When are the landing and taxi lights activated by the LDG and TAXI switches?

The landing and taxi lights are activated by the LDG and TAXI switches when the gear is down and locked. This design is intentional to enhance safety and ensure that the pilot has the necessary lighting for both landing and taxiing phases, which occur when the aircraft is in a stable configuration with the landing gear extended.

During the landing phase, having the lights on provides better visibility for the runway and enhances the visibility of the aircraft to others. Similarly, when taxiing, these lights help to illuminate the path ahead and increase the glare for other ground traffic, allowing for a safer operational environment.

The other choices presented do not align with the aircraft's design and operational protocols regarding the activation of landing and taxi lights. For instance, activating them when the gear is up would not be safe, as it may mislead ground personnel or other aircraft about the state of the aircraft's landing configuration. Additionally, activating them only during taxiing on the runway or during nighttime operations does not encompass the full operational intent of these lights, which is integrated with the landing gear status.