In a "Non BSI A/C", what lighting setting is required during hours of darkness?

In a "Non BSI A/C" (non-Basic Safety Information Aircraft), the lighting setting required during hours of darkness is that the interior lighting must be set to OFF. This practice is essential for minimizing distractions and ensuring the cockpit remains as dark as possible, which aids the pilots in maintaining their night vision and focus during flight operations.

Maintaining a low light level is particularly important in non-BSI aircraft, where the cockpit design and systems may not support additional lighting requirements found in other aircraft types. By keeping the lights off, it enhances the airplane's operational safety during night flights.

The options for DIM, NIGHT, and WORK lighting typically serve specific purposes, usually in aircraft with different lighting regulations or when specific tasks require dedicated illumination. However, in a non-BSI context, the directive is to keep lights off to prioritize visibility outside the aircraft and reduce glare for the flight crew.