The airliners we have today are highly overpowered as they are designed to safely take off with one engine inoperative. The main factor that makes it harder for an airplane to lift off the ground is its weight. The higher the weight, the higher the engine thrust or power that is required for a takeoff. Thus, when the actual weight of the aircraft is lower than the regulatory or performance-limited takeoff weight, the aircraft requires less thrust to get airborne. This reduction in engine thrust is known as flexible takeoff or assumed temperature takeoff.
Read More Here: Why Do Airliners Takeoff With Reduced Thrust? | SimpleFlying.com
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