Study Guide Engine

Question 1

What types of engines are on the aircraft?

Answer 1

-TWo GE CF-34-8E5 Hi-Bypass, 2 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, 4 stage LP turbine

Question 4

Describe N2 spool

Answer 4

10 stage compressor, 2 stage HP turbine

Question 5

How many ignators per engine?

Answer 5

2 per

Question 6

How many ignitors activate for engine start?

Answer 6

Ground

• 1 igniter (switch in AUTO)
• 2 igniters (switch in AUTO)

Question 7

What happens when the ignition switch is selected to OVRD?

Answer 7

Activates both igniters on the ground and in flight

Question 8

Can the igniters be turned off during flight?

Answer 8

• 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 9

What controls the engine?

Answer 9

• A two channel FADEC

- One channel is active while the other is standby. They alternate with each start

Question 10

What does the Cyan line on the N1 gauge represent on approach and when does it appear?

Answer 10

• Minimum N1 for bleed requirements in icing conditions

- Configured for landing <1200 RA (when anti ice is on)

Question 11

What sources are available for engine starting?

Answer 11

• APU
• Ground source (Air)
• Opposite engine
• Windmilling

Question 12

Does the FADEC provide engine start protection?

Answer 12

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

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 engine

Question 14

Describe the engine start sequence

Answer 14

Start switch to start

• 7% N2 ignition
• 20% N2 Fuel flow
• 20% N2 +5 seconds Light off
• 50% N2 ignition off

Engine stabilizes:

• N1 27%
• ITT 460 C
• N2 62%
• FF 550 lbs/hr
• Oil pressure >25psi

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 re-light, or
• An assisted start has 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 re-light the engine

Question 18

What heats the fuel and cools the engine oil?

Answer 18

Fuel/Oil heat exchange

Question 19

What is ATTCS? What controls it?

Answer 19

• Automatic Take-off Thrust Control System
• Provides max thrust reserve (RSV) according to current rate previously selected via the MCDU
• FADEC controlled

Question 20

What will trigger and ATTCS event?

Answer 20

• N1 difference >15% between engines
• Engine failure during TOGA
• Wind shear detected

Question 21

When is thrust reverse available?

Answer 21

Weight on wheels (ground use only)

Question 22

What happens if a thrust reverser inadvertently deploys?

Answer 22

FADEC limits respective engine thrust to IDLE.

Question 23

What engine ratings may only be used for 5 minutes?

Answer 23

• TO-1
• TO-RSV (TL beyond TOGA)
• GA (two-engine go around)
• GA-RSV (One engine go-around or windshear)

Question 24

What is FLEX?

Answer 24

Reduced takeoff thrust based on assumed temperature

Question 25

Can FLEX thrust be reduced lower than CLB thrust?

Answer 25

NO