Just a personal curiosity to wake up this old thread.
In case of total hyd loss, do flight surfaces lock in place or they will freefloat into wind?
As far as I know, being a FBW (irreversible) flight control system, they are not mass-balanced. In that case, they might be prone to flutter.. just asking, don't know.
Are irreversible desgined if there is no hyd pressure the surface would be locked?