Definition
The portion of a flight that begins when the pilot applies takeoff power for the takeoff roll and ends when the airplane has accelerated through liftoff, established a positive rate of climb, and reached a safe maneuvering altitude clear of obstacles. It includes the ground roll, rotation, liftoff, and initial climb segment.
Plain English
The part of the flight from the start of the takeoff roll on the runway through liftoff and the early climb, until the airplane is safely climbing away at a comfortable height above the ground.
Context Anchor
Seen in performance and ground-effect discussions, especially when explaining how the airplane behaves just before and just after leaving the runway.
Derivation
Takeoff combines “take” and “off,” meaning to leave a surface. Phase comes from older Greek and Latin roots meaning an appearance or stage, which helps here because a phase of flight is one stage in the whole flight from start to finish.
Why Pilots Care
Takeoff performance directly determines runway length required and obstacle clearance margins; misunderstanding the phase boundaries can lead to unsafe climb decisions.
Grounding Statement
Picture the airplane accelerating along the runway, lifting off, and climbing away while still close to the ground.
Intuition Check
Do not think of “takeoff phase of flight” as only the instant the wheels leave the runway. In this context, it covers the whole early stage: the roll, liftoff, and the first climb away.
Example Sentence 1
During the takeoff phase of flight, the pilot stayed focused on airspeed and runway alignment until the airplane was climbing steadily away from the runway.
Example Sentence 2
Ground effect provides extra lift during the takeoff phase of flight when the airplane is near the surface.