PSU denotes which of the following?

• A. Power Supply Unit
• B. Passenger Safety Unit
• C. Planned Service Unit
• D. Passenger Service Unit

Answer: (D)

Understanding acronyms in aviation cabin equipment helps here. PSU is the Passenger Service Unit—the panel above each passenger seat that houses the reading light, air vent, call button, and other passenger amenities. This term is standard in cabin diagrams and safety manuals, so it matches what PSU typically denotes in this setting.

The other interpretations don’t fit the aviation cabin context. Power Supply Unit is an electronics term for devices that provide electrical power, not a cabin panel. Passenger Safety Unit and Planned Service Unit aren’t the conventional terms used for this context, so they’re not the correct interpretation.