Engines

Question 1

What engines are used on the e190?

Answer 1

CF34-10E5A1

Question 2

Describe the CF34-10E5A1 engine

Answer 2

High bypass, axial flow, dual rotor turbofan

Question 3

How are the engines controlled?

Answer 3

By a FADEC

Question 4

How many channels does the engine FADEC have?

Answer 4

2

Question 5

What are the two possible paths fuel can take?

Answer 5

• through the high pressure pump and back to the fuel tank
• through the FOHE, through the filter and into the FMU

Question 6

What does the engine starting system consist of?

Answer 6

• air turbine starter
• starter control valve

Question 7

How many igniters are there per engine?

Answer 7

2

Question 8

How many igniters are used when starting an engine?

Answer 8

On ground = 1
In flight = 2

Question 9

What does the OVRD position do on the ignition selector knob?

Answer 9

Ignites both igniters

Question 10

What are the 4 stages to an on ground engine start?

Answer 10

1) FADEC initiates ignition at 7% N2
2) fuel flow metering valve (FMV) opens between 20-25% N2
3) after light off, FADEC commands starter cut out at approx 50% N2
4) FADEC commands FMV to accelerate engine to ground idle speed

Question 11

During an on ground engine start what happens if there is no light off within 15 seconds of fuel on?

Answer 11

FADEC turns ignition off and dry motors for 30 seconds

Question 12

What is the only difference between a cross bleed start and an on ground start?

Answer 12

FMV opens if N2 has not reached 15% after 15 seconds

Question 13

What is the only difference between an on ground start and a windmill start?

Answer 13

FMV opens at min 7.2% N2 or 15 seconds (whichever comes first)

Question 14

During a windmilling start when should the start be manually aborted?

Answer 14

If no light off within 15 seconds of fuel on

Question 15

What does the FADEC not protect for during starts in flight?

Answer 15

Hot, hung or no light off starts

Question 16

What icon is shown on the EICAS during an auto relight?

Answer 16

WML

Question 17

When should an auto relight be manually aborted?

Answer 17

If no light off within 30 seconds or N2 falls below 7.2%

Question 18

If one thrust reverser has failed what happens if both thrust levers are selected to max reverse?

Answer 18

Only minimum reverse thrust is available

Question 19

If one thrust reverser has failed what happens if the operative thrust lever is selected to max reverse?

Answer 19

Max reverse is given on the operative engine

Question 20

What is the configuration of the FADEC channels?

Answer 20

2 channels in active/standby configuration. The active one is switched at every engine start

Question 21

How is the FADEC powered?

Answer 21

• PMA above 50% N2
• 28V DC below 50% N2

Question 22

When does ATTCS command reserve power?

Answer 22

• difference between n1 values is greater than 15%
• one engine failure during takeoff
• one engine failure during go around
• windshear detection

Question 23

How can ATTCS be manually activated?

Answer 23

By moving the thrust levers to max

Question 24

What is minimum flex takeoff thrust?

Answer 24

75% max rate takeoff thrust or CLB-2 +1% (whichever is highest)

Question 25

What are the 4 idle modes?

Answer 25

Flight
Approach
Final approach
Ground

Question 26

What is indicated by a cyan line on the n1 display?

Answer 26

Minimum n1 needed for anti ice

Question 27

What does the FADEC give protection against during ground starts?

Answer 27

Hung, hot and no light off starts

Question 28

When does the FADEC command engine shutdown?

Answer 28

If n2 reaches 102%

Question 29

What is max ITT for fuel flow on ground?

Answer 29

120 Celsius