Mean Time Between Unscheduled Removal (MTBUR) is an important metric used in the aviation industry. It is calculated by taking the total flight hours of a fleet and dividing that number by the unscheduled removals of any component. This measurement helps assess operational efficiency. If every removal was due to a genuine component failure, MTBUR would equal Mean Time Between Failure (MTBF). However, this is rarely the case, so MTBUR typically falls short of MTBF. Overall, it serves as a useful indicator for categories like General and Airworthiness.
