Oral: Engine Questions Flashcards

Know

1
Q

What types of engines are on the aircraft?

A
  • Two General Electric CF-34-8E5

* Hi-bypass, 2-spool, axial-flow, turbo-fan

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

How much thrust do the CF-34-8E5 engines produce?

A

13,000-14,200 lbs. (ISA)

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

Describe N1 spool

A
  • Single-stage fan

* 4-stage LP turbine

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

Describe N2 spool

A
  • 10-stage compressor (gas generator)

* 2-stage HP turbine

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

How many igniters per engine?

A

2 per engine

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

How many igniters activate for engine start?

A
  • Ground = 1 igniter ( switch in AUTO )

* Flight = 2 igniters ( switch in AUTO )

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

What happens when the ignition switch is selected to OVRD?

A

•Activates both igniters on the ground or in flight

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

Can the igniters be turned off during flight?

A
  • The switch may be moved to the OFF position but the FADEC disregards the command
  • The OFF position is used for dry motoringon the ground only
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What controls the engine?

A
  • A two-channel FADEC

* One channel is active and the other channel remains in standby as a backup

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

Is only one FADEC channel used every flight?

A

No. They automatically alternate with each engine start

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

What does the cyan line on the N1 gauge represent during approach?

When does it appear?

A
  • The minimum N1 for bleed requirements in icing conditions

* Configured for landing < 1200’ RA (when anti-ice is ‘ON’)

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

What sources are available for engine starting?

A
  • APU
  • Ground source (huffer cart or air bottle)
  • Opposite engine(crossbleed start)
  • Windmill start
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Does the FADEC provide engine start protection?

A

Only on the ground for a hot start, hung start or no light-off

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

What will the FADEC automatically do in case of a HOT start on the ground?

A
  • FADEC will not allow FF if ITT >120°C

* FADEC will automatically dry motor engine and introduce fuel when ITT <120°C

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

Describe the engine start sequence:

Start…

Stabilizing…

A

•Start switch momentarily to START:

  1. 7% N2 Ignition
  2. 20% N2 Fuel flow
  3. 20% N2+ 5 sec Light-off
  4. 50% N2 Ignition off
  5. 50% N2Starter cutout

Engine stabilizes:

  1. N1 [27%]
  2. ITT [460°C]
  3. N2 [62%]
  4. FF [550 lbs/hr]
  5. Oil Pressure [>25 psi]
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What does WML mean on the engine indications?

A
  • Windmilling engine
  • The FADEC has detected a flame-out and is attempting an auto re-light, or
  • An assisted start has been commanded
17
Q

What provides underspeed and overspeed protection?

A
  • The FADEC via the FM

* Approximately 52% N2 and 102% N2 respectively

18
Q

What happens after 3 overspeed detection events?

A

FADEC will not re-light the engine

19
Q

What heats the fuel and cools the engine oil?

A

Fuel/Oil heat exchanger

20
Q

What is ATTCS? What controls it?

A
  • Automatic Take-off Thrust Control System
  • Provides max thrust reserve (RSV) according to current rate previously selected via the MCDU
  • FADEC controlled
21
Q

What will trigger an ATTCS event?

A
  • N1 difference >15% between engines
  • Engine failure during TOGA
  • Windshear detected
22
Q

When is thrust reverse available?

A

Weight-on-wheels (ground use only)

23
Q

What happens if a thrust reverser inadvertently deploys?

A

FADEC limits respective engine thrust to IDLE

24
Q

What engine thrust rating(s) may only be used for 10minutes?

A
  • TO-1
  • TO-1 RSV (TL beyond TOGA)
  • GA (two-engine go-around)
  • GA-RSV (one-engine go-around or windshear)
25
Q

What is FLEX?

A

Reduced takeoff thrust based on assumed temperature (telling the FADEC that it is warmer than it actually isso it will reduce the thrust)

26
Q

Can the FLEX thrust be reduced lower than CLB thrust?

A

No