Well, it all rather depends on what "job" we are talking about, Flip. The only job that a BoI has is to determine is, if possible, the likely cause of an accident with the prime intention being to avoid possible recurrences. If, like me, they happened to believe that the grossly unairworthy state of the aircraft was a major contributing factor if not the primary cause of this accident, then the complete cycle of cause and effect will have been demonstrated. Scene: AM's office in Main Building, with entire IPT and him filling it. Script: "Ignore the Airworthiness Regulations, we can't afford the time and money that observance of them will cost, but sign them off as complied with anyway". Closing Scene: Wreckage scattered hillside where 29 people have lost their lives unnecessarily. I don't see a judge or a jury being able to demonstrate cause and effect as authoritatively as a professionally run accident investigation would. Of course they would then be involved in the subsequent legal cases and the BoI evidence and witnesses would no doubt be called upon as well. In other words a question of carts and horses?