Question: "If the hydraulic system fails in a transport category aircraft equipped with a Ram Air Turbine (RAT), when will the RAT deploy?"
A) The takeoff distance required will be greater than that calculated for standard conditions because of the combined effect of high pressure altitude and high temperature. B) The takeoff distance required will be less than that calculated for standard conditions because the low QNH increases engine thrust. C) The takeoff distance required remains unchanged because mass is the only factor affecting takeoff performance. D) The takeoff distance required will be reduced due to the high temperature reducing air density and thus reducing drag.
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High temperature and low QNH both reduce air density, increasing density altitude. Lower air density reduces engine thrust (for non-turbofan engines especially), lift, and propeller efficiency, increasing takeoff distance. Mass alone does not determine performance; environmental factors significantly affect it.
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