What is the first step to allow lights to warm up on the FA Control Panel?

Setting the lights to BRT (brightness) is the first step to allow the lights to warm up on the Flight Attendant Control Panel. When the lighting is set to BRT, it ensures that the lights reach their full intensity, facilitating a quicker and more effective warming-up process. This is essential for visibility in the cabin, especially during boarding and other critical phases of flight.

In contrast, setting the control to OFF would not activate the lights at all, preventing them from warming up. Setting it to DIM would provide reduced lighting, which is not effective for warming up the lights. The AUTO setting might adjust brightness based on ambient light but does not guarantee the initial warm-up action needed. Therefore, BRT is the most effective choice for making sure the cabin lights are fully operational as soon as possible.