Definition
A takeoff performed when the wind has a component blowing across the runway rather than directly down it. The pilot uses aileron deflection into the wind and rudder as needed to keep the airplane tracking straight along the runway centerline during the takeoff roll, then transitions to a wind-correction angle (crab) after liftoff to maintain the desired ground track.
Plain English
A takeoff where the wind is blowing partly from the side, so the pilot has to use the controls to stop the airplane drifting sideways or weathervaning into the wind while accelerating down the runway.
Context Anchor
Encountered during takeoff training, especially when the reported wind is not aligned with the runway being used.
Derivation
Crosswind' simply means wind crossing the runway rather than aligned with it. The aviation term is descriptive: the wind cuts across the takeoff path, so the technique has to compensate for it.
Why Pilots Care
Improper handling can cause the airplane to weathervane into the wind or drift off the runway edge, risking loss of control or runway excursion.
Grounding Statement
Picture the airplane accelerating down the runway while the wind pushes from one side; the pilot’s job is to keep it moving straight ahead despite that sideways push.
Intuition Check
A crosswind takeoff is not just a takeoff on a windy day. The key point is that the wind is coming from the side of the runway, so the airplane needs sideways-drift correction as it accelerates and lifts off.
Example Sentence 1
With a steady wind from the left, the student held full left aileron at the start of the crosswind takeoff and gradually reduced it as the airplane accelerated.
Example Sentence 2
After liftoff the pilot transitioned from a crab into a sideslip to align the fuselage with the runway while continuing the climb in the crosswind.