Engine

Question 1

What type of engines are one the aircraft?

Answer 1

2 General Electric hi-bypass, 2-spool, axial-flow, turbofans

Question 2

Describe N1 spool

Answer 2

• Single stage fan

- 4 stage LP turbine

Question 3

Describe the N2 spool

Answer 3

• 10 stage compressor (gas generator)

- 2 stage HP turbine

Question 4

How many igniters per engine?

Answer 4

2 per engine

Question 5

How many igniters activate for engine start?

Answer 5

• Ground: 1 igniter (switch in AUTO)

- Flight: 2 igniters (switch in AUTO)

Question 6

What happens when the ignition switch is selected to OVRD?

Answer 6

Activates both igniters on the ground or in flight

Question 7

Can the igniters be turned off during flight?

Answer 7

• The switch may be moved to the OFF position but the FADEC disregards the command
• The OFF position is used for dry motoring on the ground only

Question 8

What controls the engines?

Answer 8

• A two-channel FADEC

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

Question 9

Is only one FADEC channel used ever flight?

Answer 9

No, they automatically alternate with each engine start

Question 10

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

Answer 10

• The minimum N1 for bleed requirements in icing conditions

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

Question 11

What sources are available for engine starting?

Answer 11

• APU
• Ground source (suffer cart or air bottle)
• Opposite engine
• Windmill start

Question 12

Does the FADEC provide engine start protection?

Answer 12

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

Question 13

What will the FADEC automatically do in case of a hot start?

Answer 13

• FADEC will not allow FF if ITT > 120C

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

Question 14

Describe the engine start sequence

Answer 14

Start switch to START:

• 7% N2: Ignition
• 20% N2: Fuel flow
• 20% N2 + 5 secs: Light-off
• 50% N2: Ignition off

Question 15

Describe engine indications after it stabilizes following engine start

Answer 15

• N1: 27%
• ITT: 460C
• N2: 62%
• FF: 550 Lbs/hr
• Oil pressure: > 25psi

Question 16

What does WML mean on the engine indications?

Answer 16

• Windmilling engine
• The FADEC gas detected a flameout and is attempting an auto relight, or
• An assisted start has been commanded

Question 17

What provides under- and over-speed protection?

Answer 17

• The FADEC via the FMU

- Approximately 52% N2 and 102% N2 respectively

Question 18

What heads the fuel and cools the engine oil?

Answer 18

Fuel-oil heat exchanger

Question 19

What is ATTCS? What controls it?

Answer 19

• Automatic takeoff thrust control system
• Provides max thrust reserve (RSV) according to current rate previously selected via the MCDU
• FADEC controlled

Question 20

What will trigger an ATTCS event?

Answer 20

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

Question 21

When is thrust reverse available?

Answer 21

Weight on wheels

Question 22

What happens if a thrust reverser inadvertently deploys

Answer 22

FADEC limits respective engine thrust to IDLE

Question 23

What engine thrust ratings may only be used for 5 minutes?

Answer 23

• TO1
• TO-RSV (TL beyond TOGA)
• GA (two-engine go-around)
• GA-RSV (one-engine go around or wind shear)

Question 24

What is FLEX?

Answer 24

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

Question 25

Can the FLEX thrust be reduced lower than CLB thrust?

Answer 25

No