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Maximum takeoff (MTO) thrust is the highest amount of thrust an aricraft is allowed to give in the first 5 minutes of takeoff and flight. It is used when an aircraft has a heavy payload and only a small runway for takeoff. This causes a lot of engine wear, so most of the time aricraft calculate the minimim thrust needed for an efficient takeoff, and use that instead. Take off thrust can very between the minimum and maximum level depending on the conditions.