Engine

Question 0

How much thrust do the engines produce?

Answer 0

13,000-14,200 lbs (ISA)

Question 1

What types of engines are on the aircraft?

Answer 1

Two General Electric CF-34-8E5

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

Question 2

Describe the 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

Two 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 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 engine?

Answer 8

2-channel FADEC

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

Question 9

Is only one FADEC channel used every flight?

Answer 9

Yes. 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 bleed requirements in icing conditions.

Configured for landing ).

Question 11

What sources are available for engine starting?

Answer 11

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

Question 12

What engine start protection does the FADEC provide?

Answer 12

Only on the ground for:
A Hot Start - insufficient airflow to keep ITT temperature within limit.
A Hung Start - compressor not accelerating to create required airflow.
No Light-off - air and fuel introduced but no ignition.

Question 13

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

Answer 13

FADEC Will not allow FF if ITT >120°C.

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

Question 14

Describe the engine start sequence.

Answer 14

Start switch momentarily to START:
7% N2						ignition
20% N2						fuel flow 
20% N2 +5 sec		light off
50% N2						ignition off

Engine stabilizes:
N1								27%
ITT 								460°C
N2								62%
FF								550 lbs/hr
Oil pressure				>25 psi

Question 15

What does WML mean on the engine indications?

Answer 15

Windmilling engine
The FADEC has detected a flame-out and is attempting an auto relight, or
An assisted start his been commanded

Question 16

What provides underspeed and overspeed 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

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 the the MCDU.

FADEC controlled.

Question 20

What will trigger and 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 (ground use only)

Question 22

What happens if thrust reverser inadvertently deploys?

Answer 22

FADEC limits respective engine thrust to IDLE

Question 23

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

Answer 23

TO-1
TO-RSV (thrust levers beyond TOGA)
GA (two engine go around)
GA-RSV (one engine go around or windshear)

Question 24

What is FLEX?

Answer 24

Reduced take off thrust based on assumed temperature

(telling the FADEC that it is warmer than it actually is so it will reduce the thrust)

Question 25

Can the FLEX thrust be reduced lower then CLB thrust?

Answer 25

No