What indicates that the landing gear is transitioning between positions?

The correct answer is a change in indicator light color. This choice is significant because many aircraft utilize various colored indicator lights to communicate the status of the landing gear to the pilots. For instance, when the landing gear is transitioning between the 'up' and 'down' positions, the indicator lights may change from green (indicating that the gear is down and locked) to red or yellow (showing that the gear is either in transit or that there is an issue). This color change provides an immediate and clear visual cue, allowing pilots to confirm that the landing gear is actively moving into position.

In contrast, a continuous alarm typically signals an issue or a warning rather than indicating transition, while a red light flashing may serve different purposes, such as being a warning for malfunction. Having no indication during the transition would lead to uncertainty about the landing gear position, which could pose significant safety concerns during critical phases of flight. Therefore, the change in indicator light color serves as a crucial tool for communication and safety in monitoring the landing gear status.