S Subsidiary Airframe Structures Flashcards
What are the 3 subsidiary airframe structures?
- Floor
- Doors
- Windows
What supports the floor?
Aluminium alloy cross beams
What are floor panels made of?
Light alloy or composite
When would a floor need to be strengthened?
For large transport aircraft carrying freight
What do floors contain to equalise pressure between levels?
Vents and blow out panels which reduce the impact of a rapid depressurisation
What is a door?
An opening hinged on a vertical side
What is a hatch?
An opening hinge on their top or bottom sides
On small unpressurised aircraft what type of door is used?
Hinged on the forward edge and swing outwards and forwards, airstream holds the door closed in flight
What is a plug door?
A door with tapered edges which fits into a sealed door frame
When are you unable to open a plug door?
When the cabin is pressurised
How does a plug door open?
Initially inwards then swings outwards
What is the disadvantage of plug doors?
Impossible to open in the event of an emergency
What is the advantage of a plug door?
Impossible to open when the aircraft is pressurised
What do doors which hinge outwards require?
Complex latching and locking
What direction do emergency hatches open?
Up and outwards
What types of locks secure cargo doors?
Over-centre locks and pressurisation interlocks
How do we monitor cabin doors?
Inspection window which indicates green for locked and red for unlocked, there is also an indication on the flight deck
Which 2 features are essential for flight deck windows?
De/anti ice facilities and an interlayer which absorbs impact loads
What is the difference between front windows and side windows?
Only require de mist feature, removable and large enough to be an emergency escape
What is the purpose of the visual eye reference position aid?
To ensure bot pilots set their eye position to the correct point
What are cabin windows made of?
Acrylic
How many layers does a cain window have?
3 - outer, middle and inner
Which panes are most important?
Outer and middle, designed to withstand 1.5x normal operating pressure
