What are the two types of lighting available in the aircraft?

The correct answer highlights the two specific types of lighting systems available in the aircraft: the Emergency Lighting System (ELS) and Photoluminescent Emergency Marking (PEM).

The Emergency Lighting System (ELS) is a crucial component in aircraft safety, designed to provide illumination in critical situations where regular lighting may fail. It ensures that evacuation routes are visible and that passengers can find exits easily in the event of an emergency. This system is typically powered by backup batteries, allowing it to function even if the main power supply is compromised.

Photoluminescent Emergency Marking (PEM) serves a complementary role by using materials that glow in the dark to mark exit paths and safety equipment. These markings are non-electrical and activate after exposure to light, enhancing visibility in dark conditions and aiding passengers in navigating safely towards exits.

In contrast, other options describe lighting concepts that may not be specifically defined within standard aviation terminology. For instance, standard and emergency lighting are terms that exist but do not specify distinct systems as clearly as the chosen answer does. Long-range and short-range lighting are not conventional categorizations in aviation, and daytime versus nighttime lighting lacks the specificity needed for safety protocols. Therefore, the focus on distinct emergency systems in the correct