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 for announcements, illuminated signs (to remind people that the cabin is a no-smoking zone and to wear a seatbelt), buttons to call for assistance (though these are mounted on the armrest on some aircraft), air condition vents, and automatically deployed oxygen masks in case of cabin depressurisation.[1]

May be absent or simplified on the smallest regional aircraft or on some very early-generation airliners [2]

References

  1. ^ "Master Minimum Equipment List (MMEL) Guidance Book" (PDF). Transport Canada. Government of Canada. July 2023. Retrieved 2026-03-01.
  2. ^ "Passenger Service Unit (PSU)". SKYbrary Aviation Safety. EUROCONTROL / Aviation Safety Network. Retrieved 2026-03-01.


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