Which condition will activate the landing gear warning signal?

The condition that will activate the landing gear warning signal occurs when one power lever is retarded to idle while the landing gear is not locked down. This design feature serves as a safety protocol to prevent potential accidents related to landing gear configuration.

When the power lever is moved to idle, it suggests a reduction in thrust and an approach to landing. If the landing gear is not properly secured in the down-and-locked position, this could lead to a situation where the aircraft is approaching landing with insufficient gear configuration, thereby necessitating an alert to the flight crew.

The activation of the warning signal allows the crew to take corrective action, ensuring that the aircraft is landing safely and complies with operational protocols. Thus, this condition effectively prioritizes safety by providing timely warnings based on state changes in the aircraft’s power and landing gear systems.