Passenger Service Units (PSU)
Passenger Service / Support Units (PSU) contain a combination of Cabin Crew call button, reading lights, loudspeakers, illuminated signs, air vents / gaspers, and oxygen masks.
PSU – Recessed
Overhead Passenger Service / Support Units that are recessed into the luggage bin overhead.
PSU – Canoe
Early commercial jet overhead Passenger Service Units.
PSU – Commuter
Overhead Passenger Service Units for a non-pressurized aircraft.