What are the LEX spoilers and what is their function?

• A. They provide a high nose-down pitch during high AoA maneuvers.
• B. They deploy as a primary aileron after a certain speed.
• C. They act as a rear lift damper during turbulence.
• D. Provide speed brake when commanded by pilot at airspeeds less than 1.5.

Answer: (D)

LEX spoilers are lift-dumping panels built into the airplane’s leading edge extensions. Their job is to spoil lift and add drag, functioning as a speed brake to slow the aircraft and help stabilize it, especially at lower airspeeds. They’re commanded by the pilot through the speed brake control and are most effective when used at airspeeds below about 1.5 Mach. They’re not used for primary roll control or pitch control, nor do they act as a rear lift damper in turbulence.