M11.3 Flashcards
How far apart are frames normally positioned?
20 inches
Where is the keel beam located?
The centre wing section of the fuselage
Where does the maximum bending take place?
The wheel well area
What is the keel beam made up of?
Compression chords and stiffeners
When are pressure seals used?
When cables or rods need to pass through pressure bulkheads
Why do cabin doors have seals?
To prevent depressurisation and water getting in
What are the two types of seals fitted to doors?
Flap type and diaphragm
What inflates the door seals when its closed?
Cabin pressure
Why are ball mats used in the cargo bay?
For omni-directional handling
How are doors classified?
By there functions
What are the doors on the left hand side used for?
Passengers
What are the doors on the right hand side used for?
Servicing
When would a nose or side cargo door be used?
For loading the main deck
Where would a side cargo door be located?
The aft left side of the fuselage
What does the door lower lining cover?
The escape slide or survival kit
What does the doors centre lining cover?
The door structure and lath mechanism
What does the door upper lining cover?
Also door structure and latch mechanism however it also holds the escape lamp
What gas is used in the doors?
Nitrogen
At what angle does the slide inflate after being activated by the door?
Approximately 60°
What is a over wing escape hatch know as?
Plug doors
Why must a over wing escape hatch be pulled inwards?
Because its bigger than the aperture it fills
What position should the flight deck door be in when in flight?
Always locked unless someone needs entry
What is located in the lower half of the flight deck door?
Decompression and evacuation flap
What is used to operate the cargo doors?
Electrics or hydraulics
What is special about the bulk cargo door?
It opens inward and manually
How much differential pressure will force the vent door to open on the cargo doors?
One pound per inch sacred
What is meant by e-pump?
The system gets pressurised by an electric pump
What is meant by hand-pump?
The system is pressurised by hand pumping
Why are two windows used?
For fail safe
How are flight deck windows numbered?
One left, two left, etc
What are the forward two flight deck windows called?
Flight deck windscreen
What is used to bond all the window layers together?
Polyurethane
Where is the heating film located in the flight deck windows?
On the inner surface of the outer plane
What type of window is installed from inside?
The sliding windows
What type of windows are installed from the outside?
The fixed windscreens
What is placed between the window and frame?
A silicon seal
How is the cabin window attached to the aircraft?
Riveted to the inner surface of the fuselage skin
Why do the inner cabin window have a hole in it?
It makes sure that the pressure between the panes is the same as the cabin pressure
What are the three main areas of the wing structure?
- left wing box
- centre wing box
- right wing box
What is the top of the wing made from?
Aluminium-zinc alloy
What is the bottom of the wing made from?
Premium-copper alloy
What is the landing gear support arm also known as?
The false rear spar
What is the leading edge nose cap (slat) made from?
Aluminium
What is the dorsal fin used for?
To connect the fin to the fuselage
Why do hinges have an inner and outer bolt?
Just in case one fails
How many sleeves does a normal hinge have?
2
How many sleeves does a primary hinge have?
1
How is surface flutter created?
By the comparison of gravity and air-loads
How is surface flutter prevented?
By static balancing or If its hydraulically powered
How does static balancing work?
Weights are added in front of the hinge line
What is the deflection angle measured in relation to?
The zero position
What is meant by the zero position?
When its back to its original position
What is used to measure the deflection angle?
An inclinometer
What is the main function of a pylon?
To carry all the loads from the engine to the torque box
How many attachment points are there on a torque box (pylon)?
3 (2 forward and 1 aft)
How is the power plant divided into cooling zones?
By fireproof bulkheads
What is the engine inner firewall assembly made from?
Steel or titanium
How many engine mounts are there?
2 (forward and aft)
How many connections does each engine mount have?
3
