mm43
Though the PNF called Alternate Law, there doesn't appear to have been any recognition of the different "flavors", or was there?
How could he know?
Bolding by me.
2.2.5 Aeroplane behaviour in reconfiguration laws
Alternate 2B law represents a specific case of flight control law reconfiguration. In fact, it occurs when the flight control computers have rejected the three ADR’s. It has the specific characteristic of being associated with the loss of computation and display of the limit speeds. The high and low speed protections that exist in normal law, and sometimes in a reduced manner (high and low speed stability) in alternate law, are lost.
There is however no explicit indication, apart from the red SPD LIM flag next to the speed tape (on the ECAM for example), of the level of alternate law that the aeroplane is in. The ECAM message associated with the reconfiguration to alternate law, of whatever type, indicates “PROT LOST”. However, not all of the protections are lost, since the load factor protection remains available, and reduced protections can also exist.
The precise identification of the consequences of a reconfiguration in alternate law is thus complicated.
In alternate 2 law, the longitudinal control law remains a load factor law and the lateral control law is a direct law. In the specific case of alternate 2B law, some coefficients used in the longitudinal flight control law become speed-independent and are set for the maximum speed for the aeroplane configuration (330 kt in clean configuration).
This hardly modifies the behaviour of the aeroplane in comparison to normal law, but can nevertheless induce an unusual response dynamic when the aeroplane has an abnormally low speed for the configuration.