mm43;
Doh!...my expanded abnormals indicated the following:
NAV ADR DISAGREE
F/CTL ALTN LAW (PROT LOST)
Note: Following an ADR DISAGREE, detected by the PRIMs, ALTN law is latched. Resetting the PRIMs by using the pushbutton does not allow normal law recovery.
The latching only after 10 second was the feature introduced after 1997. I drew the conclusion from this and from another document which discussed the 1997 change, that both ALTN 1 and 2 latched. I've checked with my FCTMs as well and they agree with your comment that only ALTN 2 is latched. Thanks for the correction.
Interestingly, the following comment is offered in the CP FCTM:
Handling Characteristics
In pitch, handling remains similar to normal law.
In roll, depending on the failure level, control is either normal (ALTN 1) or direct (ALTN 2). In roll direct, the aircraft appears to be very sensitive and bank stability is no longer active.