Engine

Question 1

What types of engines are on the aircraft?

Answer 1

Two General Electric CF-34-8E5 Hi-bypass, 2-spool, axial-flow, turbo fan

Question 2

How much thrust do the CF-34-8E5 engines produce?

Answer 2

13,000-14,200 lbs. (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

Flight: 2 igniters (switch in AUTO)
Ground: 1 igniters (switch in AUTO)

The FADEC energizes one igniter for on-ground engine starts and both igniters for in-flight engine starts

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 in 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 channel remains in the standby as 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 approach?

When does it appear?

Answer 11

The minimum N1 for bleed requirements in icing conditions.

Configured for landing less than 1200 feet RA (when anti-ice is on)

Question 12

What sources are available for engine starting?

Answer 12

APU
Ground source (huffer cart or air bottle)
Opposite engine (Cross bleed start)
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.

The FADEC has NO protection for hot starts, hung starts or failure to light off for in flight starts.

Question 14

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

Answer 14

FADEC will not allow FF if ITT is greater than 120C.

FADEC will automatically dry motor engine and introduce fuel when ITT is less than 120C

Question 15

Describe the engine start sequence

Answer 15

Start switch momentarily to START:
7% N2: Ignition
20% N2: Fuel flow
20% N2 + 5 seconds: Light-off
50% N2: Ignition off
50% N2: Starter cutout

Engine stabilizes:
N1: 27%
ITT: 460C
N2: 62%
FF: 550lbs/hr
Oil pressure: Greater than 25 PSI

Question 16

What does WML mean on the engine indications?

Answer 16

Windmilling engine.

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

Question 17

What provides underspeed and overspeed protection?

Answer 17

The FADEC via the FMU.

Approximately 52% N2 (underspeed) and 102% N2 (overspeed)

Question 18

What happens after 3 overspeed detection events?

Answer 18

FADEC will not re-light the engine

Question 19

What heats the fuel and cools the engine oil?

Answer 19

Fuel/Oil heat exchanger

Question 20

What is ATTCS? What controls it?

Answer 20

Automatic Takeoff Thrust Control System.
Provides max thrust reserve (RSV) according to current rate previously selected via the MCDU.

FADEC controlled.

Question 21

What will trigger an ATTCS event?

Answer 21

N1 difference greater than 15% between engines.

Engine failure during TOGA.

Windshear detected.

Question 22

When is thrust reverse available?

Answer 22

Weight-on-wheels (ground use only)

Question 23

What happens if a thrust reverser inadvertently deploys?

Answer 23

FADEC limits respective engine thrust to IDLE

Question 24

What engine thrust rating(s) may only be used for 10 minutes?

Answer 24

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

Question 25

What is FLEX?

Answer 25

Reduced takeoff thrust based on actual Takeoff weight.

The assumed temperature is used to set FLEX.
(telling the FADEC that it is warmer than it actually is so it will reduce thrust)

Question 26

Can the FLEX thrust be reduced lower than CLB thrust?

Answer 26

No.

The minimum FLEX takeoff thrust is limited to 75% maximum rated takeoff thrust or CLB-2 + 0.5% N1, whichever is higher.