What role does the Passenger Service Unit (PSU) play in an aircraft?

The Passenger Service Unit (PSU) serves a crucial role in enhancing the comfort and safety of passengers during a flight. It is typically located above the passenger seats and houses several important features that directly impact the passenger experience. For instance, the PSU includes individual reading lights, air nozzles for personalized air circulation, and sometimes access to oxygen masks in case of an emergency.

Additionally, the PSU is designed to ensure that necessary safety instructions are accessible to passengers, contributing to overall safety during the flight. This multifaceted functionality aligns closely with the concept of providing comfort and safety features, which makes this response the correct choice.

While other options relate to components of an aircraft’s operation, they do not pertain specifically to the functions of the PSU. For example, monitoring cabin pressure involves systems separate from the PSU, and in-flight entertainment systems are operated through different mechanisms within the aircraft. Similarly, cabin crew schedules are managed by operational staff and are not a function of the PSU. Therefore, the focus of the PSU on passenger comfort and safety effectively distinguishes it from the other options.