11.3 - Structures Flashcards
Structures
What is the primary function of the fuselage frames
To maintain the shape of the fuselage and to carry and distribute shear and tension loads
What is the purpose of the dorsal fin
to join the fin smoothly to the fuselage
What is the purpose of the sliding cockpit window
To provide a crew emergency exit and to give direct vision of the ground
What is the main function of the passenger door torque tube
to rotate the door to the cocked position
What are the main structural components in an aircraft wing
Ribs, Spars, Stringers and skin
What is the mainframe of the wing designed to do
Transmit loads to the fuselage structure
How can the front spar of the horizontal stabilizer be accessed
from the front by removing the removable leading edge
Which of the following statements are true
Stabilizers, both vertical and horizontal are outside of the fuselage pressurized area
What is the purpose of a failsafe bolt on the control surface hinges
to provide a safety method of maintaining structural integrity should one of the internal or external parts of the bolt be damaged
What loads are transmitted by the pylon bearings
Lateral and longitudinal loads between the wing and pylon
What is the purpose of the wing to nacel fairings
To provide an aerodynamic profile to reduce drag
How is an engine pylon attached to the wing
2 links at the front and a Pair of shackles at the rear
What is the purpose of a vent hole in the inner pane of the cabin window
To equalise the pressure between the two panes and the cabin
How are the cockpit windows and windscreens installed
Externally onto the aircraft frame structure
What is the function of a stringer
It gives shape to the fuselage shell and carries, bending, shearing, torsion and cabin pressure
Which wing components are normally used to attach the leading and trailing edges
Vertical stiffners attached wing spar webs
Which loads are mainly carried to the fuselage structure by the wing upper skin panels
Compression loads
Which statement is correct for the fan cowl support beam
It supports the fan cowl and transmits the loads to the pylon torque box
Which components go together to form a nacelle strut assembly
Frames, skins and structure
What does the girt mechanism do
It engages or disengages the girt bar when the mode selector lever is placed in either manual or automatic
On airbus aircraft, how is the girtbar checked for engagement and disengagement
It can be checked by visual indicators at floor level
What does the center wing box support
It supports the fuselage, left wing box and right wing box
What is the function of the horizontal stabiliser
To provide pitch trim control
What is the function of the rudder
To provide directional control
Why is it necessary to balance the ailerons with additional weight
To achieve static weight balancing
Where would movable rudders be attached
On the trailing edge of the fin
What is the purpose of the firewalls within the pylons
They prevent fire from propagating to other areas
What is an engine mount
The engine attachment to the pylon
What is the function of the keel beam
It supports the wheel well area where a maximum amount of bending may occour
Areas of an aircraft’s structure that is difficult or impossible to seal after assembly are sealed using which of the following methods
Faying surface seals
Which of these statements about the wing boxes are correct
The right and left wing box are supported by the centre wing box
What is the purpose of the dorsal fin
To create a smooth, aerodynamic join between the fin and the fuselage
How are the elevators attached to the horizontal stabilisers
Via hinge fitting to the fixed trailing edge
What is a faying seal
Where two pieces of material overlap and sealed on the joining pieces
What is a fillet seal
This seal allow metal to metal connection and sealed along the edge
How does the pylon transfer the loads generated by thrust to the airframe
Via the wing spars
Where are the main gear normally attached on many aircraft
The wing spars or a framework attached to the spars
What conditions will allow the cargo loading system to receive power
Door fully open
Electrical power available
Control panel switch selected to on
Where are the door pressure stop fittings located
Located on the door frame and transfer the loads to the surrounding structure
How are pressure door seals inflated
With spaced holes along the seal on the cabin side
Which aircraft are required to be equipped with an approved flight crew compartment door to resist small arms fire, grenade shrapnel and forcible intrusion
Aeroplanes over 45,500 Kg or a passenger seating capacity of over 60
What type of door is the bulk cargo door
Plug door type
What would happen if one of the door proximity devices failed
The flight crew get an indication of an unsafe door. This will have to be rectified be for next flight
How are windscreen heated
A conductive lamination included in the windscreen
What has occurred if you can see a shiny flat bubble in a flight deck window
Delamination
What type of chips occur in windscreens
Circular chips - do not usually decrease the structure qualities
V chips - can cause a window failure
What should you ensure with a bladder tank
They are required to stay wet
What is a wet wing
A wing with integral fuel tanks
What should you do after a repair or repaint to a flying control
Rebalancing
How is an engine isolated from the wing or fuselage when on fire
The engine is isolated by barrier firewalls or fire shields in the nacelles
How long should firewall materials and fittings resist flame penetration
15 mins
How are some turbine engines mounted to the pylon
Two mounts to support the forward end and one mount for the rear eand
What loads do the Turbine Isolation Engine Mounts carry
Forward mounts carry Verticle, side and axial (thrust) loads and permit thermal expansion of the engine.
Rear mounts take vertical and side loads and allow for thermal expansion with out applying axial loads
