Passenger service unit
A passenger service unit (PSU) is an aircraft component situated above each row in the overhead panel above the passenger seats in the cabin of airliners. Among other things, a PSU contains reading lights, loudspeakers, illuminated signs, buttons to call for assistance, air condition vents, and automatically deployed oxygen masks.
![](../I/m/Passenger_oxygen_mask_dsc06035.jpg)
Oxygen masks deployed from a PSU
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