The UK’s Air Accidents Investigation Branch reported last week that the cause of the March 16 accident in which an Airbus Helicopters EC135T2i crashed into a busy pub in Glasgow is still unknown. “[The] investigation to date has not identified any technical malfunction that might account for the accident. The investigation continues, with the aim of identifying any technical matters of relevance, as well as focusing on flight in degraded visual environments,” said the AAIB.