They basically want to see that you have an interest in moving to Hong Kong.
They ask the basics about the place like whats the population, main religion etc.
Know your aircaft that you are currently flying very well, for example whats the tire pressures, engine types, speed etc.
Most important thing to remember is to be yourself. Don't be cocky or arrogant. Give short answers as this will leave room for the interviewer to ask why after your answers. Don't leave any doubt in your answers either. If you get a questions wrong or don't know the answer don't stress, just simply say you don't know the answer.
Make your CV very presentable, have all your copies with and dress in a suit as this shows you are serious about the interview.
Best of luck and remember competition is stiff!!!