I have a 2009 SR22TN. The POH says that High Boost/Prime will automatically shut off if the oil pressure is above 10psi (Section 7, page 40). But then in the Tornado Alley Supplement (pages 14, 15 & 17) it says to use High Boost/Prime above 18,000 feet under certain situations while the engine would be operating above 10psi (and thus not functioning).
This doesn’t seem to make sense. Does anyone have an explanation?