11.03 Airframe Structures - Aeroplanes Flashcards
What component reduces the column length of stringers?
Frames
What spacing is generally used between frames?
20 inches
What loading do stringers support?
- Bending
- Shear
- Torsion
- Pressure
At production breaks, how can stringers be connected together?
Stringer splices
What shapes of clip can be used to attach stringers to frames?
Angles or T clips (cleats)
What loads for the floor beams support?
- Pressure loads
- Loads of seat tracks
- Floor panels
What is the purpose of the keel beam?
Supports the wheel well area and wing loads
What are the four categories of door?
- Main
- Service
- Cargo
- Emergency
Where are the main cargo doors located?
In the lower part of the aircraft
What equipment can be found under the lower lining?
- Escape slide
- Survival kit
What functions do the door seals fulfil?
Act as pressure and weather seals
What is the purpose of the overhead hatch in the cockpit?
Emergency exit for the flight crew
When do power assist systems operate on passenger doors?
In an emegency
In a door locking mechanism, what is the purpose of the over-centre spring?
It prevents the selector lever being in an intermediate position
What position is the door mode selector if the girt bar is engaged?
Armed, auto and flight
What is the reason for an emergency power reservoir on passenger doors?
To assist in opening the doors in an emergency
What is special about the number two cockpit windows?
There are direct vision windows which can open and slide
With regard to doors, which mechanism or component does the safety mechanism operate?
It operates the door lock cams and vent door
What must be ensured when you remove a charged door emergency power reservoir?
Ensure it is safe (pinned)
What differences are there between the bulk cargo door and the other forward, aft and side cargo doors?
- Bulk cargo door opens inwards and is mechanically operated
- Forward, aft and side doors are electrical or hydraulic and open inwards
When the cargo door lever is operated, its movement is first transmitted to the…
Master lock latch mechanism
How are the pressurisation loads supported by the door structure?
Pressure stops
How does the emergency door slide connect to the cabin floor?
Girt bar
Which pylon link(s) transmit longitudinal loading?
Rear
What is the purpose of the fan cowl support beam?
Support the fan cowl
How are landing loads transmitted into the wing structure?
Rear spar and false rear spar
What is the construction of a vertical stabiliser?
- Front spar
- Ribs
- Auxiliary spar
What is the function of the centre fuselage section?
The structure for joining the centre wing box and the MLG together
Which section of the airframe are the wings attached to?
The centre section
What is the purpose of the dorsal fin on the aircraft?
- Extend the fin for longitudinal stability
- Join the vertical stabiliser to the fuselage
