Takeoff/Go-around Switches - Takeoff

Takeoff

Once an aircraft has lined up, the pilots increase the engine power. The level reached is 40-60% RPM of Low Pressure Turbine on Boeings, and 50% on Airbuses. This is done to prevent flame-out on takeoff due to compressor stall. The pilots then press the TO/GA switch, by pushing the thrust levers to TOGA on Boeings or to FLEX on Airbuses, and the engines then increase to their computed take off power. Modern aircraft flight management computers will determine the power needed by the engines to take off, based on a number of factors such as runway length, wind speed, temperature, and most importantly the weight of the aircraft. In older aircraft these calculations were performed by the pilots before a takeoff. The advantage of having such a system is the ability to reduce wear and tear on the engines by only using as much power as is actually required to ensure the aircraft reaches a safe take off speed.

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