Brainscape's Knowledge GenomeTM

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


See full index

Call of the Heavies > Engines CBT's > Flashcards

Engines CBT's Flashcards

1
Q

On the 400, there are 2 types of engines. The CF6-80C2-B1F or the B5F. What is the difference?

A

The B1F is derated from the B5F and has a lower takeoff thrust rating.

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

Generally, what type of jet engine does the 747 have?

A

Dual rotor, axial flow, turbofan of high compression and bypass ratio.

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

How many ignitors does each engine have?

A

2

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

What is the “FADEC” called?

A

EEC (Electronic Engine Control)

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

What would a magenta oil quantity number mean?

A

It means it is the lowest oil quantity of all 4 engines

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

The secondary engine indications display when:

A
  1. Selected using the Secondary Engine Display switch (the ENG switch on the display select panel).
  2. The display initially receives electrical power.
  3. A fuel control switch is moved to CUTOFF in flight.
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

On any engine parameter indication (N1, N2, EGT, etc), the normal operating range is what color?

A

White

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

With autostart on, what does pulling an engine start switch do?

A

-Arms start valve

-Opens engine bleed air valve

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

After you pull an engine start switch, when does the switch release and fall back to its normal position?

A

At 50% N2

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

At 50% N2, the start switch releases. What happens when this occurs?

A

-Start valve closes
-Engine bleed valve closes

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

What is the difference between pulling the engine start switch when autostart is on or off?

A

ON: - ARMS start valve
- Opens engine bleed air valve

OFF: -OPENS start valve
-opens engine bleed air valve

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

You see an engine start switch illuminate white. What is this telling you?

A

That the start valve is open

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

What does selecting the CON switch on do on the engine start and ignition overhead panel?

A

-selected ignitors operate continuously

-commands approach idle MINIMUM

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

On the engine start and ignition overhead panel, what does the “SINGLE” and “BOTH” knob do?

A

SINGLE: EEC alternates between igniter 1 and 2 after each ground start (both for inflight flameout)

BOTH: selects all igniters

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

When do selected ignitors activate?

A

-During start (below 50% N2)
-Any flap deployment
-Nacelle anti-ice ON
-Engine flameout

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

On the engine start and ignition overhead panel, what does the STBY knob titled “1, NORM, 2” do?

A

It determines where the electricity will come from to power the selected igniters.

NORM: AC powers selected igniters (standby power system kicks in if no AC)

1 or 2: Standby power will be used to supply either igniter 1 or 2.

17
Q

Two conditions will automatically activate ignition for all engines simultaneously.
These conditions are:

A

• the trailing edge flaps are out of the up position, or
• the Continuous Ignition switch is ON.

18
Q

Certain conditions require the Continuous Ignition to be on. They are:

A

• Heavy rain
• Severe turbulence
• Volcanic ash
• Icing conditions
• Standing water or slush on runway.

Note: Continuous ignition is automatically provided when nacelle anti-ice is ON.

19
Q

What happens when you move an engine fuel control switch into the RUN position?

A

Autostart ON:
-Opens spar fuel valve
-Opens engine fuel valve
-EEC sequences start valve, fuel metering valve, and igniter operation

Autostart OFF:
-Opens spar fuel valve
-Opens engine fuel valve
-Energizes igniters

20
Q

What happens when you position a fuel control switch to CUTOFF?

A

-Closes fuel valves
-Removes igniter power
-Commands hydraulic demand pump to operate (when in auto)
-Unlocks engine fire switch

21
Q

When the engines are OFF, you will see a magenta line on the N2 tape. What does this mean?

A

This is a “fuel on” indicator line. This displays the minimum N2 at which the fuel control switch could be moved to RUN during a manual start. It is simply for guidance to the pilots.

22
Q

During start, you notice an extra red line on the EGT tape that normally isn’t there when the engine is running. What is that?

A

It is the EGT start limit line. It simply tells you the EGT limit for the engine during start, and will disappear after start when the engine is stabilized.

23
Q

The auto start system will monitor the engine start and automatically about for certain conditions. What are these conditions?

A

• Hot start
• Hung start
• No EGT rise

Note: The autostart system does not monitor oil pressure or N1 rotation.

24
Q

If the engine does not light off during the first autostart attempt, what will it do?

A

It will purge the fuel and make another start attempt.

It will motor for 30 seconds and will try again with both ignitors.

It will try 3 start attempts before quitting, at which point it will motor for 30 seconds and close the fuel, ignition, and bleed air and give you an EICAS message “ENG 1,2,3,4 AUTOSTART”

25
Q

After an engine failure in flight, you follow the checklist and move the fuel cutoff switch to CUTOFF. You see a magenta “X-BLD” next to the N2 indicator of the failed engine. What does “X-BLD” mean?

A

X-BLD indicates crossbleed air is recommended for in-flight start and airspeed is lower than required for a windmilling start.

26
Q

How does an in-flight engine start differ from an on the ground engine start?

A

An in-flight Autostart is initiated by moving the FUEL CONTROL switch to RUN with the AUTOSTART switch in the ON position. The START switch is not normally pulled for an in-flight start unless an EICAS display of X-BLD is displayed.

27
Q

Does the EEC abort auto starts in flight?

A

No. The in-flight auto-start sequence is not automatically aborted and is not limited to a number of attempts. In-flight, the EEC continues making start attempts until the engine stabilizes at idle or until the Fuel Control switch is moved to CUTOFF by the pilot.

NOTE: If hot or hung start detected in flight, the EEC cuts off then reapplies fuel and allows the EGT to go past the start limit, all the way to the takeoff limit before fuel is cutoff.

Summary: It wont ever stop attempting to start, however it may temporarily stop the process and try again (Hot or hung start)

28
Q

Describe EEC flameout protection.

A

If the EEC detects a flameout (rapid decrease of N2 or N2 below idle), it will activate both igniters automatically.

29
Q

What happens if an engine thrust lever is forward of the idle position during an in-flight start or auto-relight?

A

The EEC will first stabilize the engine at idle before advancing thrust to thrust lever position.

30
Q

How many EEC’s per engine?

A

1

31
Q

The engine can continue to run without the EEC functioning. (True or false)

A

False

The EEC must be working for the engine to work.

32
Q

How is the EEC powered?

A

By an alternator mounted on the accessory gearbox

33
Q

Each EEC has 2 modes. What are they? What do they do?

A

NORMAL: EEC sets N1 based on thrust lever position

ALTERNATE: EEC sets N1 based on thrust lever position, but does not offer maximum N1 protection. Therefore, full to the stop throttle could exceed maximum N1. (Unlike in NORMAL mode, full to the stop throttle is simply maximum N1). Alternate mode also requires you to change the thrust based on environmental conditions, bleed requirements, etc. (NORMAL mode allows you to leave the thrust in a fixed position and it maintains that amount of thrust regardless of bleed demands.)

NOTE: EEC switches from NORMAL to ALETERNATE automatically, if a fault is detected.

34
Q

If an EEC switches to ALTERNATE mode, the autothrottles disconnect. Can you use autothrottles?

A

Yes, but first all 4 engines must be in ALTERNATE mode before you can re-engage the autothrottles

35
Q

What is the difference between minimum idle and approach idle?

A

Approach idle is a higher thrust setting than minimum idle. Approach idle is used when faster engine response is desired, such as for a go-around.

36
Q

The EEC will select approach idle in flight when:

A

• Nacelle anti-ice is ON
• Flaps are in landing position
• Continuous ignition switch is ON

37
Q

The EEC maintains approach idle until________ after touchdown, and then selects minimum idle.

A

five seconds

38
Q

The EEC provides overspeed protection for the N1 and N2 in normal and alternate modes. (True or False)

A

True

39
Q

What are the 4 sources of possible engine vibration?

A

-FAN
-LPT (Low pressure turbine)
-N2
-BB (broad band. Means source cannot be determined, average entire engine vibration)

Call of the Heavies (39 decks)

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