What does the Passenger Service Unit contain?

The Passenger Service Unit (PSU) is an important component found in the overhead compartments of an aircraft cabin, primarily above passenger seating areas. Its primary purpose is to provide necessary services and controls for passengers during a flight.

One of the main features it contains is the ventilation system, which allows for individual control of airflow to ensure passenger comfort. Additionally, the PSU typically includes light controls that enable passengers to adjust the reading light as needed. This functionality contributes significantly to the overall comfort and experience for passengers onboard.

The other aspects mentioned, such as in-flight safety guides, emergency exit information, and passenger entertainment options, are important but are typically found in different locations or formats throughout the aircraft rather than being integral components of the PSU itself. For example, safety guides and emergency information are usually found in the seatback pocket, while entertainment options might be accessed through individual screens or shared monitors, rather than through the PSU controls directly.