail, pitch control transfers to which units?

When both Elevator Aileron Computers (ELACs) fail on an Airbus A320, pitch control is taken over by the Spoiler Elevon Computer (SEC). The SECs are designed to manage control in the event of ELAC failure and are responsible for controlling pitch through the use of the elevators and can provide additional control for the airplane's stability.

This functionality is crucial for maintaining control authority in various phases of flight, particularly during critical situations such as takeoff or landing, where precise control of the aircraft’s pitch is essential. The SECs also provide data to the flight control law by determining the necessary inputs to stabilize the aircraft and ensure safe operation.

The other options do not take over pitch control in this situation. Flight Augmentation Computers (FACs) are primarily responsible for managing the flight envelope, while the Slat/Flap Control Computers (SFCCs) manage the positions of slats and flaps but do not handle pitch control. BSCUs (Brake and Steering Control Units) manage braking and steering functions and are not involved with flight control systems. Therefore, in the event of ELAC failure, pitch control effectively transitions to the SECs to maintain flight operations.