Re auto trim in Alternate Law; some confusion?
If Abnormal Attitude Law (*) is triggered by an upset, Pitch, Roll, etc, as defined on page 79 of the report (#3570) then auto trim is frozen at the value existing at change over.
* This is Pitch Alternate with load factor protection, but without auto trim (#3574).
However, if the aircraft ‘recovers’ from the upset condition (Abnormal Attitude no longer valid, but note overriding AoA range, and that the aircraft could still be in a stalled condition), then the auto trim might be available.
The description of system behaviour in #3574 indicates that auto trim is recovered after the ‘condition’ (presumed to be the upset condition) is exited, but is unclear (and probably irrelevant in this instance if Normal Law would be reinstated) which law, Alternate or Attitude is retained.
In this accident would a power interruption as suggested in the report trigger Alternate Law with auto trim?
Or alternatively, and /or during the event after power interrupt, would the Abnormal Attitude Law be triggered
and if so, which ‘law’ has priority, i.e. could a power interrupt inhibit a subsequent tigger point?
And could auto trim be reinstated later in the event, yet still in Alternate Law?