Engine

Question 1

What types of engines are on the aircraft?

Answer 1

2 General Electric CF-34-8E5

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

Question 2

How much thrust do the engines produce?

Answer 2

13,800-14,200lbs (ISA)

Question 3

Describe N1 spool

Answer 3

• Single stage fan

- 4 stage LP turbine

Question 4

Describe N2 spool

Answer 4

• 10-stage compressor (gas generator)

- 2-stage HP turbine

Question 5

How many igniters per engine?

Answer 5

2 per engine

Question 6

How many igniters activate for engine start?

Answer 6

Ground - 1 igniter (switch in Auto)

Flight - 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 or 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 and the other remains in standby as a backup

Question 10

Is only one FADEC channel used every flight?

Answer 10

NO. They automatically alternate with each engine start

Question 11

What does the Cyan line on the N1 gauge represent during the approach? When does it appear?

Answer 11

• The minimum N1 for bleed requirements in icing conditions

- Configured for landing

Question 12

What sources are available for engine starting?

Answer 12

• APU
• Ground Source (Huffer cart or Air bottle)
• Opposite engine
• Windmill start

Question 13

Does the FADEC provide engine start protection?

Answer 13

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

Question 14

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

Answer 14

• FADEC will not allow FF if ITT > 120°C

- FADEC will automatically dry motor engine and introduce fuel when ITT

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 has been commanded

Question 16

What provides under-speed and over-speed 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 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 via the MCDU
• FADEC controlled

Question 20

What will trigger an 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 (WOW)

Question 22

What happens if a 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 5 minutes?

Answer 23

• TO 1
• TO 2
• TO-RSV (TL beyond TOGA)
• GA (2 engine go around)
• GA-RSV (one engine GA or windshear)

Question 24

What is FLEX?

Answer 24

Reduced T/O 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 than CLB thrust?

Answer 25

NO