What conditions must be met for ground spoiler deployment?

For ground spoiler deployment, both throttles need to be at idle while specific conditions related to aircraft speed and configuration must also be satisfied. This requirement is crucial because ground spoilers are designed to enhance the aircraft’s stopping capability by increasing aerodynamic drag and reducing lift during landing, thus improving safety and performance.

In this context, having both throttles at idle ensures that the aircraft is in a deceleration phase typically associated with landing or taxiing, making it safe to deploy the spoilers to assist in slowing down the aircraft. The conditions that must accompany this include the aircraft being on the ground and possibly meeting certain speed thresholds to ensure that the spoilers are deployed effectively without compromising safety.

Other options do not accurately reflect the necessary conditions for spoiler deployment. For example, having one throttle at takeoff does not provide the right conditions for effective ground spoiler operation, as the aircraft would not be in a landing scenario. Similarly, relying solely on the radar altitude being above 7 feet or the wing flaps being extended does not capture the comprehensive conditions necessary for ground spoilers to deploy correctly. The focus on both throttles being at idle highlights a critical aspect of safe aircraft operation during landing.