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Mod 11 > 11.3 - Structures > Flashcards

11.3 - Structures Flashcards

Structures

1
Q

What is the primary function of the fuselage frames

A

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

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2
Q

What is the purpose of the dorsal fin

A

to join the fin smoothly to the fuselage

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3
Q

What is the purpose of the sliding cockpit window

A

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

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4
Q

What is the main function of the passenger door torque tube

A

to rotate the door to the cocked position

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5
Q

What are the main structural components in an aircraft wing

A

Ribs, Spars, Stringers and skin

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6
Q

What is the mainframe of the wing designed to do

A

Transmit loads to the fuselage structure

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7
Q

How can the front spar of the horizontal stabilizer be accessed

A

from the front by removing the removable leading edge

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8
Q

Which of the following statements are true

A

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

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9
Q

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

A

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

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10
Q

What loads are transmitted by the pylon bearings

A

Lateral and longitudinal loads between the wing and pylon

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11
Q

What is the purpose of the wing to nacel fairings

A

To provide an aerodynamic profile to reduce drag

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12
Q

How is an engine pylon attached to the wing

A

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

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13
Q

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

A

To equalise the pressure between the two panes and the cabin

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14
Q

How are the cockpit windows and windscreens installed

A

Externally onto the aircraft frame structure

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15
Q

What is the function of a stringer

A

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

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16
Q

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

A

Vertical stiffners attached wing spar webs

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17
Q

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

A

Compression loads

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18
Q

Which statement is correct for the fan cowl support beam

A

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

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19
Q

Which components go together to form a nacelle strut assembly

A

Frames, skins and structure

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20
Q

What does the girt mechanism do

A

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

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21
Q

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

A

It can be checked by visual indicators at floor level

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22
Q

What does the center wing box support

A

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

23
Q

What is the function of the horizontal stabiliser

A

To provide pitch trim control

24
Q

What is the function of the rudder

A

To provide directional control

25
Q

Why is it necessary to balance the ailerons with additional weight

A

To achieve static weight balancing

26
Q

Where would movable rudders be attached

A

On the trailing edge of the fin

27
Q

What is the purpose of the firewalls within the pylons

A

They prevent fire from propagating to other areas

28
Q

What is an engine mount

A

The engine attachment to the pylon

29
Q

What is the function of the keel beam

A

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

30
Q

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

A

Faying surface seals

31
Q

Which of these statements about the wing boxes are correct

A

The right and left wing box are supported by the centre wing box

32
Q

What is the purpose of the dorsal fin

A

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

33
Q

How are the elevators attached to the horizontal stabilisers

A

Via hinge fitting to the fixed trailing edge

34
Q

What is a faying seal

A

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

35
Q

What is a fillet seal

A

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

36
Q

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

A

Via the wing spars

37
Q

Where are the main gear normally attached on many aircraft

A

The wing spars or a framework attached to the spars

38
Q

What conditions will allow the cargo loading system to receive power

A

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

39
Q

Where are the door pressure stop fittings located

A

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

40
Q

How are pressure door seals inflated

A

With spaced holes along the seal on the cabin side

41
Q

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

A

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

42
Q

What type of door is the bulk cargo door

A

Plug door type

43
Q

What would happen if one of the door proximity devices failed

A

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

44
Q

How are windscreen heated

A

A conductive lamination included in the windscreen

45
Q

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

A

Delamination

46
Q

What type of chips occur in windscreens

A

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

47
Q

What should you ensure with a bladder tank

A

They are required to stay wet

48
Q

What is a wet wing

A

A wing with integral fuel tanks

49
Q

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

A

Rebalancing

50
Q

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

A

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

51
Q

How long should firewall materials and fittings resist flame penetration

A

15 mins

52
Q

How are some turbine engines mounted to the pylon

A

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

53
Q

What loads do the Turbine Isolation Engine Mounts carry

A

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

Mod 11 (21 decks)

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