Engine

Question 0

What controls engines

Answer 0

Dual channel FADEC system

Question 1

What type of engines

Answer 1

General Electric

Cf34- 8E5
High bypass dual rotor turbofan

Question 2

Describe how fuel gets to engines

Answer 2

From collector tanks to engine fuel pumps. Splits into 2 streams

High pressure pump back to tanks to supply motive flow

Low pressure pump to heat exchanger to fuel filter, back to high pressure pump then to FMU (fuel metering unit) then to fuel imjectors

Question 3

Oil system lubricates and cools what ?

Answer 3

Turbine engine main shaft bearings and accessory gear box

Question 4

Where is oil quantity info displayed

Answer 4

MFD

Question 5

What does the starter system include

Answer 5

ATS ( air turbine starter)

SCV ( starter control valve) controlled by FADEC

Question 6

Describe start sequence on ground

Answer 6

FADEC opens SCV to allow pneumatic system to provide air to the ATS. FADEC initiates ignition at 7% N2 and fuel flow starts at 20% n2 provided ITT is 120° c or less

After lightoff , starter cutout at 50%n2 and commands FMU TO accelerate to ground idle

Question 7

Ignition system

How many systems for start are energized

Ground?

Flight?

Answer 7

1 on ground

2 in flight

Question 8

What does ignition override do

Answer 8

Both igniters on each engine are energized

Will cause sig reduction in igniter life if used frequently

Question 9

Describe in flight cross bleed start

Answer 9

Identical to ground start except FMU opens to provide fuel after 15 seconds even if 20% n2 is not reached

Question 10

Describe windmilling start

Answer 10

Commanded by start stop switch
Ignition at 7 % n2
Fuel flow at 7.2% N2 or 15 seconds whichever occurs first

Question 11

Does FADEC provide protection for hot starts/ hung or failure to light off

Answer 11

On ground yes. If no lightoff in 15 seconds after fuel flow it switches ignitions

In flight- no

Question 12

When do you abort start

Answer 12

If no lightoff within 30 sec of fuel flow

Question 13

Describe auto relight

Answer 13

FADEC monitors n2 and turns on both igniters and schedules relight fuel flow in event if flameout

WML icon will show next to respective engine n2 on EICAS

Question 14

Inflight If engine does not relight automatically within 30 sec or n2 falls below 7.2% you should-

Answer 14

Consider it a failed attempt and you should terminate it manually by moving start stop switch to stop position

Question 15

Auto relight on ground is terminated and fuel flow is shutoff if

Answer 15

N2 falls below 52%.

Question 16

Thrust reversers are —- actuated

And controlled via

Answer 16

Hydraulically

Thrust lever

Question 17

What prevents inadvertent thrust reverser deployment and stowing

Answer 17

An interlock controlled by FADEC

Consisting of 2 actuator locks and an independent cowl lock

Question 18

What is the purpose of the cowl lock

Answer 18

Prevents inadvertent thrust reverser deployment

Question 19

Describe thrust reverser deployment

Answer 19

On ground move thrust levers to idle rev thrust

Once both cowls are deployed you can command Max rev thrust by holding thrust levers in Max rev

Question 20

What happens if one reverser fails while in Max rev?

Answer 20

Operating reverser will provide only min rev thrust unless you select just the operating thrust lever to Max rev

Question 21

If thrust reverser actuates in flight what happens

Answer 21

Engine thrust is limited to idle thrust

Question 22

Engine control system consists of

Answer 22

FADEC
Thrust levers
T2
N1 sensors

Question 23

What does thrust lever do

Answer 23

Receives input of desired thrust setting from pilot or auto throttles

Question 24

What does T2 do

Answer 24

Monitors engine inlet air temp for FADEC control calculations

Question 25

What does n1 sensor do

Answer 25

Provides fan speed info for FADEC and airplane vibration monitoring system

Question 26

Describe FADEC

Answer 26

Main component of engine system
It provides 
Engine protection
Control of requested and Max N1
Control of ATTCS

FADEC has 2 identical independent channels one is the in control
Channel the other is always in standby in case of active channel failure

The channels switch control on every start

Question 27

Where does FADEC get it’s electrical power

Answer 27

Below 50% n2 from the airplanes electrical system

Above 50% n2 from the PMA ( permanent magnet alternator)

Question 28

Describe the ATTCS

Answer 28

Automatic takeoff thrust control system,
Controlled by FADEC and is available on t/o and go around

It will provide RSV Power in event of engine failure

Displayed on EICAS as white - armed

And green - engaged. ( only when thrust levers are in TOGA

Question 29

When will RSV POWER BE ACTIVATED

Answer 29

ATTCS must be engaged
And if one of the following occurs

N1 difference greater than 15%
One engine fails during takeoff
One engine fails during go around
Windshear detected

Max thrust commanded by thrust levers

Question 30

What is minimum flex thrust for takeoff

Answer 30

75% of Max rated takeoff thrust or

Climb -2 + .5 %n1 whichever is higher

Question 31

What does

TO-x mean

Answer 31

Thrust used for normal takeoff

Question 32

What are the different idle modes

Answer 32

Flight idle
Approach idle
Final approach idle
Ground idle

Question 33

When is approach idle activated

Answer 33

Alt less than 15000’
In flight
Flaps 1 or greater
Gear down

Question 34

When is final approach idle active

Answer 34

Alt lower than 1200 agl
Landing flaps set
Gear down

Question 35

Describe n2 over speed protection

Answer 35

Whenever n2 reaches 102% FADEC commands an engine shutdown

In the event of 3 consecutive over speed indications within 30 sec FADEC will not relight the engine

Question 36

If FADEC aborts the start due to a high ITT what do you need to do

Answer 36

Close the SCV by putting the start stop switch to stop

Question 37

How much oil does each engine hold

Answer 37

10. 5 quarts

7. 2 usable

Question 38

How much oil does APU hold

Answer 38

4.54 quarts