Study Guide Engines

Question 1

How much thrust?

Answer 1

13,800to 14,200

Question 2

Describe n1 spool

Answer 2

Single stage fan… Four stage low pressure turbine

Question 3

Describe the N2 spool

Answer 3

Ten stage compressor……Gas generator.

Two stage high pressure turbine

Question 4

How many igniters per engine?

Answer 4

Two

Question 5

How many igniters activate for engine start?

Answer 5

One on ground and two for in flight.

Question 6

What happens when engine switch is set to override?

Answer 6

Both igniters commanded on either in flight or on ground.

Question 7

Can the igniters be turned off during flight?

Answer 7

The switch may be turned to the OFF position during flight but the FADEC disregards the command.
The OFF position is used for dry motoring on the ground.

Question 8

What controls the engine?

Answer 8

A two channel FADEC.

Question 9

What does the cyan line on the N1 gauge represent during an approach and when does it appear?

Answer 9

The min N1 for anti icing conditions. It comes on when configured for landing when below 1200 radar altimeter, configured for landing and when anti ice is on.

Question 10

What sources of air are avail for engine start?

Answer 10

APU
Cross bleed air
Ground cart
Windmilling

Question 11

Does FADEC provide engine start protection?

Answer 11

Only on the ground for hot and hung starts or no light off.

Question 12

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

Answer 12

Will not allow fuel flow with ITT above 120 C

FADEC will auto dry motor the engine and introduce fuel at ITT less than 120.

Question 13

Describe the engine start sequence.

Answer 13

Switch monetarily to start.
At 7% N2 ignition
At 20% N2 fuel flow..... Provided temp is below 120
At 20% N2 plus five seconds, light off
At 50% N2, starter ignition off.

Question 14

Engine stabilizes at about what settings?

Answer 14

N1.....27
ITT 460
N2... 62
Fuel flow..... 550 pounds per hour
Oil pressure.... 25 psi

Question 15

Thrust ratings

Answer 15

Take off 1, take off 1 reserve, go around and go around reserve is ten minutes.
CON is continuous max thrust… CLB (Max climb thrust) CRZ is max cruise…. Idle

Question 16

What does WML mean on engine indications?

Answer 16

Windmilling engine

FADEC is attempting a relight of a flamed out engine or an assisted start has been commanded.

Question 17

What provides under and over speed protection?

Answer 17

The FADEC via the FMU…. fuel metering unit.

This happens at about 52 N2 and 102 N2

Question 18

What happens after three over speed detection events?

Answer 18

FADEC will not relight the engine.

Question 19

What heats the fuel and cools the oil?

Answer 19

The fuel..oil heat exchanger.

Question 20

What is ATTCS and what controls it?

Answer 20

Automatic take off thrust control system.

It provides max thrust reserve according to the current rate previously selected via the MCDU and is FADEC controlled.

Question 21

What will trigger an ATTCS?

Answer 21

N1 difference of 15% between the two engines.
Engine failure during toga
Wind shear detected.

Question 22

Hen is thrust reverse available?

Answer 22

Weight on wheels

Question 23

What happens if a thrust reverse inadvertently deploys?

Answer 23

FADEC limits respective engine thrust to idle.

Question 24

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

Answer 24

TO-1
TO- RSV. (Levers beyond toga)
GA RSV …. One engine inop or wind shear.

Question 25

What is flex?

Answer 25

Reduced take off power using an assumed temp.. Telling the Fms that is is hotter than it actually is.

Question 26

Can flex be reduced lower than climb thrust?

Answer 26

No

Question 27

What type of engines?

Answer 27

General Electric CF-34-8E5…. Hi-bypass two spool axial flow turbo fan.