Engineering:Passenger service unit
From HandWiki
Short description: Aircraft component
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
- ↑ "Master Minimum Equipment List (MMEL) Guidance Book" (in en) (PDF). Government of Canada. July 2023. https://tc.canada.ca/sites/default/files/2023-07/master-minimum-equipment-list-mmel-guidance-book.pdf.
- ↑ "Passenger Service Unit (PSU)". EUROCONTROL / Aviation Safety Network. https://skybrary.aero/articles/passenger-service-unit-psu.
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