AGK Systems - Aircraft Subsidiary Structures

Question 1

Large Aircraft Floor configuration

Answer 1

Supported bu aluminium alloy cross beams fixed to fuselage frames

Floor panels are then laid over the beams

Panels are either light alloy or composite material

Question 2

Light Aircraft Floor

Answer 2

Majority of the floor is made up of the wing section extending through the cabin

Alternatively it may be formed as an integral part of the shell halves which make up the fuselage

Question 3

Light a/c doors and hatches

and uses

Answer 3

Door: Hinged on vertical side

Hatch: Hinged on their top our bottom sides

Doors and Hatches
~Normal Access
~Emergency access/exit
~Cargo access
~Routine servicing (e.g. avionics bay)
~Cabin service equipment to the galleys

Question 4

What is a plug door?

Answer 4

Used for normal access to most airliners (pressurised cabin)

Has tapered edges which fit snugly in a tapered door frame

When door is closed, its physically incapable of opening outwards, it must (initially) open inwards

The greater the pressure differential between cabin and atmosphere, the tighter the seal

Pins and stops ensure security and transmit door loads to the rest of the fuselage

Question 5

Plug Door pros/cons)

Answer 5

Physically impossible to open plug door when aircraft is pressurised
~This improves door/structure security

Potential Error
~Unless pressure hull is depressurised once a/c is on the ground, the internal cabin pressure can make it impossible to open the plug type door

Question 6

Inspection and Monitoring

Answer 6

Cabin doors have inspection windows to visually confirm that all locks are engaged

Green - locked

Red - unlocked

Visual door indictors in cockpit on large a/c

Question 7

Flight deck windows

Answer 7

Must have de-ice/anti ice facility

Windscreen panel is compromised of two preformed and tempered transparent glass plies

Heated

An interlayer absorbs impact loads and prevent the glass from fragmenting if it fails

Designed to withstand 4lbs bird impact

Question 8

Flight deck side panel windows

Answer 8

Side panels are removeable

Mostly used for Emergency use

Question 9

Eye Reference Position

Answer 9

Question 10

Passenger Cabin Material

Answer 10

Acrylic to reduce weight

3 layers: outer, middle and inner

Inner pane is not structural

Outer and middle panels are capable of taking full pressurisation loads
~ can handle x6 of load at 8spi