PECO Passenger Service Unit for the Boeing 737Oxygen masks deployed from a PSU
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 aircraft 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. These are not found on the smallest of feederliners, or on older aircraft. [citation needed]
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Aircraft components and systems
Airframe structure
Aft pressure bulkhead
Cabane strut
Canopy
Crack arrestor
Cruciform tail
Dope
Empennage
Fabric covering
Fairing
Flying wires
Former
Fuselage
Hardpoint
Interplane strut
Jury strut
Leading edge
Lift strut
Longeron
Nacelle
Rib
Spar
Stabilizer
Stressed skin
Strut
T-tail
Tailplane
Trailing edge
Triple tail
Twin tail
V-tail
Vertical stabilizer
Wing root
Wing tip
Wingbox
Flight controls
Aileron
Airbrake
Artificial feel
Autopilot
Canard
Centre stick
Deceleron
Dive brake
Dual control
Electro-hydraulic actuator
Elevator
Elevon
Flaperon
Flight control modes
Fly-by-wire
Gust lock
HOTAS
Rudder
Rudder pedals
Servo tab
Side-stick
Spoiler
Spoileron
Stabilator
Stick pusher
Stick shaker
Trim tab
Wing warping
Yaw damper
Yoke
Aerodynamic and high-lift devices
Active Aeroelastic Wing
Adaptive compliant wing
Anti-shock body
Blown flap
Channel wing
Dog-tooth
Drag-reducing aerospike
Flap
Gouge flap
Gurney flap
Krueger flap
Leading-edge cuff
Leading-edge droop flap
LEX
Slats
Slot
Stall strips
Strake
Variable-sweep wing
Vortex generator
Vortilon
Wing fence
Winglet
Avionic and flight instrument systems
ACAS
Air data boom
Air data computer
Aircraft periscope
Airspeed indicator
Altimeter
Annunciator panel
Astrodome
Attitude indicator
Compass
Course deviation indicator
EFIS
EICAS
Flight management system
Glass cockpit
GPS
Head-up display
Heading indicator
Horizontal situation indicator
INS
ISIS
Multi-function display
Pitot–static system
Radar altimeter
TCAS
Transponder
Turn and slip indicator
Variometer
Yaw string
Propulsion controls, devices and fuel systems
Autothrottle
Drop tank
FADEC
Fuel tank
Gascolator
Inlet cone
Intake ramp
NACA cowling
NACA duct
Self-sealing fuel tank
Splitter plate
Throttle
Thrust lever
Thrust reversal
Townend ring
War emergency power
Wet wing
Landing and arresting gear
Aircraft tire
Arrestor hook
Autobrake
Conventional landing gear
Drogue parachute
Landing gear
Landing gear extender
Oleo strut
Tricycle landing gear
Tundra tire
Escape systems
Ejection seat
Escape crew capsule
Other systems
Aircraft lavatory
Auxiliary power unit
Bleed air system
Deicing boot
Emergency oxygen system
Environmental control system
Flight recorder
Hydraulic system
Ice protection system
In-flight entertainment system
Landing lights
Navigation light
Passenger service unit
Ram air turbine
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