Refer to figure.
Segments of the Take-off Climb

For a class A aircraft, one engine inoperative, the T/O climb is divided into 4 segments:

1. The take-off flight path starts once the take-off is complete, at 35 ft with the airplane at V₂ with one engine inoperative. On a wet runway, the screen height is reduced to 15'. Operating engines are at takeoff thrust, the flaps/slats are in takeoff configuration and landing gear retraction is initiated once safely airborne with positive climb. The first segment ends when the landing gear is fully retracted.
2. Begins when the landing gear is fully retracted. Engines are at takeoff thrust and the flaps/slats are in the takeoff configuration. This segment ends at the higher of 400'.
3. Begins at 400' or higher specified acceleration altitude. Engines are at takeoff thrust and the aircraft is accelerated in level flight. Slats/flaps are retracted on speed. The segment ends when aircraft is in clean configuration and the final take-off speed has been achieved. Once this has happened, thrust can be reduced from maximum take-off thrust, TOGA, to maximum continuous thrust, MCT.
4. Starts when the flaps are retracted, the final segment speed is achieved, and the thrust is set to maximum continuous thrust. From this point the airplane is climbed to above 1500 ft where the take-off flight path ends. The climb gradient for this last stage must not be less than 1.2%.