When does a landing gear position and warning system provide a warning in the cockpit?

The landing gear position and warning system is designed to enhance safety during the landing phase of flight by alerting the pilots to critical situations regarding the landing gear status. The correct scenario for triggering a warning is when the throttle is retarded and the gear is not down and locked.

When pilots reduce throttle, indicating preparation for landing, the system monitors the position of the landing gear. If the gear is not down and locked, the warning alarms the crew to ensure that it is properly deployed before landing. This prevents potential landing gear-related accidents, which could arise if the aircraft attempts to land without the gear extended.

The other scenarios do not trigger this specific warning: merely increasing the throttle does not necessitate gear deployment, having the gear down but not locked would not typically trigger the warning as the system primarily focuses on the lack of a down-and-locked status during critical phases; low altitude warnings are more related to terrain rather than gear deployment.