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M15 GTE > Fuel systems > Flashcards

Fuel systems Flashcards

1
Q

What are the two systems in fuel

A

Primary & secondary

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2
Q

What’s the primary system used for

A

Store fuel

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3
Q

Where does secondary system supply fuel to and what does it control

A

Supply fuel to combustion chamber & control fuel quantity for all operating conditions of engine

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4
Q

What can the secondary fuel system split into

A

Fuel distribution and fuel control

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5
Q

What are the fuel distribution tasks

A

Safe supply to combustion chamber

Pressurise fuel so it can be vaporised into combustion chamber

Heat the fuel to prevent ice build up to allow flow

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6
Q

HP Pump pressure

A

900psi

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7
Q

Overpressure relief

A

1250psi

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8
Q

What does the LP pump do

A

Ensures HP pump don’t draw fuel from tanks by suction

Prevents cavitation

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9
Q

What does the metering section do

A

Returns unused fuel via bypass

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10
Q

How is bypass fuel used

A

Cool the IDG oil cooler

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11
Q

What type of component is a turbofan engine fuel control unit

A

Hydro mechanical

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12
Q

How are control functions done in a hydromechanical fuel control unit

A

Fluid pressures and mechanical components

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13
Q

What fuel control unit is used on modern turbofan engines

A

Constant trust fuel control units

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14
Q

In a thrust lever signal how does mechanical deflection occur

A

By rack and pinion transmission or rods and levers

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15
Q

N2 signal

A

Speed feedback transmitted by mechanical shaft from main fuel pump

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16
Q

N1 signal

A

Fuel pressure signal from hydromechanical speed sensor

17
Q

How does fuel control unit receive signals

A

Via air sense lines

18
Q

What do pressure sensors in fuel control unit convert

A

Convert pressure signals into mechanical signals

19
Q

What 3 signals do hydromechanical fuel control units use

A

Hydraulic , mechanical and pneumatic signals

20
Q

What sections is the fuel control unit split into

A

Fuel metering and computing section

21
Q

What are the two parts of the computing section

A

Governing and limiting

22
Q

Three tasks of fuel control units

A

Fuel metering

Power control

Engine protection

23
Q

What does the metering section do

A

Make se sure necessary fuel gets to the fuel nozzles

And retunes fuel via bypass

24
Q

What does the governing section

A

Makes sure selected power is controlled

25
Q

What does the limiting section do

A

Make sure engine operates in safe limits

26
Q

What is the heart of the FADEC system

A

Digital computer called ECU or EEC

27
Q

Why do the terms FMU and HMU have no C in the acronym

A

They aren’t controlling units

28
Q

FADEC haves a hydromechanical fuel control unit installed true or false

A

False

29
Q

What is the FADEC system located

A

Fan stator case

30
Q

Where does the power supply for FADEC come from

A

Aircraft or small permanent magnet alternator

31
Q

ECU tasks

A

Fuel metering and engine limit protection

32
Q

Another ECU task

A

Full power management & gives optimum thrust control for all operating conditions

33
Q

What does the engine interface unit do

A

Transmit data between FADEC and aircraft

Control power supply from aircraft to the ECU

M15 GTE (19 decks)

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