Minor nitpick, but > The single one controller was then informed during the update taking place what was still functioning and not which was very little. Acco

Minor nitpick, but > The single one controller was then informed during the update taking place what was still functioning and not which was very little. According to the text you quoted, it's worse: > But Nielsen had no idea what features would be lost in fallback mode, nor did he have any obvious way of finding out. Nielsen never knew which systems were out of order. Given the apparent workload he was under, knowing that the collision warning was out of order probably would not have helped, but it seems that he didn't even know for sure that the system was down.