11.3 Flashcards
What is the difference between Pratt truss and warrent truss?
Pratt type have longerons supported by wood struts and wires
Warren truss have longerons exclusively attached by with diagonal members load can be transferred from tension to compression.
What are the benefits of stressed skin fuselage?
All loads carried on skin can be built clean and smooth
What construction does a pressurised fuselage have?
Almost all are semi monocoque
What is a pressurised aircraft sealed with?
Two part polysufide sealant
Where is sealant applied to pressurised aircraft?
Skin joints, seams, repairs and patches.
How is sealant typically applied to aircraft fuselage?
Faying
Fillet
What is faying sealing?
A fay is an overlapping pieces of metal with a bead of sealant placed between them
What is a fillet seal?
Two metals join eg. stringer to skin.
How are electrical cables sealed?
Specially designed rubber or silicone
How are wings attached to the fuselage?
- Either above or below the fuselage
- fuselage can be cut to accept a centre wing section
- strong fuselage frames or bulkheads are used in attachment and transfer stress
- fittings/ lugs are mounted on frame and on forward + aft wing spars
How are vertical and horizontal stabilisers attatched?
-Similar to wings
- vertical bolted fittings on a frame member or bulkhead
- stabiliser front and rear spar
How are pylons attatched?
The pylon has upper middle and lower spars which transfers thrust to wing spars it is contained in nacelle with firewall
How is landing gear attatched?
It is connected to wing spars or an attachment connected to spars
What is the construction of wheel wells?
They are strong box like structures sometimes walls are bulkheads
What are the tracks for seats used names?
L or I tracks
What are the benefits of seat rails?
- adjustable
- galleys can be moved and installed
-easy removal
What do cargo transport components in cargo loading systems include?
-ball mats
-ball trays
-roller mats
-doorsill protectors
What do guidance components in cargo loading bays include?
-guide rails
-side rails
-centreline splitters
-door guides
-protection guides
-overideable centre guides
What do restraining and locking components in cargo loading systems include?
-Cargo locks
-Outboard and centreline restraints
-forward and aft end stops
What do the cargo components allow for in the ball mat area?
Movement in any direction
Which directions in loading or drive components allow for movement in?
Longitudinal (one direction)
What is the function of the anti roll out (ARO) device?
Stopping cargo rolling out the aircraft and protecting the doorsill that functions automatically
What are the main entry doors and their design?
Plug type
quick, safe and effective unloading or loading of people
What are service doors and their design?
Non plug type
Servicing the aircraft
What are cargo doors and their design?
Non plug type
Doors to the cargo compartment
What is a plug type door?
Seals itself in with pressure once pressurised
What is a non plug type door?
It has a lock mechanism to hold it in place and swings outwards
What are the features of main entry doors?
Left and right sides, the left are primarily used for load and right primarily galley servicing the doors have visual identification warning systems and they can be used for emergency exits
How is a door structured?
It has a riveted assembly similar to structural members containing beams which are the main structures, formers which connect parts and attach brackets as well as intercostals which give additional rigidity