Brainscape's Knowledge GenomeTM

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


See full index

Module 15 Richard > 15.13 Starting and Ignition Systems > Flashcards

15.13 Starting and Ignition Systems Flashcards

1
Q

What are the 3 main engine controls?

A
  • engine start controls
  • forward thrust controls
  • reverse thrust controls
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

How does the thrust lever control the thrust of the engines?

A

It informs the fuel control unit how much thrust is required by the pilot

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

What controls are used to start the engines?

A

The master switches

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

What is the purpose of the resolver?

A

It converts the thrust lever position (angular deflection) into an electrical signal

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

How is the engine and fuel supply switched on to the engines?

A

Via the engine start levers

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

What type of valve is the low pressure fuel shut-off valve?

A

An electric motor driven valve

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

When the low pressure fuel shut-off valve is open, is the indication illuminated or not illuminated in the cockpit?

A

It is not illuminated. It is only illuminated if the valve is closed

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

How is the high pressure fuel shut-off valve controlled?

A

Via the engine start levers - a mechanical input

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

What are the thrust control systems called in a mechanical thrust control system?

A

The throttles

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

How do the throttles transmit the thrust lever position to the FCU?

A

Via rods, pulleys, drums and flexible push-pull cables

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

What position would the power lever be in for a crank lever operated throttle if the pilot moves them to idle?

A

The mid position

Forward = thrust, Rearward = reverse thrust

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

What type of throttle transmission can be used instead of crank levers?

A

Rack and pinion

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

How do the throttles remain in a selected position?

A

A friction brake which is strong enough for preventing inadvertent movement from vibrations, but small enough to easily move

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

How does the auto throttle system move the throttle levers?

A

An electric servo motor moves the levers and the mechanical transmissions

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

What are the micro switches for that are connected to the throttle position?

A

They are used for warnings depending on position

  • take off warnings
  • cabin pressurisation
  • thrust reverser activation
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What are the 3 tasks for thrust reverser controls?

A
  • to activate the thrust reverser
  • to increase engine power
  • to block the reverse thrust lever while the reverser moves to the deployed position
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

What is the purpose of the throttle interlock system?

A

It is the main difference between the forward thrust controls and the reverse thrust controls

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Where is the mechanical throttle interlock system installed?

A

In the engine pylon

19
Q

How are electrical thrust controls safer to use?

A

Two signals are sent from each thrust lever to the associated control units (Channel A/B)

20
Q

How many resolvers are used for each thrust lever?

A

2

21
Q

What is the difference between the levers of mechanical aircraft and fly-by-wire aircraft?

A 
Mechanical = have a servo-mechanism which moves the throttles (autothrottle)
Fly-by-wire = thrust levers don’t move; they use an autothrust system via the autoflight system sending the values direct to the F.A.D.E.C
22
Q

What are the 3 main reverse thrust lever positions?

A
  • normal position (stows the reversers)
  • reverse idle (deploys the reversers)
  • full reverse (increases engine power)
23
Q

What is “start ignition”?

A

It is the continuous ignition for starting the engines only. After ignition, the igniters aren’t used unless required.

24
Q

What is “continuous ignition”?

A

It is selected manually or can be automatic if there is a risk of engine flame-out

25
Q

How many ignition systems does each engine have?

A

2 - each with their own power supply and components

26
Q

During continuous ignition, how many igniter systems are activated?

A

Usually both igniter systems

27
Q

When carrying out maintenance on the igniters, what must be ensured?

A

Not to touch the output of the igniters (exciters) including the igniter lead contacts due to the dangerous voltage they produce.

28
Q

When installing an igniter, what must be ensured?

A

That the correct immersion depth “F” is present

The difference between the values E and D. If spacers are installed, this increases distance D

29
Q

When should the number of spacers for an igniter be changed?

A

Only when changing the bushings of the igniter plug also.

30
Q

What can be seen on an igniter with toxic insulation?

A

Two blue rings

31
Q

What is the toxic insulation on an igniter made from?

A

Beryllium oxide

32
Q

Why should you take care with modern igniter plugs?

A

Modern igniter plugs are made from ceramic materials which are inflexible and can break easily if dropped

33
Q

If the electrical connections of the igniters are not in a good condition, what can this affect?

A

The spark output (decreases the energy produced)

34
Q

How are the igniter leads cooled?

A

Air is taken from the compressor and passed through the gap between the conduit and the insulation.

35
Q

What is the problem if the igniter lead isn’t cooled?

A

The resistance of the copper wire increases which decreases the output current of the igniter spark

36
Q

What type of systems can be used to start an engine?

A

Pneumatic or Electric starters

37
Q

What is the main purpose of the starter system?

A

To generate the necessary conditions in order to start the combustion process in the combustion chamber

38
Q

What is another use of the starter system?

A

During maintenance, it can be used to crank the engine

The crank feature is also used to assist a restart of the engine in flight

39
Q

How does the starter motor operate the engine compressor?

A

It turns the accessory gearbox which in turn, rotates the compressor

40
Q

What is important about the idle speed and the starter cut-out speeds of the engine?

A

They are always higher than the self-sustaining speed

41
Q

How does the pneumatic starter system get its air?

A

From the APU bleed air or ground cart (cross bleed from engine if one already running)

42
Q

How is the air supply to the starter turned on and off?

A

The starter shut-off valve which can also be manually operated

43
Q

How is the starter shut-off valve operated usually?

A

Electrically controlled by a solenoid and pneumatically controlled by the air pressure from the starter duct

Module 15 Richard (18 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions