Engines

Question 1

What type of engines are on the aircraft?

Answer 1

GE CF-34-8E5

Hi-bypass, two spool, axial flow, turbo fan

Question 2

How much thrust do the engines produce?

Answer 2

13,800 - 14,200

Question 3

Describe N1 spool

Answer 3

Single stage fan

Four stage LP turbine

Question 4

Describe N2 spool

Answer 4

Ten stage compressor

Two stage HP turbine

Question 5

How many igniters per engine?

Answer 5

2 per engine

Question 6

How many igniters activate for engine start?

Answer 6

Ground: 1
Flight: 2

Question 7

What happens when ignition switch is set to OVRD?

Answer 7

Activates both igniters on ground or in flight

Question 8

Can the igniters be turned off during flight?

Answer 8

FADEC disregards off command

Question 9

What controls the engine?

Answer 9

A two-channel FADEC

Question 10

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

Answer 10

Min N1 for bleed requirements in icing

Configured for landing and

Question 11

What sources are available for engine starting?

Answer 11

APU
Ground source
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 FADEC automatically do in case of a hot start?

Answer 13

FADEC will not allow FF if ITT > 120 deg

FADEC will automatically dry motor engine and introduce fuel when ITT

Question 14

Describe the engine start sequence

Answer 14

7% N2: Ignition on
20% N2: Fuel flow
20% N2 + 5 sec: Light off
50% N2: Ignition off

Question 15

What does WML mean on engine indications?

Answer 15

Windmilling engine

The FADEC has detected a flame-out and is attempting an auto re-light, or assisted start has been commanded

Question 16

What provides overspeed and underspeed protection?

Answer 16

The FADEC via the FMU

Approximately 52% N2 and 102% N2 respectively

Question 17

What happens after 3 overspeed detection events?

Answer 17

FADEC will not relight the engine

Question 18

What heats the fuel and cools the engine oil?

Answer 18

The fuel/oil heat exchanger

Question 19

What is ATTCS? What controls it?

Answer 19

Automatic take-off thrust control system
Provides max thrust reserve according to current rate previously selected via the MCDU
FADEC controlled

Question 20

What will trigger an ATTCS event?

Answer 20

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

Question 21

When is thrust reverse available?

Answer 21

WoW (ground use only)

Question 22

What happens if a thrust reverser inadvertently deploys?

Answer 22

FADEC commands thrust to idle on affected engine

Question 23

What engine thrust ratings may only be used for 10 minutes?

Answer 23

TO, TO-RSV, GA, GA-RSV

Question 24

What is FLEX?

Answer 24

Reduced TO thrust based on assumed temperature

Question 25

Can FLEX thrust be reduced lower than CLB thrust?

Answer 25

No