MTBF generally doesn't imply that the engine is either inoperable or completely failed. MTBCF, MTTF, or other metrics measure that. The MTBF for a military ai

MTBF generally doesn't imply that the engine is either inoperable or completely failed. MTBCF, MTTF, or other metrics measure that. The MTBF for a military aircraft as a whole system in general would likely be pretty low since it's composed of so many systems. In essence, something is likely degraded on the aircraft at any given time. That is why there are dual redundancies and easily swappable units.