What are the functions of the multi-function spoilers?

What are the functions of the multi-function spoilers?

• A. GLD, roll assist, flight spoilers
• B. Ground spoilers only
• C. Aileron control
• D. Stabilizer trim

Answer: (A)

Multi-function spoilers are wing surfaces that can disrupt airflow to control lift in different flight phases. They perform three roles: as flight spoilers, they reduce lift to help descent, speed control, or pitching moments without relying solely on elevators; as roll assist, they work with the ailerons to enhance lateral control by producing differential lift across the wings; and as ground spoilers, they deploy after touchdown to dump lift off the wings, increasing wheel load and braking effectiveness. GLD, standing for Ground Lift Dump, is specifically the lift-dumping function used on landing, which is why this option captures the full set of capabilities. The other choices miss one or more of these roles: spoilers aren’t limited to ground use, they aren’t the primary means of aileron control, and stabilizer trim changes pitch rather than altering wing lift in flight.

Multi-function spoilers are wing surfaces that can disrupt airflow to control lift in different flight phases. They perform three roles: as flight spoilers, they reduce lift to help descent, speed control, or pitching moments without relying solely on elevators; as roll assist, they work with the ailerons to enhance lateral control by producing differential lift across the wings; and as ground spoilers, they deploy after touchdown to dump lift off the wings, increasing wheel load and braking effectiveness.

GLD, standing for Ground Lift Dump, is specifically the lift-dumping function used on landing, which is why this option captures the full set of capabilities. The other choices miss one or more of these roles: spoilers aren’t limited to ground use, they aren’t the primary means of aileron control, and stabilizer trim changes pitch rather than altering wing lift in flight.