Which of the following is a valid ground spoiler deflection angle activated by weight on wheels?

Which of the following is a valid ground spoiler deflection angle activated by weight on wheels?

• A. 40°
• B. 60°
• C. 70°
• D. 80°

Answer: (B)

Ground spoilers are designed to dump lift and aid braking once the airplane sits on the ground. When weight on wheels is detected, the spoilers deploy to a fixed angle to ensure rapid lift destruction without overloading the wing or disturbing control. On this airplane, the maximum ground spoiler deflection is sixty degrees, which provides enough lift loss to transfer weight to the main gear and maximize braking effectiveness while staying within the system’s limits. Deflections smaller than that would not unload the wing sufficiently for optimal braking, and larger deflections would exceed mechanical limits and could affect handling.

Ground spoilers are designed to dump lift and aid braking once the airplane sits on the ground. When weight on wheels is detected, the spoilers deploy to a fixed angle to ensure rapid lift destruction without overloading the wing or disturbing control. On this airplane, the maximum ground spoiler deflection is sixty degrees, which provides enough lift loss to transfer weight to the main gear and maximize braking effectiveness while staying within the system’s limits. Deflections smaller than that would not unload the wing sufficiently for optimal braking, and larger deflections would exceed mechanical limits and could affect handling.