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Module 15.11 Fuel systems Flashcards

1
Q

Quantity of fuel supplied must be automatically adjust for what?

A

Changes in ambient temperature or pressure

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2
Q

What are the 3 GTE fuel control systems?

A
  • Hydromechanical
  • Hydromechanical/electronic
  • FADEC
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3
Q

If fuel flow increases too, rapidly an over rich mixture can occur, this can cause what?

A
  • Rich blowout
  • Compressor stall
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4
Q

In the dual mode of the hydromechanically/electronic metering system, fuel flow is set by what?

A

Servo motors

Input + output are electronic

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5
Q

The fuel metering system must be able to do what?

A

Increase and decrease power

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6
Q

To provide the correct fuel for the engine, hydromechanical fuel controls have what two sections?

A

Computing and metering

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7
Q

A pure hydromechanical control system has no what? and is driven by what?

A
  • Electronic interface
    — accessory gearbox
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8
Q

What is the function of the engine fuel system?

A
  • Pressurise the fuel
  • Meter the fuel flow
  • Deliver atomised fuel to the combustion chamber
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9
Q

Fuel flow is controlled by what in hydromechanic control?

A

Hydromechanical fuel control assembly

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10
Q

The Hydromechanical fuel control assembly contains what two parts?

A
  • Fuel shut off section
  • Fuel metering section
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11
Q

The total engine fuel and control system contains what components?

A
  • Vane fuel pump
  • Filter bypass valve
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12
Q

What is the mechanical indication of bypass valve opening?

A

Pin extended

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13
Q

What does the EFCU stand for?

A

Electronic Fuel Control Unit

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14
Q

What does the EEC system consist of? (Hydromechanical)

A
  • Hydromechanical fuel control
  • EFCU
  • Aircraft mounted power lever angle (PLA) pentiometer
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15
Q

What are the engine generator control signals? (Hydromechanical)

A
  • Fan spool speed
  • Gas generator spool speed
  • Inner turbine temperature
  • Fan discharge temperature
  • Compressor discharge pressure
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16
Q

Where is the EFCU mounted?

A

Airframe

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17
Q

What does the PLA pentiometer transmit?

A

Electric signal of throttle lever position to the EFCU

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18
Q

The FADEC system uses electronic sensors to provide what?

A

Information to the EEC

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19
Q

What does the EEC do with the FADEC information?

A

Calculates amount of fuel flow by adjusting the fuel metering valve

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20
Q

What can be said about the two electronic channels in the EEC?

A
  • Physically separate
  • Cooled by convection
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21
Q

What provides the throttle lever position to the EEC in the FADEC system?

A

Throttle lever angle resolver

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22
Q

What does the cross talk logic do?

A

Compares data from channel A and B

23
Q

What does the primary EEC channel control?

A

All the output drivers

24
Q

Where is the fuel metering unit mounted in the FADEC system?

A

Front face of the gearbox and to the front of the fuel pump

25
The EEC provides position feedback for engine compartments by using what?
- RVDT - LVDT - Thermocouples
26
What does the programming plug do in FADEC?
Selects the proper software in the EEC for the engine thrust rating
27
What is the primary and secondary fuel system?
Primary - Stores fuel Secondary - Supplies fuel to engine
28
A non-constant displacement pump (Centrifugal) is used at inlet of the EDP to provide what?
Provide positive flow to the second stage of the pump (HP pump)
29
How is the fuel pump lubricated?
Fuel passing through the pump
30
Where is the LP filter?
Before the pump
31
Where is the HP filter?
After the pump
32
What are the 3 most common types of filter?
- Micron filter - Wafer screen filter - Plain screen mesh filter
33
What filter has the best filtering action?
Micron filter, 10-25 microns
34
What is the most common filter?
200 mesh and 35 mesh micron filters
35
GTE fuel systems are very susceptible to what?
Ice in the fuel filters
36
What does the fuel manifold do?
Distributes the fuel to the individual fuel nozzles
37
What manifold are most common on GTE's?
Single-fuel
38
Where is leaked fuel caught by the shroud drained to?
Engine drain mast
39
What are the methods of leak protection?
- Shrouded connection - Double sealed connection
40
On older aircraft they have how many supply lines and manifolds?
Two
41
What does the secondary manifold supply fuel to?
Secondary fuel nozzles
42
What are the two nozzle types?
- Simplex - Duplex
43
Duplex nozzles require what?
A duplex manifold
44
How can nozzles be mounted?
Internally or externally
45
What is the drawback of simplex nozzles?
Only good atomisation in a small fuel flow range
46
Using simplex, what is required for good atomisation across a wide fuel range?
- One set with a small discharge orifice (start to idle) - Secondary set with large discharge orifice (idle to max) (Old technology)
47
Duplex nozzles combine what?
Two nozzles in one component
48
Why is a check valve used in the fuel nozzle?
Prevent carbon formation
49
Fuel that is not required returns to the fuel pump via what line?
Bypass return line
50
Where is the fuel flow indicator located?
In between the Fuel control unit and the nozzles
51
Fuel to the LP pump is what psi?
40 psi
52
Fuel after the LP pump is what psi?
175 psi
53
Fuel after the HP pump is what psi?
1250 psi
54
Why is bypass return fuel mixed with LP pump outlet fuel in the recirculating valve before entering the engine?
To cool it down

Mod 15 flashcards (18 decks)

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