Jailed pending a trial is pretty harsh. Of course I can't speak for Norway, but it's usually reserved for suspects that pose a flight risk (Not that kind of flight. The fleeing kind.)
In my part of the world, it's done for some dumb redneck driver who is likely just going to jump back in his car after booking at the police station. But an administrative order of some sort to hand over one's pilots license and a word to the employer should pretty much keep one grounded. I would hope.