Passenger service unit

A passenger service unit 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, buttons to call for assistance, air condition vents, and automatically deployed Emergency [oxygen system|oxygen masks] in case of cabin depressurisation. These are not found on the smallest of feederliners, or on older aircraft.
Category:Safety equipment
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