Ground spoilers aid in _____ during rejected takeoffs and landings.

Ground spoilers play a critical role in enhancing a flight's safety and performance during both rejected takeoffs and landings by assisting in deceleration. When deployed, these devices extend into the airflow above the wings, effectively disrupting lift. This reduction in lift allows the aircraft to settle onto the runway more firmly, increasing the weight on the wheels, which significantly improves the friction between the tires and the runway surface. Consequently, this makes it easier for the aircraft to decelerate efficiently.

Utilizing ground spoilers is a fundamental aspect of an aircraft's braking system, as it allows for quicker slowing down and helps reduce the distance required to bring the aircraft to a complete stop. This function is particularly crucial during rejected takeoffs or when landing, where rapid deceleration may be necessary to ensure safe ground handling.