A crosswind landing happens when the wind blows across the runway instead of straight down it. The pilot must keep the aircraft tracking along the runway centerline while also preparing the wheels to touch down pointing straight ahead. This matters because landing with sideways drift or a sideways wheel angle can overload the landing gear and cause loss of control.
Good crosswind technique turns wind, heading, bank, and rudder control into one coordinated problem.
Two common methods are the crab technique and the wing-low sideslip technique. In a crab, the aircraft points its nose partly into the wind so its ground track stays aligned with the runway, then the pilot removes the crab just before touchdown using rudder. In a sideslip, the pilot lowers the upwind wing to stop sideways drift and uses opposite rudder to keep the nose aligned with the runway.
Many real landings combine both methods, with a crab on final approach followed by a transition to sideslip near touchdown.
Key Facts
- Crosswind component = wind speed × sin(angle between wind and runway)
- Headwind component = wind speed × cos(angle between wind and runway)
- Crab angle is the angle between the aircraft heading and its ground track.
- In a crab, heading points into the wind while ground track follows the runway centerline.
- In a sideslip, bank controls sideways drift and rudder controls nose alignment.
- Touchdown should occur with little or no sideways drift and the wheels aligned with the runway.
Vocabulary
- Crosswind component
- The part of the wind velocity that blows perpendicular to the runway and pushes the aircraft sideways.
- Crab angle
- The angle between where the aircraft nose points and the direction the aircraft actually moves over the ground.
- Sideslip
- A flight condition in which the aircraft is banked and uses opposite rudder so it moves slightly sideways through the air.
- Rudder
- The movable vertical tail surface that controls yaw and helps point the aircraft nose left or right.
- Runway centerline
- The marked line along the middle of the runway that pilots use as the desired ground track during landing.
Common Mistakes to Avoid
- Holding the crab all the way to touchdown, because the wheels may contact the runway while pointed at an angle and create a strong side load.
- Using aileron alone to align the nose, because ailerons mainly control bank and drift while the rudder controls yaw alignment.
- Using rudder alone to stop drift, because rudder can point the nose but does not provide the bank angle needed to counter sideways motion in a sideslip.
- Ignoring the actual wind angle, because a 20 knot wind is not a 20 knot crosswind unless it blows exactly perpendicular to the runway.
Practice Questions
- 1 A runway heading is 180 degrees and the wind is from 240 degrees at 20 knots. Calculate the crosswind component using crosswind component = wind speed × sin(angle).
- 2 A runway heading is 090 degrees and the wind is from 120 degrees at 16 knots. Calculate the headwind component using headwind component = wind speed × cos(angle).
- 3 An airplane on final approach is tracking the runway centerline but its nose is pointed 8 degrees into the wind. Explain whether this describes a crab or a sideslip, and describe what the pilot must do before touchdown.