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Willy Flashing 15 X > 15.11 Fuel Systems > Flashcards

15.11 Fuel Systems Flashcards

1
Q

What are the requirements for fuel systems?

A

-increase decrease power
-adapt for changes for ambient pressure or temperature
-respond to rapid acceleration demands

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2
Q

What is the hydro mechanical/ electronic fuel control?

A

A hybrid of the two types of control but can be set to purely hydro mechanical.
Input/ output is electronically controlled fuel flow is set by servo motors

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3
Q

How does FADEC function?

A

-uses electronic inputs
-fuel flow is electronically outputted

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4
Q

What are the two sections of hydromechanical fuel control?

A

Computing
Monitoring

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5
Q

Which fuel control systems require no electric interface?

A

Hydro mechanical

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6
Q

What is one disadvantage of hydromechanical fuel control?

A

It is not as accurate

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7
Q

in a hydromechanical electronic fuel system what type of system does a more advanced electronic control system use to adjust fuel flow?

A

a remotely located electronic engine control

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8
Q

what is the function of the engine fuel system?

A

-pressurise the fuel
-meter fuel flow
-deliver atomised flow

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9
Q

in a hydromechanical electronic fuel control system what controls fuel flow to the combustion section?

A

the hydromechanical fuel control assembly

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10
Q

what does the hydromechanical fuel section have?

A

a fuel shut off section and a fuel metering unit

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11
Q

what does the vane type fuel pump give?

A

a fixed displacement pump which provides high pressure fuel

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12
Q

what gives indication of filter bypass valve activation?

A

a differential pressure indicator

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13
Q

on a hydromechanical electric type what is fuel metering provided to?

A

the EFCU

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14
Q

what do the engine generated control signals include?

A

-fan spool speed
-inner turbine temp
-fan discharge temp
-compressor discharge pressure

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15
Q

what is the engine mounted power levers purpose on a hydro mechanical electrical fuel systems?

A

it receives electrical signal from the throttle lever

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16
Q

where are engine generated and aircraft generated control signals sent to?

A

EFCU

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17
Q

where is the EFCU mounted in the hydro mechanical electrical fuel system?

A

the airframe

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18
Q

what is the FADEC?

A

full authority digital electronic control

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19
Q

what does the FADEC use to sense engine parameters?

A

electronic sensors

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20
Q

where is information sent to on the FADEC?

A

EEC

21
Q

what are the two channels contained by the EEC?

A

Channel A
Channel B

22
Q

how are EEC channels stored and where?

A

they are physically separated and cooled by convection

23
Q

what supplies the EEC with a signal in proportion with thrust lever position in the FADEC?

A

throttle lever angle resolver

24
Q

what does cross talk logic provide in FADEC systems?

A

Channel A & B

25
Q

where is the fuel metering unit mounted on the FADEC?

A

on the face of the gearbox and fuel pump

26
Q

what does the EEC provide position feed back engine components using?

A

-RVDT
-LVDT
-Thermocouples

27
Q

what does the programming plug do in the FADEC?

A

it selects proper software in the EEC for the engine thrust rating

28
Q

what is the primary and secondary fuel system?

A

primary - stores
secondary - supplies

29
Q

what is the function of the recirculation valve?

A

to cool fuel in preparation for it being pumped back into the fuel tank

30
Q

what is the function of the servo heater?

A

to heat fuel more if necessary

31
Q

what is the function of the return bypass line?

A

bypass excess fuel

32
Q

what are the two types of engine driven pumps?

A

constant displacement
non constant displacement

33
Q

where would a non constant displacement pump be used?

A

inlet of the engine driven pump

34
Q

how is the fuel pump lubricated?

A

by fuel passing through the pump

35
Q

what is the low pressure filter installed to prevent?

A

to protect the engine driven fuel pump

36
Q

where is the high pressure filter installed?

A

between fuel pump and fuel control

37
Q

where is the low pressure filter installed?

A

between supply tanks and the engine fuel systems

38
Q

which filter is the highest filtering capacity?

A

the micron filter

39
Q

what are the two most common filters?

A

-200 mesh & 35 mesh micron

40
Q

what does the single fuel manifold do?

A

supplies fuel to each nozzle

41
Q

what is the use for a shroud?

A

it carrys leaks to the fuel mast

42
Q

what are the two methods to protect fluid lines against leaks?

A

shrouded connections
doubles seal connections

43
Q

on older aircraft how did fuel leak protection differ?

A

there were two fuel supply lines and two fuel manifolds
-primary supplied the primary fuel line and the secondary supplied the secondary

44
Q

how do duplex and simplex nozzles differ?

A

duplex usually require dual manifolds

45
Q

why are two sets of simplex nozzles usually required?

A

one for a smaller discharge at idle speeds and one with a larger orifice for accelerations to max

46
Q

how do dual flow nozzles differ?

A

they contain two nozzles in one component

47
Q

what is the function of a check valve in a fuel nozzle?

A

to prevent carbon build up

48
Q

when is fuel likely to be pumped back to the tank?

A

in low pressure modes

49
Q
A

Willy Flashing 15 X (18 decks)

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