11.3 - Structures

Question 1

What is the primary function of the fuselage frames

Answer 1

To maintain the shape of the fuselage and to carry and distribute shear and tension loads

Question 2

What is the purpose of the dorsal fin

Answer 2

to join the fin smoothly to the fuselage

Question 3

What is the purpose of the sliding cockpit window

Answer 3

To provide a crew emergency exit and to give direct vision of the ground

Question 4

What is the main function of the passenger door torque tube

Answer 4

to rotate the door to the cocked position

Question 5

What are the main structural components in an aircraft wing

Answer 5

Ribs, Spars, Stringers and skin

Question 6

What is the mainframe of the wing designed to do

Answer 6

Transmit loads to the fuselage structure

Question 7

How can the front spar of the horizontal stabilizer be accessed

Answer 7

from the front by removing the removable leading edge

Question 8

Which of the following statements are true

Answer 8

Stabilizers, both vertical and horizontal are outside of the fuselage pressurized area

Question 9

What is the purpose of a failsafe bolt on the control surface hinges

Answer 9

to provide a safety method of maintaining structural integrity should one of the internal or external parts of the bolt be damaged

Question 10

What loads are transmitted by the pylon bearings

Answer 10

Lateral and longitudinal loads between the wing and pylon

Question 11

What is the purpose of the wing to nacel fairings

Answer 11

To provide an aerodynamic profile to reduce drag

Question 12

How is an engine pylon attached to the wing

Answer 12

2 links at the front and a Pair of shackles at the rear

Question 13

What is the purpose of a vent hole in the inner pane of the cabin window

Answer 13

To equalise the pressure between the two panes and the cabin

Question 14

How are the cockpit windows and windscreens installed

Answer 14

Externally onto the aircraft frame structure

Question 15

What is the function of a stringer

Answer 15

It gives shape to the fuselage shell and carries, bending, shearing, torsion and cabin pressure

Question 16

Which wing components are normally used to attach the leading and trailing edges

Answer 16

Vertical stiffners attached wing spar webs

Question 17

Which loads are mainly carried to the fuselage structure by the wing upper skin panels

Answer 17

Compression loads

Question 18

Which statement is correct for the fan cowl support beam

Answer 18

It supports the fan cowl and transmits the loads to the pylon torque box

Question 19

Which components go together to form a nacelle strut assembly

Answer 19

Frames, skins and structure

Question 20

What does the girt mechanism do

Answer 20

It engages or disengages the girt bar when the mode selector lever is placed in either manual or automatic

Question 21

On airbus aircraft, how is the girtbar checked for engagement and disengagement

Answer 21

It can be checked by visual indicators at floor level

Question 22

What does the center wing box support

Answer 22

It supports the fuselage, left wing box and right wing box

Question 23

What is the function of the horizontal stabiliser

Answer 23

To provide pitch trim control

Question 24

What is the function of the rudder

Answer 24

To provide directional control

Question 25

Why is it necessary to balance the ailerons with additional weight

Answer 25

To achieve static weight balancing

Question 26

Where would movable rudders be attached

Answer 26

On the trailing edge of the fin

Question 27

What is the purpose of the firewalls within the pylons

Answer 27

They prevent fire from propagating to other areas

Question 28

What is an engine mount

Answer 28

The engine attachment to the pylon

Question 29

What is the function of the keel beam

Answer 29

It supports the wheel well area where a maximum amount of bending may occour

Question 30

Areas of an aircraft’s structure that is difficult or impossible to seal after assembly are sealed using which of the following methods

Answer 30

Faying surface seals

Question 31

What is the purpose of the dorsal fin

Answer 31

To create a smooth, aerodynamic join between the fin and the fuselage

Question 32

How are the elevators attached to the horizontal stabilisers

Answer 32

Via hinge fitting to the fixed trailing edge

Question 33

What is a faying seal

Answer 33

Where two pieces of material overlap and sealed on the joining pieces

Question 34

What is a fillet seal

Answer 34

This seal allow metal to metal connection and sealed along the edge

Question 35

How does the pylon transfer the loads generated by thrust to the airframe

Answer 35

Via the wing spars

Question 36

Where are the main gear normally attached on many aircraft

Answer 36

The wing spars or a framework attached to the spars

Question 37

What conditions will allow the cargo loading system to receive power

Answer 37

Door fully open Electrical power available Control panel switch selected to on

Question 38

Where are the door pressure stop fittings located

Answer 38

Located on the door frame and transfer the loads to the surrounding structure

Question 39

How are pressure door seals inflated

Answer 39

With spaced holes along the seal on the cabin side

Question 40

Which aircraft are required to be equipped with an approved flight crew compartment door to resist small arms fire, grenade shrapnel and forcible intrusion

Answer 40

Aeroplanes over 45,500 Kg or a passenger seating capacity of over 60

Question 41

What type of door is the bulk cargo door

Answer 41

Plug door type

Question 42

What would happen if one of the door proximity devices failed

Answer 42

The flight crew get an indication of an unsafe door. This will have to be rectified be for next flight

Question 43

How are windscreen heated

Answer 43

A conductive lamination included in the windscreen

Question 44

What has occurred if you can see a shiny flat bubble in a flight deck window

Answer 44

Delamination

Question 45

What type of chips occur in windscreens

Answer 45

Circular chips - do not usually decrease the structure qualities V chips - can cause a window failure

Question 46

What should you ensure with a bladder tank

Answer 46

They are required to stay wet

Question 47

What is a wet wing

Answer 47

A wing with integral fuel tanks

Question 48

What should you do after a repair or repaint to a flying control

Answer 48

Rebalancing

Question 49

How is an engine isolated from the wing or fuselage when on fire

Answer 49

The engine is isolated by barrier firewalls or fire shields in the nacelles

Question 50

How long should firewall materials and fittings resist flame penetration

Answer 50

15 mins

Question 51

How are some turbine engines mounted to the pylon

Answer 51

Two mounts to support the forward end and one mount for the rear eand

Question 52

What loads do the Turbine Isolation Engine Mounts carry

Answer 52

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

Question 53

What is the role of torque tubes in a door locking mechanism?

Answer 53

When the door handle is turned, the latching crank rotates. The rotation of the latching crank is transmitted to the upper and lower torque tubes The rotation of the torque tubes is transmitted to the upper and lower gates by the designated control rods.

Question 54

What happens to the cockpit door when the cabin depressurises in flight?

Answer 54

It opens to allow rapid pressure release

Question 55

On a fuel tank panel, what is the aluminium gasket used for?

Answer 55

Electrostatic bonding

Question 56

To attach the pylon to the wing, how many fittings are there?

Answer 56

2 forward and 1 aft ##Footnote The forward ones are connected to the front spar with a pair of twin links and the aft one is connected to the wing beam with bolts

Question 57

In the pylon, what is classified as the primary structure?

Answer 57

Torque box

Question 58

What do the pylon bearings do?

Answer 58

Transmit lateral and longitudinal loads between the pylon and the wing ##Footnote Engages a spigot which is fixed to the lower wing

Question 59

In firewall regulations, how long should the materials and fittings resist flame penetration?

Answer 59

15 mins

Question 60

For omni directional handling of the ULD’s, whats system is used?

Answer 60

Ball matt