The bus simulated an aircraft that had crashed due to difficulties at take-off, with one of the wings detached and a fire having started, he said.
Mr Harrison said volunteers were "from all over the place", including volunteer firefighters, John Paul College students and teachers and people from the Rotorua Lakes Council who had an interest in emergency management.
He said it went well, though there were always points to take away and improve.
"They all turned out, did what they needed to do and co-ordinated well with each other."
Mr Harrison said the airport fire service was first to respond to aid in self-evacuation.
The New Zealand Fire Service went into the aircraft to rescue those who could not
evacuate themselves and St John triaged all the people, referring them to suitable medical treatment or the temporary welfare centre, he said.
The police secured the airport to keep people away who shouldn't be there.
Mr Harrison said when the site had been declared safe police had overarching responsibility.
The emergency exercise was part of Civil Aviation Authority (CAA) requirements and an exercise was to take place every two years, he said.