CF34-8E5 Flashcards Preview

E Jet 175 Study Guide > CF34-8E5 > Flashcards

Flashcards in CF34-8E5 Deck (22):
1

N1 spool

Single stage fan

4 stage LP turbine

2

Describe N2 spool

10 stage compressor ( gas generator)

2 stage HP turbine

3

Igniters

2 per engine

4

Igniters activate for engine start

Ground 1igniter (sw in auto)

Flight 2 igniters (sw in auto)

5

What happens when ignition sw in override ?

OVRD

activates both igniters on ground or in Flight

6

Can the igniters be turned off during flight?

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

7

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

The minimum N1 for bleed requirements in icing conditions

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

8

What sources are available for engine starting?

APU

Ground source (huffer cart or air bottle)

Opposite engine

Windmill start



9

Does the FADEC provide engine start protection?

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

10

What will the FADEC automatically do in case HOT start?

FADEC will not allow FF if ITT >120 deg C

FADEC will automatically dry motor engine and introduce fuel when ITT

11

Describe the engine start sequence

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


12

What does WML mean on the engine indications?

Windmilling engine

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

An assisted start has been commanded

13

What provides under speed and overspeed protection?

The FADEC via the FMU

Approximately 52% N2 and 102% N2 respectively

14

What heats the fuel and cools the engine oil?

Fuel/Oil heat exchanger

15

What is ATTCS?
What controls it?

Automatic takeoff thrust control system

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

FADEC controlled

16

What will trigger an ATTCS event?

N1 difference > 15% between engines

Engine failure during TOGA

Windshear detected

17

When is thrust reverse available?

Weight on wheels (ground use only)

18

What happens if reverser inadvertently deploys?

FADEC limits respective engine thrust to IDLE

19

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

TO-1

TO-RSV (TL beyond TOGA)

GA (two engine go-around)

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

20

What is FLEX?

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

21

Can the FLEX thrust be reduced lower than CLB thrust?

No

22

Type engine

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