Quote from wmelvin:
Does the GA mode also command a flight path? If so, can it use elevator trim to accomplish this?
Haven't been following this thread for some days, so have a lot of catching up to do. But, in case it helps, I think you are referring to an AP/FD function, not an FBW function. On a normal go-around, when the FD is available or already selected, the FD mode changes to "SRS" (speed reference system) as soon as the pilot selects TOGA thrust. (This is announced to both pilots by the FMA-indicators at the top of their PFDs, which show "TOGA/SRS/GA TRK".) SRS uses pitch commands to achieve the IAS appropriate to the configuration. When either the PF (using sidestick) or the AP respond to the pitch commands, the FBW system will control elevator, backed up by autotrim, as required.
Guess I don't have to remind you that the FDs/APs were no longer available on AF447 at the stage when the PF selected TOGA.