The interview is a management chat, trying to suss out if they can sit next to you for 12 hours. A couple of HR questions (give us a time when you have shown leadership, a time when you have dealt with an emergency situation etc) and a couple of tech questions - a couple of acronyms, what they mean etc and also detailed questions on one area (hydraulics in my case). Then a Q&A time and a bit about the job, where you can expect to be based etc. Overall straight forward and no messing unlike the BA interview process.