Engine

Question 1

What type of engines does the emb-145 have?

Answer 1

Rolls-Royce AE3007A1
High bypass ratio (5-1)
Two spool
Axial flow
Turbo fan engine

Question 2

What are the components of the engine?

Answer 2

24 blade fan
14 stage compressor 5 variable pitc
2 stage high pressure turbine, compressor
3 stage low pressure turbine, fan
Accessory gear box
Forced air mixer

Question 3

How many FADEC’s are there and where are they located?

Answer 3

2 per engine A and B

Located in the forward electronics compartment.

Question 4

What is in the compressor section of the engine?

Answer 4

A 14 stage axial flow compressor

Question 5

What parts of the compressor are moveable?

Answer 5

The inlet guide vane and the first five stages of the compressor. (Compressor Variable Geometry)

Question 6

What is the fan connected to and how?

Answer 6

The 3 stage low pressure turbine

By an inside shaft.

Question 7

How is the compressor driven?

Answer 7

By the 2 stage high pressure spool

Question 8

How is the accessory gear box driven?

Answer 8

By a tower shaft driven by the 2 stage high pressure spool.

Question 9

What does ground idle ensure for the airplane?

Answer 9

Avoid flame out, overheat, and inability to accelerate
Adequate bleed flow and temperature for ECS
Adequate generator speed

Question 10

What does flight idle ensure?

Answer 10

Ground idle +
Anti icing
Go around in 8 seconds

Question 11

Where is bleed air taken from? Why?

Answer 11

9th low pressure
10th internal cooling
14th high pressure

Question 12

When does the 14th stage open?

Answer 12

Low thrust
Engine starts
Anti ice

Question 13

What is in the accessory gear box?

Answer 13

Fuel pump metering unit
2 generators
Hydraulic pump
Oil pump
Air turbine starter
Permanent magnetic starter

Question 14

How many fuel nozzles and igniter plugs are there?

Answer 14

16 fuel

2 igniters

Question 15

What are the fuel system components?

Answer 15

Fuel pump metering unit
(Engine and centrifugal pump)
Fuel cooled oil cooler
Compressor variable geometry
Fuel flow meter
Fuel nozzles

Question 16

What is the primary and secondary functions of the fuel system?

Answer 16

Filter and meter fuel for combustion

CVG
FCOC

Question 17

What does the oil system consist of?

Answer 17

12qt tank
Pressure pump 
Oil filter
ACOC
FCOC
sump and bearings

Question 18

What does the air oil separator do?

Answer 18

Removed foam generated by air seals and vents it out the top of the tank.

Question 19

When does oil bypass the FCOC?

Answer 19

When fuel temp is over 93.3 C

Differential pressure is over 50psi

Question 20

What are the components of the ignition system?

Answer 20

2 igniters powered by PMA 10%

FADEC commands ignition at 14%

Question 21

What power the FADEC’s?

Answer 21

Essential DC 1 and 2

Until 50% N2 then PMA

Question 22

Which FADEC controls which igniter?

Answer 22

FADEC A controls igniter A

FADEC B controls igniter B

Question 23

How is the Starter Control Valve operated?

Answer 23

Electrically by the starter.

Question 24

What are the sources of air for an engine start?

Answer 24

Cross bleed
APU
Ground air

Question 25

What is the engine start sequence?

Answer 25

``` 0% FADEC powered, signals igniter 10% PMA Powers igniter 14% FADEC commands ignition 28% FADEC commands fuel 50% FADEC powered by PMA 53% ATS valve closes 56.4% starter cuts out 56.7% FADEC successful start ```

Question 26

How do the thrust reverser doors open?

Answer 26

Hydraulic actuator pivoting the doors open.

Question 27

How many locks are on the thrust reverser?

Answer 27

3 Primary - holds load Secondary - unloaded Tertiary - unloaded

Question 28

How are the primary and secondary lock controlled and actuated?

Answer 28

Electrically controlled | Hydraulically actuated

Question 29

How is the tertiary lock controlled?

Answer 29

Electrically controlled | Electrically actuated

Question 30

When will the thrust reversers deploy?

Answer 30

Main gear WOW +25kts | Main and nose gear WOW

Question 31

How is control transferred from one FADEC to the other?

Answer 31

Automatically on each start or a fault is detected Manually by the selector knob

Question 32

When will the FADEC's command T/O 1 mode?

Answer 32

``` T/O 1 mode selected T/O 1 button pressed Thrust levers beyond detent Landing gear down below 15,000' Engine disagree Power interruption. ```

Question 33

When will the FADEC's allow CON mode?

Answer 33

Above 300' and gear up | Above 1700'

Question 34

When can CLIMB and CRUISE mode be selected?

Answer 34

Above 500' gear up | Above 1700'

Question 35

What triggers ATTCS?

Answer 35

TLA opposite engine below 38 Either FADEC receives inop signal Doesn't arm or disarm in 2 seconds

Question 36

What are the FADEC discrete outputs?

Answer 36

N2 speed each engine | Environmental control system off

Question 37

What happens when n1 is lost?

Answer 37

N1 is derived from the corresponding N2

Question 38

What powers the FADEC's potentiometers?

Answer 38

FADEC

Question 39

What are the different sections of the engine.

Answer 39

``` Fan Compressor Combustion Turbine Exhaust ```