Topic summary
Ground spoiler
Extracted from the Wikipedia article Spoiler (aeronautics).
Ground spoilers
Ground spoilers, sometimes called lift dumpers informally, are a special type of spoiler designed to reduce wing lift on landing, differentiated from flight spoilers by having only two positions: deployed and retracted. The spoilers have three main functions: increasing the weight acting the landing gear for maximum braking effect, increasing form drag, and preventing aircraft "bounce" on landing.