Definition
The phase of flight that begins with the application of takeoff power on the runway and ends when the airplane has climbed to a safe altitude and transitioned into the en route or cruise climb. It includes the takeoff roll, lift-off, initial climb, and any prescribed departure procedure used to leave the airport area.
Plain English
Getting the airplane off the ground and safely climbing away from the airport. It covers the roll down the runway, lifting off, and the climb until you are clear of the airport environment.
Context Anchor
Seen in flight training when discussing slow flight, stalls, takeoff practice, and the first climb after leaving the runway.
Derivation
Takeoff comes from the idea of an aircraft lifting off the ground. Departure comes from an older word meaning to go away or leave. In aviation, the two together point to both leaving the runway and beginning the flight path away from the airport.
Why Pilots Care
This phase involves high workload and proximity to stall speeds; unresolved confusion here increases risk of loss of control or runway incidents.
Intuition Check
Do not read departure as simply “leaving” in the casual sense. Here it means the controlled climb and path away from the runway after the airplane becomes airborne.
Example Sentence 1
During takeoff/departure, the pilot maintained the recommended pitch attitude to achieve the best rate of climb.
Example Sentence 2
Slow flight practice helps pilots stay proficient when handling the takeoff/departure in varying wind conditions.