On the subject of how the flaperon may have become detached, I wonder if someone on this forum may be able to answer the question below.
When both engines and the APU are not operating, the ram air turbine (RAT) can provide hydraulic power to the center hydraulic system primary flight control components only. There is no power to extend flaps/slats.
The flaperons are primary flight control components, but only the right flaperon is powered by the center hydraulic system.
The position of the flight control surfaces is controlled by the Actuator Control Electronics (ACE) in response to signals from the pilot controls which include the control wheels and the flap lever.
Question: With engines and APU inoperative and the RAT providing hydraulic power, and the flap lever moved to the Flaps30 position, will the right flaperon move down to the Flaps30 position?