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Turbines 2 > Fuel/Anti-Stall > Flashcards

Fuel/Anti-Stall Flashcards

1
Q

Primary Function of the Turbine Engine FUEL system:

A

provide engine with the correct amount of fuel flow for all operating conditions.

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2
Q

It may also be used as servo pressure (muscle pressure) for secondary functions such as Anti-Stall Systems actuation (vbv, vsv), active clearance control operation, as well as for Oil Cooling (Engine or CSD/IDG oil).

A

HP engine fuel

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3
Q

What ATA chapter if the fuel is in the WING FUEL TANK/BOOSTER PUMP?

A

ATA 28

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4
Q

What ATA chapter if the fuel is in the Engine?

A

ATA 73

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5
Q

It cuts off fuel supply to the engine

It is controlled by ENGINE FIRE HANDLE

Also controlled by fuel/ign switch in some aircraft

A

SOV (Spar Valve)

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6
Q

____ stage pump boosts fuel flow thru fuel heater (fuel/oil heat exchanger) and can also suction fuel from wing tank.

A

1st stage pump/impeller pump

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7
Q

the _____ stage delivers high press fuel to FCU.

A

2nd stage / gear pump

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8
Q

Where can you find the fuel pump?

A

at the AGB attached to FCU

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9
Q

3 modes of Fuel heater:

A

Hot

Cold

Bypass

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10
Q

What does fuel heater uses to heat the fuel?

A

hot engine oil - to prevent ice formations entering the FCU

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11
Q

Type of filter that consist of metal screen discs and withstands HP.

A

Wafer Screen

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12
Q

Type of filter that is made up of wire screen and often formed into cone. Used in uncritical areas.

A

Plain mesh

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13
Q

Type of filter named after the particle unit.

A

Micron filter

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14
Q

Filters often have a _______ _______ switch installed to provide flight deck indication of Fuel Filter Clogging

A

differential pressure

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15
Q

______ controls the flow of fuel to the required quantity necessary for engine operating conditions (starting, decel/acceleration, cruise, take-off, landing, shut-down, emergency).

A

FCU

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16
Q

4 types of FCU

A

1) Hydro-Mechanical
2) Hydro- Pneumatic
3) Supervisory E.E.C.
4) Electronic (F.A.D.E.C)

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17
Q

Type of FCU that uses flyweight governor, cables, pushrods etc. It meters fuel to the combustion chamber iaw power demand.

A

Hydro-Mechanical

18
Q

Type of FCU that uses 2 speed governors and is used for turboprop and turboshaft engines. Also for turbofan engines.

Uses air and fuel pressures to meter fuel

N1 governor for compressor turbines speed and N2 for power Turbine speed.

A

Hydro-Pneumatic

19
Q

adds FADEC technology to Hydro Mechanical system (HYBRID) and not common but still found

EEC (Electronic Engine Control) operates as a limiter to prevent engine paratmeters such as tem and rpm from being exceeded.

A

EEC FCU System/Electronic Hydro-Mechanical

20
Q

The “Dual Channel” FADEC EEC is the main and central component, it is installed on the Fan case. 1 channel manages the _____, other is in _____ ______.

A

engine, standby mode

21
Q

The _____ meters fuel iaw commands from the EEC, it is istalled on the AGB.

A

HMU

22
Q

EEC has a dedicated ______ that is driven by the AGB.

A

alternator

23
Q

2 Functions associated with HMU: (HMU is fully commanded by the EEC)

A

Fuel Metering

Servo Control

24
Q

The ____ (aka ECU) does all computing and commands HMU.

A

EEC

25
Q

How does fuel flow indicated?

A

weight per hr

26
Q

Type of nozzle that has 2 supply lines and 2 spray patterns at the fuel nozzle, designated Primary (inner) and Secondary (outer main) flow.

A

Duplex nozzle

27
Q

______ _______ delivers fuel to the nozzles.

A

fuel manifold

28
Q

________ nozzles can be either single conical spray or dual conical spray (Primary & Secondary flows), a flow divider is built into the fuel nozzle.

A

Simplex

29
Q

______ _______ (Fuel Pressurizing and Dump Valves), aka flow dividers, serve 2 functions:

  1. schedule (divide) primary & secondary fuel flow to the duplex fuel nozzles
  2. provide positive fuel cutoff at engine shutdown by draining fuel from the fuel supply manifold(s
A

P&D valves

30
Q

What is the purpose of draining fuel at Engine Shutdown?

A

Reduce the risk of a tailpipe fire due to residual fuel burning after engine is shut down (or next engine start)

Prevent carbon buildup in the fuel nozzles

31
Q

2 types of drain valves:

A

Fuel Manifold Dump valve - located at the low points of fuel manifold

Combustor Drain Valve - runs thru a P&D valve and recovered for next engine start

32
Q

gas turbine fuel:

A
33
Q

Compressor Anti-Stall systems:

A

Variable Bleed Valves

Bleed bands

Variable inlet guide vanes

Variable stator vanes

Transient bleed valves

34
Q

Anti-stall system located outside case of the compressor.

It opens and closes ports in the compressor case spilling INTERSTAGE COMPRESSOR AIR.

A

Variable bleed valves

35
Q

What is the position of VBV?

A

Closed

36
Q

Figure of an open VBV.

A
37
Q

What will happen if primary orifice on the VBV is blocked?

A

bleed valve will stay open longer

38
Q

It is similar to the bleed valve except that with this system, air is bled from the rear stages of the compressor through the use of a band around the compressor, rather than a single valve.

A

Variable bleed bands

39
Q

Type of bleed valves that are frequently used on Large turbofan engines and operated by FADEC and EEC.

They are located on the last stage of the high pressure compressor and vent excess high pressure air back into the engine at the first stage turbine vanes.

A

Transient bleed valves

40
Q

A mechanical action that changes the airflow coming into the compressor ______, or the airflow within the compressor ______.

A

VIGV, VSV

Turbines 2 (12 decks)

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