When autobrakes are set to 3 during landing and reverse thrust is applied, what does the autobrake system do?

• A. Provides constant deceleration by varying braking force
• B. Locks braking until stop
• C. Separates braking from reversers
• D. Disengages braking function

Answer: (A)

Autobrake is designed to deliver a controlled, predetermined deceleration after touchdown. When you set it to a level, the system automatically applies braking and continuously modulates brake pressure to keep the aircraft slowing at a constant rate, as defined by that level. If reverse thrust is used during rollout, the reversers contribute to deceleration, while the autobrake adjusts brake pressure to maintain the target deceleration. It does not lock the brakes, does not separate braking from reversers, and does not disengage braking.