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Powerplant (Class) 2 > Chapter 7 Section B - Engine Fuel Systems (Fuel Injection systems) > Flashcards

Chapter 7 Section B - Engine Fuel Systems (Fuel Injection systems) Flashcards

1
Q

What are the two limitations to carburetors?

A
  1. Because of the different length and shape of the intake manifold, there is a uneven fuel/air distribution
  2. They are susceptible to carburetor icing
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2
Q

When the fuel is injected directly into the combustion chamber, the injection system is referred to as what?

A

Direct fuel injection system

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3
Q

What is the most common type of fuel injection system used in reciprocating aircraft engines and it’s two types?

A

Continuous-flow fuel injection system

  • Precision Airmotive RSA system
  • Teledyne Continental Motors system
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4
Q

Name the four main components of the TCM continuous flow.

A

Engine driven fuel pump (the heart

F.C.U

Fuel Mianifold a.k.a Spider (ball valve)

fuel nozzle

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5
Q

Name two functions of a Direct Fuel Injection System.

A
  1. Pumps force metered fuel directly into the combustion chambers of the individual cylinder
  2. They are timed to the engine in high-pressure spurts
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6
Q

What are the two classifications of fuel injection systems?

A

Direct fuel

Continuous-flow

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7
Q

Fuel metering is accomplished by fuel flowing through both the _____and the ______.

A

Fuel metering is accomplished by fuel flowing through both the mixture control valve and the idle valve.

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8
Q

What is the procedure when starting a Lycoming engine equipped with a a fuel injection system?

A
  1. Boost pump on
  2. Throttle 1/2 inch open
  3. Mixture full rich for 3-5 seconds & watch fuel guage rise
  4. Mixture idle cut-off
  5. Crank engine, once started mixture goes full rich
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9
Q

What is the starting procedure when starting a Continental engine equipped with a fuel injection system?

A
  1. Boost pump on
  2. Throttle 1/2 inch open
  3. Mixture full rich
  4. Monitor fuel guage
  5. Crank engine
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10
Q

What is the difference between the RSA and the TCM systems when it comes to metering fuel?

A

RSA system uses both fuel and air metering forces to meter fuel.

The TCM system only uses fuel metering forces.

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11
Q

How do you adjust for unmetered fuel pressure low and high RPM?

A

Low unmetered fuel pressure - Adjust at the pump relief valve

High unmetered fuel pressure - Adjust at the variable oriface

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12
Q

Troubleshooting:

The fuel flow of a TCM system is reading higher than normal and the engine is running rough. What could be the problem?

A

A blockage in the fuel nozzle.

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13
Q

What will happen if the nozzle screen of a RSA system becomes clogged?

A

The fuel will become richer, the cylinder will become cooler, and there will be a change in the CHT guage.

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14
Q

Where does the nozzle dispense it’s fuel?

A

Intake valve

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15
Q

What are the names of the two halves of a cylinder?

A

Barrel and head

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16
Q

Foe TCM systems, what is the “spider” also known as?

A

The fuel manifold

17
Q

Name two functions of the Fuel manifold.

A

Distributes fuel to the nozzles

Provides positive pressure for shut down

18
Q

Where does the fuel pressure guage get it’s reading from?

A

The fuel manifold (Spider)

19
Q

How would you know which of the cylinders held the CHT of EGT probe?

A

Check the Type certification data sheet

20
Q

What are the five primary components of the RSA system?

A

Venturi housing

fuel metering unit

fuel regulator

flow divider

fuel nozzles

21
Q

Fuel delivered to the nozzle in a Bendix system is a function of what?

A

Mass air flow

22
Q

What is the function of the air metering forces in a Bendix?

A

To open the ball valve

23
Q

When transitioning to off-idle, what keeps the engine from stumbling?

A

Constant effort spring

24
Q

How does the AMC work in the bendix system

A
  • Bellows expand as aircraft climbs
  • Expansion pushes needle valve off its seat to open bleed port air
  • reduction of air diaphram pressure partially closes ball valve, which leans mixture
25
Q

How is the idle mixture adjusted?

A

By lengthening or shortning the arm between the butterfly valve or throttle plate

26
Q

In engine turbo charged, the injector nozzle is shrouded to what?

A

Upperdeck pressure

27
Q

What is used to clean the nozzles?

A

Asitone or hops gun cleaning solvent

28
Q
A

Powerplant (Class) 2 (7 decks)

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