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M15 New > 15.11 > Flashcards

15.11 Flashcards

1
Q

How do you increase and decrease power needed for the required thrust output

A

Varying flow of fuel to the combustion chamber

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2
Q

What is rich blowout

A

When quantity of fuel becomes excessive limiting the temperature of blades exceeded

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3
Q

When does rich blowout occur

A

Not enough oxygen in air supply to support combustion

Excess fuel cools mixture to below combustion temperature

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4
Q

What is the function of fuel control systems

A

Match fuel flow to power requested by flight crew

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5
Q

Fuel control sections

A

Computing and metering

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6
Q

What does EEC stand for

A

Electronic engine control

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7
Q

How does the fadec system work

A

No hydromechanical fuel control back up system

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8
Q

How does the fadec system provide information

A

Electronic sensors to give engine parameter information to the EEC

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9
Q

What does the EEC do

A

Computer that controls the operation of the engine

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10
Q

What is the EEC placed

A

In part of the engine nacelle that is cool

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11
Q

How many channels does the EEC have

A

2 , A and B

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12
Q

What memory does the EEC have

A

Volitile and non-volitile to store performance and maintenance data

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13
Q

Where is the fuel metering unit located

A

Mounted on the front face of the gearbox

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14
Q

What does primary fuel system do

A

Store fuel

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15
Q

What does secondary fuel system do

A

Supplies fuel to the engine

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16
Q

What are the 2 parts of the fuel system

A

Distribution and control

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17
Q

3 tasks of fuel distribution system

A

Supply fuel from fuel system to combustion chamber

Pressurise fuel so it vapourises in the combustion chamber

Heat the fuel

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18
Q

How much does the low pressure fuel pump increase pressure to

A

175psi

19
Q

How much does the high pressure pump increase fuel pressure to

A

900 psi

20
Q

What are engine driven fuel pumps divided into

A

Constant displacement

Non-constant displacement

21
Q

What is a centrifugal pump

A

Non-constant displacement pump

22
Q

What is the boost stage of the engine driven pump

A

Where the output of the centrifugal is varied

23
Q

How is the fuel pump lubricated

A

Passing fuel through it

Never turn the pump on without a fuel flow supplied to the inlet

24
Q

Where is a low pressure filter

A

Between supply tanks and engine fuel system to protect engine driven fuel pumps

25
Q

Where is the high pressure filter

A

Between fuel pump and fuel control to protect fuel control from contaminants brought by low pressure pump

26
Q

3 types of filters used

A

Micron

Wafer screen

Plain screen mesh

27
Q

What filter has the greatest filtering action

A

Micron

Porous cellulose can remove FOD up to 10-25 microns

28
Q

What’s the most widely used filter

A

200 mesh

35 mesh micron filters

Used in fuel pumps and fuel controls

29
Q

What does the wafer type filer have

A

Replaceable element made of layers of screen disks

30
Q

What are mesh filters made of

A

Mesh steel wire

31
Q

What does the heat exchanger use to heat up fuel to stop water freezing

A

Engine bleed air or engine oil

32
Q

How do we protect connections in fluid lines against leaks

A

Shrouded connections

Double sealed connections

33
Q

What does a shrouded connection do

A

Doesn’t prevent a leak but catches leaks and carries them away by the engine drain system

34
Q

How many manifold does a simplex nozzle need

A

One

35
Q

How many manifolds does a duplex nozzle need

A

Dual manifold and pressuring valve or flow divider to divide primary and secondary main fuel flow

36
Q

What is external mounting

A

where a mounting pad is provided to attach nozzle to case or inlet air elbow

37
Q

What is internal mounting

A

At the liner dome the chamber cover is removed for replacement or maintenance of the nozzle

38
Q

What are primary fuel nozzles

A

Set of simple nozzles used for engine start up to idle speed

39
Q

What are secondary fuel nozzles

A

Second set of simplex nozzles used acceleration to maximum power

40
Q

What’s a duplex nozzle

A

Dual flow nozzles which combine the 2 simplex nozzles in one

41
Q

Why is a check valve used

A

Prevent carbon formation

42
Q

When does the check valve close

A

Fuel pressure in the manifold decreases after the hp fuel shut off valve is closed

43
Q

Why is it important for the check valve to close

A

So no fuel enters the combustion chamber from the manifold by gravity

44
Q

What does crosstalk logic do

A

Compares data from channels A and B

M15 New (18 decks)

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