S Subsidiary Airframe Structures

Question 1

What are the 3 subsidiary airframe structures?

Answer 1

1. Floor
2. Doors
3. Windows

Question 2

What supports the floor?

Answer 2

Aluminium alloy cross beams

Question 3

What are floor panels made of?

Answer 3

Light alloy or composite

Question 4

When would a floor need to be strengthened?

Answer 4

For large transport aircraft carrying freight

Question 5

What do floors contain to equalise pressure between levels?

Answer 5

Vents and blow out panels which reduce the impact of a rapid depressurisation

Question 6

What is a door?

Answer 6

An opening hinged on a vertical side

Question 7

What is a hatch?

Answer 7

An opening hinge on their top or bottom sides

Question 8

On small unpressurised aircraft what type of door is used?

Answer 8

Hinged on the forward edge and swing outwards and forwards, airstream holds the door closed in flight

Question 9

What is a plug door?

Answer 9

A door with tapered edges which fits into a sealed door frame

Question 10

When are you unable to open a plug door?

Answer 10

When the cabin is pressurised

Question 11

How does a plug door open?

Answer 11

Initially inwards then swings outwards

Question 12

What is the disadvantage of plug doors?

Answer 12

Impossible to open in the event of an emergency

Question 13

What is the advantage of a plug door?

Answer 13

Impossible to open when the aircraft is pressurised

Question 14

What do doors which hinge outwards require?

Answer 14

Complex latching and locking

Question 15

What direction do emergency hatches open?

Answer 15

Up and outwards

Question 16

What types of locks secure cargo doors?

Answer 16

Over-centre locks and pressurisation interlocks

Question 17

How do we monitor cabin doors?

Answer 17

Inspection window which indicates green for locked and red for unlocked, there is also an indication on the flight deck

Question 18

Which 2 features are essential for flight deck windows?

Answer 18

De/anti ice facilities and an interlayer which absorbs impact loads

Question 19

What is the difference between front windows and side windows?

Answer 19

Only require de mist feature, removable and large enough to be an emergency escape

Question 20

What is the purpose of the visual eye reference position aid?

Answer 20

To ensure bot pilots set their eye position to the correct point

Question 21

What are cabin windows made of?

Answer 21

Acrylic

Question 22

How many layers does a cain window have?

Answer 22

3 - outer, middle and inner

Question 23

Which panes are most important?

Answer 23

Outer and middle, designed to withstand 1.5x normal operating pressure