What does PSU stand for?

What does PSU stand for?

• A. Public Service Unit
• B. Power Supply Unit
• C. Passenger System Unit
• D. Passenger Service Unit

Answer: (D)

In aviation, the PSU refers to the panel above each passenger seat that provides the passenger-accessible utilities—reading light, air vent, and the call button. It’s the unit you interact with to adjust your personal lighting and airflow, and in many aircraft it also contains the oxygen mask compartment. This is why the correct option is Passenger Service Unit: that term is the standard name for the above-seat cabin panel used by passengers and crew. The other terms aren’t used in this context—Public Service Unit and Passenger System Unit aren’t established aviation terms, and Power Supply Unit is a general electronics term, not the cabin equipment unit.

In aviation, the PSU refers to the panel above each passenger seat that provides the passenger-accessible utilities—reading light, air vent, and the call button. It’s the unit you interact with to adjust your personal lighting and airflow, and in many aircraft it also contains the oxygen mask compartment. This is why the correct option is Passenger Service Unit: that term is the standard name for the above-seat cabin panel used by passengers and crew. The other terms aren’t used in this context—Public Service Unit and Passenger System Unit aren’t established aviation terms, and Power Supply Unit is a general electronics term, not the cabin equipment unit.