Which of the following statements about the TAD takeoff preset is true?

• A. They change with every change in weight on wheels
• B. They change after 40 KIAS
• C. They remain constant until 80 KIAS and weight off wheels
• D. They remain constant forever

Answer: (C)

Takeoff trim presets are fixed values loaded on the ground based on the aircraft’s weight and center of gravity, and they are applied to provide a stable rotation and pitch feel during the takeoff roll. They are held constant through the takeoff until you reach about 80 knots indicated airspeed and weight is off wheels. At that point, the flight controls transition to climb trim or a different trim schedule suitable for flight, so the preset isn’t used forever. This is why the true statement is that they remain constant until 80 KIAS and weight off wheels. They don’t change with every change in weight on wheels, they don’t change specifically after 40 KIAS, and they don’t stay constant forever.