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Mean Time Between Unscheduled Removal (MTBUR)

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Category: Airworthiness Airworthiness
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This is an operational measurement. If all removals were because of actual component failure then MTBUR would be equivalent to Mean Time Between Failure (MTBF), but that is not usually the case and so Mean Time Between Unscheduled Removal (MTBUR) is usually less than Mean Time Between Failure (MTBF).

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