CF34-8E5

Question 1

N1 spool

Answer 1

Single stage fan

4 stage LP turbine

Question 2

Describe N2 spool

Answer 2

10 stage compressor ( gas generator)

2 stage HP turbine

Question 3

Igniters

Answer 3

2 per engine

Question 4

Igniters activate for engine start

Answer 4

Ground 1igniter (sw in auto)

Flight 2 igniters (sw in auto)

Question 5

What happens when ignition sw in override ?

Answer 5

OVRD

activates both igniters on ground or in Flight

Question 6

Can the igniters be turned off during flight?

Answer 6

The sw may be moved to the OFF position but the FADEC disregards the command

The OFF position is used for dry motoring on the ground

Question 7

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

Answer 7

The minimum N1 for bleed requirements in icing conditions

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

Question 8

What sources are available for engine starting?

Answer 8

APU

Ground source (huffer cart or air bottle)

Opposite engine

Windmill start

Question 9

Does the FADEC provide engine start protection?

Answer 9

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

Question 10

What will the FADEC automatically do in case HOT start?

Answer 10

FADEC will not allow FF if ITT >120 deg C

FADEC will automatically dry motor engine and introduce fuel when ITT

Question 11

Describe the engine start sequence

Answer 11

Start switch momentarily to start: 
7% N2.   Ignition 
20% N 2       Fuel Flow( + 5 sec Light-off)
50% N2.       Ignition off
Engine stabilizes: 
N1.    27%.          ITT 460 degC    N2 62%
FF   550 lbs/hr 
Oil pressure >25 psi

Question 12

What does WML mean on the engine indications?

Answer 12

Windmilling engine

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

An assisted start has been commanded

Question 13

What provides under speed and overspeed protection?

Answer 13

The FADEC via the FMU

Approximately 52% N2 and 102% N2 respectively

Question 14

What heats the fuel and cools the engine oil?

Answer 14

Fuel/Oil heat exchanger

Question 15

What is ATTCS?

What controls it?

Answer 15

Automatic takeoff thrust control system

Provides max thrust reserve (RSV) according to current rate previously selected via the MCDU

FADEC controlled

Question 16

What will trigger an ATTCS event?

Answer 16

N1 difference > 15% between engines

Engine failure during TOGA

Windshear detected

Question 17

When is thrust reverse available?

Answer 17

Weight on wheels (ground use only)

Question 18

What happens if reverser inadvertently deploys?

Answer 18

FADEC limits respective engine thrust to IDLE

Question 19

What engine thrust rating(s) may only be used for 5 minutes?

Answer 19

TO-1

TO-RSV (TL beyond TOGA)

GA (two engine go-around)

GA-RSV (one-engine go-around or Windshear)

Question 20

What is FLEX?

Answer 20

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

Question 21

Can the FLEX thrust be reduced lower than CLB thrust?

Answer 21

No

Question 22

Type engine

Answer 22

2 GE hi-bypass, 2 spool, axial-flow, turbo-fan