Definition
A forward slip is an intentional cross-control maneuver in which the airplane's longitudinal axis is angled away from the original flightpath while the airplane continues along that same ground track. It is produced by lowering one wing with aileron and applying opposite rudder to prevent the nose from turning, which increases drag and steepens the descent angle without increasing airspeed. The forward slip is most commonly used to lose altitude on final approach when the airplane is too high, allowing the pilot to descend more steeply while keeping the original ground track and approach path to the runway.
Plain English
A way of flying down a steeper path without speeding up. The pilot drops one wing and pushes the opposite rudder pedal so the airplane keeps heading toward the runway but slides through the air sideways, which creates extra drag and lets it come down faster.
Context Anchor
Most often encountered on approach to landing, especially when the airplane is too high and the pilot needs to descend more steeply without gaining much speed.
Derivation
Called 'forward' because the airplane continues forward along its original ground track toward the runway, even though the nose is pointed off to one side. This distinguishes it from a sideslip, where the ground track itself is shifted sideways.
Why Pilots Care
Enables pilots to lose altitude rapidly on approach without exceeding maximum flap or gear extension speeds, improving safety on short or obstructed runways.
Grounding Statement
Picture the airplane still moving toward the runway, but slightly sideways to the airflow, so the extra drag helps it descend more steeply.
Intuition Check
A forward slip is not an accidental loss of control and it is not the same as simply turning toward the runway. It is an intentional, cross-controlled descent technique used to lose altitude while keeping the airplane’s path under control.
Example Sentence 1
Realizing she was high on final, the pilot lowered the left wing, applied right rudder, and entered a forward slip to lose the extra altitude before the runway threshold.
Example Sentence 2
Forward slips are often used in tailwheel aircraft training to maintain directional control during crosswind landings.