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Seems like an engine monitoring program isn't very difficult to put together. Don't see why this would prohibit other SE 135 airplanes from being able to operate.Originally Posted by PerfInit
Cirrus SR-22 is the only Recip powered SE 135 IFR exception that I am aware of, due to the fact that they have an approved engine monitoring program that meets the regulatory requirement. See 14 CFR Part 135, Section 135.421(c).