in Airbus A320

Smart Exit Alpha Floor (Reversible Alpha Floor)

The alpha floor protection is designed to prevent the aircraft from stalling by automatically commanding TOGA thrust when the angle of attack (AOA) reaches a certain threshold. This TOGA thrust remains engaged (TOGA LK message on FMA) even after recover from high angle of attack state. In order to recover normal thrust operations, flight crew must manually disengage the auto-thrust (ATHR). This sometimes increase the crew workload in critical phase of flight.

With Reversible Alpha Floor, the need for flight crew to manually disengage the ATHR is eliminated. The ATHR system goes back to its previous state, either Speed Mode or the thrust mode it was in before entering the alpha floor conditions. Additionally, the TOGA LK message disappears. This ensures that once the aircraft is back in a safe flying situation, the systems revert to their regular operating states.

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