This is highly unusual, so there may be something more to it than only speculation about radiation. The emergency AD says: > Before next flight after the effec

This is highly unusual, so there may be something more to it than only speculation about radiation. The emergency AD says: > Before next flight after the effective date of this AD, replace or modify each affected ELAC with a serviceable ELAC in accordance with the instructions of the AOT. > > A ferry flight (up to 3 Flight Cycles, non-ETOPS, no passengers) is permitted to position the aeroplane to a location where the replacement or modification can be accomplished. That's a very limiting AD. The "before the next flight" part is unusual, ADs often have a limit to the next inspection or X flight hours or similar, not immediately.