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Module 15 > 15.19 > Flashcards

15.19 Flashcards

1
Q

Why would you use fuselage mounted power plants?

A

Thrust is close to the longitudinal axis

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2
Q

What is a firewall?

A

A partition between the engine and the aircraft

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3
Q

What are firewalls made out of?

A

Sheet metal shields made from stainless steel or any other heat resistant material

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4
Q

What two things form compartments?

A

Pylons and struts as well as engines

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5
Q

Why do engine pods in cooperate zones?

A

To minimise probability and spread of a fire

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6
Q

What are classified as fire zones?

A

Areas where ignition sources are present, and flammable fluid can leak

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7
Q

What else are isolated by firewalls?

A

Areas adjacent to the engine fire zone

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8
Q

Helicopters use firewalls to ensure that the engine is separated from what?

A

The gearbox or adjacent engines

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9
Q

What are the cowlings insulated with?

A

Fire resistant sheet foam

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10
Q

What are cowlings used in conjunction with to create a compartment designed to contain any fires or catastrophic?

A

Firewalls

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11
Q

What are fan and thrust reverser cowls used to do?

A

Protest engine from environment
Streamlines area
Designed to route cooling air around the engine and the components

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12
Q

What are the cowls constructed for mainly?

A

Ease of access

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13
Q

What is the cowling attached to?

A

The nacelle support frame

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14
Q

His is the cowling secured on the nacelle support frame?

A

On the 6 o’clock centreline by latches

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15
Q

What does the hinged cowl provide access to?

A

The engine core

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16
Q

What are the C duct also another name for?

A

The thrust reverser cowls

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17
Q

Once opened what are the C ducts supported by?

A

Hold-open rods

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18
Q

What are nacelles connected to the mounting strut by?

A

Hinge pins and stay fitted during engine removal

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19
Q

What are nacelles connected to the mounting strut by?

A

Hinge pins and stay fitted during engine removal

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20
Q

What can the translating sleeve be moved back and forth by?

A

Manually or by power when functional checks are required

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21
Q

What type of engine are acoustic panels used on?

A

High bypass ratio engines

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22
Q

What do acoustic panels utilise?

A

Noise absorbent liners around the inside wall of the bypass duct

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23
Q

Disadvantages of acoustic liners?

A

Add weight
Friction so increase fuel consumption

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24
Q

What are the C ducts also another cowls limed with to contain the noise of turbine/exhaust ?

A

Honeycomb panels

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25
Q

In what direction must engine mounts allow expansion for?

A

Radial and axial

26
Q

What is the purpose of the engine mounts?

A

Weight and thrust is transmitted to the aircraft structure and mountings

27
Q

What is used to connect the side mounted engines to the rear and front saddle type beams?

A

Through fillets

28
Q

How are the beams connected to the engine mounting points?

A

By swinging links and thrust trunnions with a thrust strut connected to the airframe

29
Q

How are pylon mounted engines mounted to the pylon?

A

Front and rear brackets attached to links at the top, front and rear or the engine

30
Q

How are pylon mounted engines mounted to the pylon?

A

Front and rear brackets attached to links at the top, front and rear or the engine

31
Q

Where are the actual mounting points on a pylon mounted engine?

A

On the front (compressor casing)
In the rear (turbine casing)

32
Q

What loads do forward engine mounts take?

A

Vertical, side and axial (thrust) to allow for thermal expansion

33
Q

What loads do the aft mounts take?

A

Vertical and side

34
Q

What allows for expansion and torque in the main mounting bolt/trunnion?

A

Spherical bearings

35
Q

What does the rubber bushing absorb?

A

Vibration

36
Q

What are slinging points provided for?

A

Attachment of dedicated equipment for engine removal

37
Q

What must you do to a fuel line when being routed near wiring to prevent it from chafing when not connected?

A

Route it below the wiring and clamp it to airframe

38
Q

What must you avoid in flexible lines?

A

Tight bends

39
Q

Where must wire bundles not be?

A

Anywhere where they can be used as a handhold or support for equipment

40
Q

Wiring must be clamped low down for separation where?

A

Between the wire and the structure

41
Q

Where the wires will touch structure, what can be used to prevent chafing?

A

Grommets and chafe strips

42
Q

Where must wires not have a preload?

A

At corners and bends if grommets and chafe strips

43
Q

Why must protective flexible conduits be made from a specific material?

A

To prevent chafing of internal wiring and inner walls

44
Q

What must wiring be over hinged panels and why?

A

Wired and clamped to allow for twisting rather than bending

45
Q

What must wiring be over hinged panels and why?

A

Wired and clamped to allow for twisting rather than bending when the panel is moved

46
Q

What is the maximum radii for bends in wire groups or bundles?

A

Not less than 10 x the outside disaster if their largest wire

47
Q

What is the maximum radii for bends in wires?

A

Not more than 6 x their outside diameter in breakouts

48
Q

What is the maximum reverse direction?

A

6 x

49
Q

What components remain within the aircraft when removing it?

A

Control cables and rods

50
Q

Purpose of lifting points?

A

To safely lift up the weight of the engine

51
Q

When is damage to the engine or surrounding structures most commonly occurred?

A

When lifting from a location that’s not the lifting points.

52
Q

When is damage to the engine or surrounding structures most commonly occurred?

A

When lifting from a location that’s not the lifting points.

53
Q

When are drains used?

A

In malfunction or normal operation

54
Q

What does inspecting the drains achieve?

A

Open and clear from debris
Allows engineer to know where the debris is coming from

55
Q

What does inspecting the drains achieve?

A

Open and clear from debris
Allows engineer to know where the debris is coming from

56
Q

What are the main components of a drain system?

A

The drain lines which collect the fluid
The module assembly where the drain lines end

57
Q

What are the main components of a drain system?

A

The drain lines which collect the fluid
The module assembly where the drain lines end

58
Q

What does the lower part of the lower assembly consist of?

A

Drain mast

59
Q

What is the drain collector assembly also known as and what does it do?

A

The manifold module and it keeps fluid leaks in small tanks

60
Q

What does the drain line collect?

A

Fluid and vapour from points where lines may leak or where fluid can build up in cavities

Module 15 (18 decks)

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