Which system uses the WOW sensor to enable ground spoilers and braking logic?

• A. Ground system activation; WOW sensor enables ground spoilers and braking logic.
• B. In-flight autopilot system.
• C. Cabin pressurization system.
• D. Fuel management system.

Answer: (A)

Weight on wheels is the signal that tells the aircraft it’s on the ground. When this WOW signal is true, the ground system activation logic is allowed to engage ground spoilers and the braking logic, enabling lift dumping and brake control specifically for rollout and landing performance. In flight, those spoilers and braking paths aren’t activated by WOW, because the aircraft isn’t on the ground and uses different control inputs. The other systems listed—autopilot, cabin pressurization, and fuel management—operate independently of weight-on-wheels, focusing on flight control, cabin environment, and fuel distribution, respectively.