CAPTAIN/FIRST OFFICER SEATS

  • Seat height lever
  • Track lock lever
  • Thigh pad adjustment handwheel
  • Seat recline lever
  • Armrest height adjustment knobs
  • Lumbar support (back cushion) position
  • Two lumbar support hand wheels
  • Lumbar adjustment knob – UP/DOWN
  • Lumbar adjustment knob – IN/OUT
  • Headrest position lock mechanism

The first observer’s seat is stowed in the sidewall of the flight compartment. The seat is a folding non-adjustable type seat. To release the seat from the stowed position, push the two release pins. To stow the seat, push the locks on the back of the seat to release the back of the seat from the sidewall brackets.

The second observer’s seat (if installed) is adjustable and attached to the flight compartment wall behind the captain’s seat.

DRIP PAN

  • The drip pan removes the condensation from the flight compartment ceilings and protects electrical equipment from water damage and corrosion.
  • The drip pan is attached to the structure above the overhead instrument panel in the flight compartment.
  • The drip pan is made of plastic and has insulation blankets. The condensation collects on the outboard side of the drip pan and drains through the installed tubing into the airplane’s drain system.

OVERHEAD STOWAGE BINS

  • The bin buckets lower down to stow and remove baggage.
  • The overhead stowage bins are a honeycomb composite.
  • Each overhead stowage bin has a strongback assembly and a bin bucket assembly.
  • A bin bucket assembly has these components:
    • Bin bucket
    • Latch handle
    • Latch (2)
    • Rate control receiver (2)
    • Bucket pivot half (2)
    • Bin assist mechanism (BAM) (aft side of bin bucket)
    • BAM lever mechanism (aft side of bin bucket).
  • A strongback assembly has these components:
    • Turnbuckles
    • Rate control rod (2)
    • Closeout cloth
    • BAM ramp (aft side of strongback assy)
    • latch pin (2)
    • Strongback pivot half (2).

BAM

  • The bin bucket assemblies have a bin assist mechanism (BAM). The BAM decreases the force necessary to close the bin bucket. A BAM lever mechanism arms the BAM. The BAM lever mechanism is on the aft inboard end of the bin buckets. There is no label for the BAM lever position. The BAM moves up the BAM ramp to help close the bin bucket.
  • The two most forward and the most aft stowage bins on each side do not have BAMs. They are smaller stowage bins.
  • Disconnect the rate control rods and BAM to remove the bin bucket assembly.

BAM Operation

  • There are two procedures to operate the bin buckets of the overhead stowage bins.
  • One procedure does not use the bin assist mechanism (BAM). The BAM is not necessary for light baggage. 
  • The second procedure uses the BAM. This decreases the force necessary to close the bin bucket with heavy baggage.
  • Arm the BAM lever only when the bin bucket has a heavy load of 80 lbs or more.
  • Push the BAM lever down to arm the BAM.
  • The BAM engages if there is a downward force more than 80 lbs on the bin bucket.
  • The BAM lever disarms while the bin closes but the BAM stays engaged.
  • The BAM only disengages when the bin bucket opens fully.
  • The BAM makes two click sounds when it disengages.
  • The load limit on the placard of a 60 inch stowage bin module is 104 lbs. A force of 30 lbs is necessary to close a full bin bucket with the BAM engaged. A force of 50 lbs is necessary to close a full bin bucket with the BAM not engaged.
  • Do not arm the bin assist lever with light baggage in the bin bucket. If you pull down on the bin bucket, the BAM will engage. The bin bucket will close with force. The bin bucket will not open easily and you must pull it down to open it. You must manually disengage the BAM.

CENTER OVERHEAD STOWAGE BOX

  • are in the ceiling area of the passenger compartment at these locations:
    • Forward cabin area (2x)
    • Mid cabin area (2x)
    • Aft cabin area – in some aircraft.

PSU – PASSENGER SERVICE UNITS

  • Fasten seat belt and no smoking signs
  • An air outlet for each seat
  • A PA speaker
  • An attendant call button and call light
  • Oxygen generators
  • Oxygen masks
  • A white LED reading light and switch for each passenger

The PSU has hinges on the outboard side and latches on the inboard side. Small holes (2) are provided on the face panel of the PSU to get access to the release latches. A lanyard installed on the inboard side limits the outboard movement as the unit opens.

ASU & LSU

  • Attendant Service Units (ASU)
  • Lavatory Service Units (LSU)
  • An ASU is installed at each attendant station and an LSU is installed in each lavatory.
    • Oxygen mask (2)
    • Oxygen generator
    • Door latch actuator
    • Test stop button

CABIN ATTENDANT STATION / SEATS

  • The cabin attendant stations/seats have a shoulder harness and seat belt that are used for takeoffs and landings.
  • The cabin attendant stations are installed by the forward and aft entry doors.
  • Each attendant station can hold two attendants.
  • The attendant seats are spring-loaded to retract the seat to the stowed position when it is not occupied.
  • The attendant seat cushions attach to the seat assembly with hook-and-loop tape. The cushions are removable and can be used as a flotation device.

PASSENGER SEATS

  • The passenger seat has a reclining mechanism.
  • Each passenger seat has a safety belt installed.
  • The passenger seats that are adjacent to windscreens have trays below their arm rests.
  • The seats that are adjacent to the emergency exit/escape hatches, the arm rest attaches to the escape hatch and not the seat. This will make sure that the escape hatches can open quickly in an emergency.
  • There can be two- or three-passenger seat assemblies installed. 
  • The seat configurations can be four, five, or six side by side configurations.

WINDSCREENS

  • The passenger windscreens provide protection from the weather when the entry or service doors are open.
  • The windscreens are crushed-core composite panels with a decorative stain-resistant cover.
  • The windscreens are installed aft of the forward service or entry door, or forward of the aft entry or service door.
  • There are airplanes that have windscreens with stowage units or closets.

CLOSETS

The closets have this equipment:

  • Coat rods
  • Lights
  • Panel doors
  • Magazine stowage compartments
  • Emergency equipment

FLOOR COVERING

  • The carpets are installed on the passenger compartment floor, but not the door entries, galley’s or lavatories. 
  • The carpets decrease the level of sound and make it easy to walk on. 
  • Mats (vinyl mat) are installed at the door entrances, galleys, and lavatories that are non-skid and water resistant.

CLASS DIVIDERS

  • Class dividers provide separation.

GALLEY

  • The galley area is a non-passenger compartment that is used to store and prepare food and beverages for passengers.
  • The airline will determine the amount and the location of the galleys. There are seven possible galley locations.
  • The airplane galleys can have different inserts. The items that follow are typical galley inserts:
    • Chillers
    • Oven (single, double, steam)
    • Refrigerator, Refrigerator/Freezer
    • Coffee maker, espresso/cappuccino maker, water boiler
    • Waste Disposal System
    • Sink
    • Storage
    • Trash compactor/Waste container
    • Serving carts
  • The electrical system gives three-phase, 115 VAC power from the No. 1 and No. 2 generator buses to the galley’s. The switch that controls the electrical power to the galley is installed on the P5 overhead panel.
  • The galley gets pressured potable water through a quick-disconnect fitting.
  • Waste water drains into the airplane water waste system.
  • The galley has ventilation ducts that remove odors and fumes that collect in the galley.
  • The galley also has a communication system to brief passengers and emergency lighting, if a power failure occurs.

LAVATORIES

The airplane lavatories are modular and self-contained units. 

The airline determines the number and location of the lavatories. There are eight possible lavatory locations.

The lavatories have the following equipment:

  • Air freshener (some installations)
  • Air sickness bag and sanitary napkin dispenser
  • Ashtray (interior and exterior)
  • Assist handle
  • Attendant call button and reset switch
  • Coat hook
  • Diaper changing table (some installations)
  • Dual roll toilet paper holder
  • Temperature adjustable, time delay faucet
  • Facial tissue dispenser
  • Fire extinguisher (in waste compartment)
  • Flushing toilet, with toilet seat and cover
  • Non-glass mirror (shatter resistant)
  • Handicap assist rails (some installations)
  • Information and instruction placards (including NO SMOKING sign)
  • Light switches
  • Oxygen masks (2)
  • Paper cup dispenser
  • Paper towel dispenser
  • Public address system loudspeaker
  • Removable waste container
  • RETURN TO SEAT sign
  • Shaver outlet, 115v ac, 60 Hz (some installations)
  • Smoke detector (in the ceiling)
  • Soap dispenser (some installations)
  • Toilet seat cover dispenser
  • Hybrid sink deck
  • Metal waste flap door with polycarbonate symbolic placard.
  • Wash basin with a stopper, faucet, and counter assembly
  • Water heater. 

The airplane potable water system supplies water to the lavatories.

A lock with a safety-release lever is installed in each lavatory door. When the lavatory is occupied and the door is locked, the opposite side of the lavatory door shows OCCUPIED. The lavatory can be unlocked from the passenger compartment side of the door without the use of special tools.

EMERGENCY EQUIPMENT

Emergency equipment requirements can be different on the airplane because of the flight path. The equipment installed on the airplane must agree with the specified requirements of the flight path. See your operation’s manual and the applicable regulations to make sure that minimum emergency equipment is installed on the airplane.

ESCAPE SLIDES

  • The escape slides help passengers and flight crew exit the airplane in an emergency. The escape slides can be disconnected from the airplane and used as flotation devices if the airplane lands on water.
  • Operation
    • For the entry and service doors, remove the girt bar from the stowage hooks on the door and install it in the floor brackets to arm the escape slide.
    • Open the door as usual but do not hesitate until it is fully open.
    • The girt strap will extend while you open the door.
    • As you open the door, the girt latch assembly will let the slide pack fall out of the slide cover.
    • As the slide pack falls, it will start the slide inflation.
    • The escape slide will fully inflate in approximately six seconds.
    • If the escape slide does not inflate automatically, pull the inflation handle sharply to inflate the escape slide manually.
    • To remove the escape slide from the airplane, lift the cover flap and pull the girt release handle.
    • The escape slide will remain connected to the airplane by the mooring line until the line is released, cut, or the frangible link breaks under load.
    • Activation of the lighting system is automatic during inflation of the slide.
  • Girt Bar Mechanism
    • The girt bar is attached to the slide and holds the escape slide on the forward/service door exit sill during and after slide deployment.
    • There are girt bar locks on each end of the girt bar that lock the girt bar to the floor brackets.
AviationHunt Team

Our team at AviationHunt is a group of aviation experts and enthusiasts. We aim to provide aviation insights, technical notes, best aircraft maintenance practices, and aviation safety tips.