Yes the locked toilets at Parafield are a disgrace. I along with others have been in contact with Adelaide AirRorts about these over the past year or so. They had some vandalism in the building so decided to lock them ...permanently. Some hangars have their own WC's of course other buildings do not. So in their wisdom they issued keys to those that didn't. No consideration was given to transient pilots and passengers. Pity help a female in urgent need after a couple of hour flight if you arrive after hours and the hangars are all closed . That is if they will let you use them. PF management have been asked to do what many country airports do and install a combination lock with a sign stating the combo is the CTAF,PAL, Area freq etc but there response it a flat no. No duty of care nothing.
They are happy to and insist in fact however, to charge you to land and park at PF while there.
May suggest if you find yourself in need to walk to their PF office in Tiger Moth Lane and ask to use theirs. If it is closed please feel free to relive yourself on their front door.
Tiger Moth Lane is only a short walk to the NW from the turnstile next to the Tower. You will need to use this exit anyway if you haven't got a gate swipe card as there is no other way out other than bolt cutters.
On behalf of Adelaideans I apologize for PF managements appalling managements attitude.