Originally Posted by BeatNavy

Most of the fume events aren’t a constant dirty sock smell. It seems to happen most at TOD but is never really a constant smell and comes about at various phases of flight. If it was dirty pack filters, it would be constant as long as air went thru the packs, IE as soon as the APU provides bleed air to the packs at the gate. If it smelled like dirty socks at the gate with the APU bleed on as soon as you get on the plane it should be written up and you should get off the plane until it’s fixed. If the smell comes at some later time, then it’s clearly not mold/dirty filters, as that would have been there earlier. So no, these fumes aren’t from moldy socks/filters.