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M15 Ryan > M15.11 > Flashcards

M15.11 Flashcards

1
Q

What are the 2 subsystems of the fuel system?

A

Fuel distribution
Fuel control

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2
Q

What are the 3 main tasks of the fuel distribution system?

A

Supply fuel to combustion chamber
Pressurise fuel
Heat fuel

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3
Q

What is the purpose of the LP pumps?

A

Ensures the HP pump doesn’t draw fuel from tanks by suction and prevents cavitation

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4
Q

How much pressure does the HP pumps provide?

A

900PSI

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5
Q

At what pressure do the over pressure relief valves operate at?

A

1250psi

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6
Q

Bypass oils is used for what?

A

To cool the IDG oil cooler

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7
Q

Why is cold fuel added to the hot bypass fuel?

A

So the fuel that enters the tank isn’t too hot

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8
Q

What is the hydro mechanical fuel control unit mounted to?

A

Engine fuel pump

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9
Q

How is control achieved in a hydro mechanical control unit?

A

By fluid pressure and mechanical components

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10
Q

What are the 2 types of fuel control unit?

A

Speed governed control unit (on old a/c)
Constant thrust control unit (modern a/c)

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11
Q

What does the speed generated control unit receive signals from?

A

N2 demand signal
N2 feedback signal

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12
Q

What does the constant thrust control unit receive signals from?

A

N2 demand signal
N2 feedback signal
N1 speed
Ambient pressure
Temp

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13
Q

What is the N2 speed signal transmitted by?

A

Via a mechanical drive shaft from the main fuel pump

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14
Q

What does the N1 signal come from?

A

The N1 speed sensor

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15
Q

What do temp signals come from?

A

Hydro mechanical temp sensor

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16
Q

FCU?

A

Fuel Control Unit

17
Q

What are the 4 signals for the FCU?

A

Throttle demand signals
Speed feedback signals
Temp signals
Pressure signals

18
Q

What are the 2 major sections of the FCU?

A

Fuel metering section
Computing section

19
Q

What is the computing section of the FCU split into?

A

Governing section
Limiting section

20
Q

What is the purpose of the metering section?

A

Ensures all the necessary fuel gets to the fuel nozzles

21
Q

What is the purpose of the governing section?

A

Ensures selected power is controlled

22
Q

What is the purpose of the limiting section?

A

Monitors the governing section and ensures engine operates within its safe limits

23
Q

FADEC?

A

Full Authority Digital Engine Control

24
Q

What is the FADEC?

A

A digital computer that has authority of engine control functions

25
Q

What is the FADEC usually called?

26
Q

FMU?

A

Fuel Metering Unit

27
Q

Where is the FMU usually located?

A

In the fan case

28
Q

What does the ECU do regarding thrust control?

A

Gives optimum thrust for all operating conditions

29
Q

EIU?

A

Engine Interface Unit

M15 Ryan (17 decks)

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