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Home > Exam Questions > ATPL - Airline Transport Pilot Licence > Meteorology > A selected flight level has a pressure-altitude value at least as high as a published minimum safe altitude expressed in feet AMSL. Under which pressure and air-column conditions can its true altitude be expected to be no lower than that pressure-altitude value?

446 - ATPL Question Bank in English - A selected flight level has a pressure-altitude value at least as high as a published minimum safe altitude expressed in feet AMSL. Under which pressure and air-column conditions can its true altitude be expected to be no lower than that pressure-altitude value?

Question 446 - Meteorology - ATPL - Airline Transport Pilot Licence

At a temperature less than or equal to that of the ISA and where the QNH is less than 1013.25 hPa

In a cold low pressure region

In a very cold area with a QNH of 1015 hPa

QNH is at least 1013.25 hPa and the mean temperature of the relevant air column is at least ISA.

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