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Module 15 > 15.19 Powerplant Installation > Flashcards

15.19 Powerplant Installation Flashcards

1
Q

What is referred to as a power plant?

A

The engine and its accessories, including the gearbox, fuel control, intake cowling, exhaust, thrust reverser assembly, fire protection equipment, sensors, generators, ducting, wiring, cowling, mounts, control cables and rods, drains and firewalls

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2
Q

What is the most common power plant installation?

A

Wing mounted

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3
Q

What is a firewall?

A

A firewall is a partition between the engine powerplant installation and the aircraft

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4
Q

What is the function of a firewall?

A

Its function is to isolate the powerplant from the airframe structure in case of fire and the heat created during normal engine operation

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5
Q

What are firewalls made out of?

A

Sheet metal shields made from stainless steel or some other high heat resistant metal

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6
Q

The engines, struts and pylons have zones what could these zones be?

A

fire zone, flammable fluid leakage zone, or dry bay zone, according to the potential for the presence of flammable fluids and ignition sources

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7
Q

Fire zones are classified based on what?

A

compartments that contain ignition sources and the potential for flammable fluid leakage are classified as fire zones

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8
Q

How are fire zones isolated?

A

Firewalls

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9
Q

What are some examples of fire zones?

A

Examples are the engine case around the compressor, combustor, and turbine sections of the engine

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10
Q

Why do helicopters use firewalls?

A

Helicopters utilise the firewalls to ensure the engine is separated from the adjacent engine or the main gearbox section

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11
Q

Why are there cowls on the engine?

A

To protect the engine and its accessories from the operating environment and to provide a streamlined, aerodynamic surface

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12
Q

What are the cowlings also for?

A

Also designed to route cooling air effectively around the engine and its components

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13
Q

When designing cowlings what is kept in mind?

A

Ease of access for maintenance

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14
Q

What are the thrust reversers cowls commonly referred to as?

A

C duct cowls

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15
Q

How must the engine be mounted?

A

In a way that the weight of the engine and thrust developed is transmitted to the aircraft structure and the mountings

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16
Q

With the temperature ranges what do the mounts need to allow?

A

For expansion in both radial and axial directions

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17
Q

On side-mounted engines, the front and rear saddle-type beams connect the engine through fillets to the airframe how are they connected to the engine?

A

The beams are connected to the engine mounting points by swinging links and thrust trunnions, with a thrust strut connected to the airframe

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18
Q

How are pylon mounted engines mounted to the pylon?

A

Connected with front and rear brackets attached to links at the top front and rear of the engine

19
Q

Where are the mounting points on the engine?

A

The actual mounting points on the engine are usually located at the front, on the compressor casing and at the rear on the exhaust/turbine casing

20
Q

What loads forward engine mounts carry?

A

Vertical, side and axial (thrust) loads and allow engine growth due to thermal expansion

21
Q

What loads do aft mounts carry?

A

Vertical and side loads only

22
Q

What do the main mounting bolt/trunnion assemblies have?

A

They often have spherical bearings to allow for expansion and torque, some engines use a form of rubber bushing to absorb vibration, such as the Auxiliary Power Unit (APU) and turboshaft engines

23
Q

What do you have to ensure when replacing or repairing a fuel line?

A

That all fittings are compatible with their mating parts

24
Q

What is it essential fuel lines don’t chafe against?

A

Control cables, airframe structure or meet electrical wiring

25
Q

Where you can’t separate fuel lines and electrical wiring what should you do?

A

Ensure the fuel line is below the wiring and clamp it securely to the airframe structure

26
Q

What do you always need to ensure for hydraulic lines?

A

There is no leaks, scratches, kinks, cracks, burrs

27
Q

What do you need to ensure with hydraulic lines and hoses?

A

That they do not chafe against one another and are correctly secured and clamped

28
Q

What do you need ti do when replacing flexible lines?

A

Use the same type, size, part number and length of hose

29
Q

What do you need to avoid in flexible lines because they cause failure!

A

Tight bend

30
Q

Where must wire bundles be routed?

A

Wire bundles must be routed in accessible areas that are protected from damage and maintenance activity

31
Q

Where must wire bundles not be routed?

A

They must not be routed in areas where they are likely to be used as handholds or as support for personal equipment or where they are likely to become damaged during the removal of aircraft equipment

32
Q

Why must wiring be clamped?

A

Must be clamped so that contact with equipment and structure is avoided

33
Q

What must you do if you want clamp the wires?

A

Where this cannot be accomplished, extra protection, in the form of grommets and chafe strips must be provided

34
Q

What can you do to prolong deterioration of insulation?

A

Wiring must be routed away from high-temperature equipment and lines

35
Q

What must happen to wiring routed across hinged panels?

A

They must be routed and clamped so that the bundle will twist, rather than bend, when the panel is moved

36
Q

What is the minimum radii for bends?

A

Bends in wire groups or bundles must not be less than 10 times the outside diameter of their largest wire

37
Q

Where would control cable and rods be used on powerplants?

A

Used on many power plant installations to activate accessories such as the fuel control unit

38
Q

How should you lift an engine?

A

Only via the dedicated lifting points and are used to raise and lower the engine into position

39
Q

Why can you find drains in the power plant?

A

To drain various fluids from the power plant, some are for malfunction and some are designed for normal operation if the engine

40
Q

Why do you need to inspect the drains?

A

Ensure they are open and clear of debris

41
Q

What are the man in components of the drain system?

A

The drain lines which collect the fluids
Module assembly where all the drain lines end

42
Q

Where are the drains located?

A

Lower part of the module and consists of the drain mast

43
Q

What do the drain lines do?

A

Collect fluids and vapour from any point where lines and components may leak, or where fluid can accumulate in cavities

44
Q

What are some typical areas drain lines are used?

A

The pylon
The area of fuel-operated components such as the variable bleed valve and variable stator vane actuators and servo valves
The oil tank scupper
The bearing sump seal drains
The fuel-oil heat exchanger
Many components on the accessory gearbox

Module 15 (18 decks)

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