Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

M15 Ryan > M15.11 > Flashcards

M15.11 Flashcards

1
Q

What are the 2 subsystems of the fuel system?

A

Fuel distribution
Fuel control

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

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

A

Supply fuel to combustion chamber
Pressurise fuel
Heat fuel

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

How much pressure does the HP pumps provide?

A

900PSI

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

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

A

1250psi

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Bypass oils is used for what?

A

To cool the IDG oil cooler

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Why is cold fuel added to the hot bypass fuel?

A

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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What is the hydro mechanical fuel control unit mounted to?

A

Engine fuel pump

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

How is control achieved in a hydro mechanical control unit?

A

By fluid pressure and mechanical components

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
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)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What does the speed generated control unit receive signals from?

A

N2 demand signal
N2 feedback signal

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What does the constant thrust control unit receive signals from?

A

N2 demand signal
N2 feedback signal
N1 speed
Ambient pressure
Temp

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What is the N2 speed signal transmitted by?

A

Via a mechanical drive shaft from the main fuel pump

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What does the N1 signal come from?

A

The N1 speed sensor

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What do temp signals come from?

A

Hydro mechanical temp sensor

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
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?

A

ECU

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)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions