What are the three types of braking systems used in aircraft?

The correct answer identifies three essential braking systems utilized in aircraft: ground spoilers, disc brakes, and reverse thrusters.

Ground spoilers play a crucial role in augmenting an aircraft's braking performance. When deployed, spoilers disrupt airflow over the wings, thereby reducing lift and increasing the weight on the wheels, which enhances braking effectiveness during landing.

Disc brakes are commonly employed on aircraft due to their efficient heat dissipation and consistent braking performance. These brakes use a disc and caliper mechanism to provide reliable stopping power and have become a standard in modern aviation.

Reverse thrusters contribute significantly to deceleration during landing. By redirecting engine thrust forward, they help slow down the aircraft effectively after touchdown, complementing the other braking systems.

This combination of systems ensures that aircraft can achieve efficient, safe stopping distances on the runway, which is critical for flight safety. Options that include elements that don't directly apply to conventional aircraft braking systems, such as electric brakes or parachute brakes, do not represent the standard classifications typically regarded in aviation.