Passenger service unit
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.
May be absent or simplified on the smallest regional aircraft or on some very early-generation airliners
Sources and credits
This article is adapted from the Wikipedia article “Passenger service unit”, written by its contributors and licensed under CC BY-SA 4.0. Fathomly has changed the layout, removed citation markers, navigation and maintenance notices, and adjusted punctuation. This adapted version is shared under the same license. For references, see the original article.
Images, from Wikimedia Commons:
- PECO Passenger Service Unit.jpg by Mottsarah, CC BY-SA 4.0
- Passenger oxygen mask dsc06035.jpg by David Monniaux, CC BY-SA 3.0
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