Originally Posted by konde landi
3-) Aircraft start descending between Alpha Prot and Alpha Max.
4-) ...
5-) Alpha floor is not activated, as it is inhibited above M 0.53 for the A330.
Re (3): Would it not maintain Alpha Prot?
EDIT:: At Alpha Prot the flight control law changes from an Nz command law to an alpha command law. The commanded alpha is Alpha Prot for sidestick neutral, and Alpha Max for sidestick fully back. Alpha floor is not activated because the alpha threshold for its activation is not reached. At some point in the descent to the single-engine ceiling with AoA=Alpha Prot the speed may drop below M 0.53 .