What must be the lighting setting in a "Non BSI A/C" during dusk?

In a "Non BSI A/C" operational setting during dusk, the appropriate lighting choice is to set it to DIM. The DIM setting provides sufficient but not overwhelming illumination that is crucial for maintaining visibility in the cabin while also allowing passengers' eyes to adjust to the lower light levels outside as daylight fades. This is particularly important for ensuring comfort and safety as it enhances the ambiance without creating a glare that could interfere with external visibility.

Choosing DIM is strategically significant as it balances functionality and passenger comfort, making it the ideal lighting option during this transitional time of day. Additionally, this setting prepares the cabin for the night configuration, facilitating a smoother adjustment for both crew and passengers as darkness envelops the surroundings.