Engines

Question 1

What are the idle modes?

Answer 1

• Modulated
• Approach
• Reverse

Question 2

When will you get modulated idle?

Answer 2

• Regulated according to bleed system demand and ambient conditions
• In flight when the flaps are up and on the ground when no reverse is selected (taxi + cruise)

Question 3

When will you get approach idle?

Answer 3

• regulated according to aircraft attitude
• In flight with the flaps extended to allow for a more immediate selection for go around

Question 4

When will you get reverse idle?

Answer 4

• On the ground when the thrust levers are in REV IDLE, to give more thrust to slow down quicker

Question 5

Auto thrust range for two engines?

Answer 5

Idle to Climb

Question 6

Auto thrust range for one engine?

Answer 6

Idle to MCT

Question 7

What are the two FADEC channels?

Answer 7

One active and one standby - if one fails the other one automatically takes over

System has a magnetic alternator for the internal power source

Question 8

What are the FADEC protections?

Answer 8

• Hot start
• Hung start
• Failure to light up (wet start)
• Compressor Stall

Question 9

How many ignitors are used in a normal start?

Answer 9

One

Question 10

What does the FADEC use to calculate thrust?

Answer 10

N1 - fan speed

Question 11

Where are N1 and N2 shown?

Answer 11

On the EWD

Question 12

What does FADEC stand for?

Answer 12

Full Authority Digital Engine Control

Question 13

What temperature does the red line on the EGT gauge mean?

Answer 13

950 degrees

Question 14

How many FADECs?

Answer 14

Two - channel A and channel B

Question 15

How many starts will the FADEC attempt in a start sequence?

Answer 15

Four

Question 16

After each start attempt, how much is the fuel reduced by?

Answer 16

7%

Question 17

What are the functions of the HMU (Hydromechanical Unit)?

Answer 17

• controls fuel flow to the engine combustion chamber
• protects against overspeeding
• controls fuel hydraulic signals to actuators

Question 18

Do you need confirmation to shut down the engine master?

Answer 18

Yes

Question 19

Max time limit for MCT?

Answer 19

No time limit - max CONTINUOUS

Question 20

How does the fuel get to the engines?

Answer 20

Fuel flows from the tank, via the LP fuel pump and the fuel/oil heat exchanger to the HP pump to the HMU and to the fuel nozzles

Question 21

What will moving the ENG MASTER lever to OFF do?

Answer 21

Commands the closing of the LP and HP fuel shut off valves, closes the fuel return valve and opens the bypass valve

Question 22

How is the IDG cooled?

Answer 22

Some of the fuel flowing out of the HMU goes to cool the oil systems of the IDG

Fuel return valve (FRV) controlled by the FADEC ensures this flow is adequate

Question 23

How many igniters are used during an automatic start?

Answer 23

One - FADEC automatically alternates igniters used in successive start sequences

Question 24

How many igniters are used during a manual start?

Answer 24

Two

Question 25

When does ignition come on during an engine start?

Answer 25

Comes on when N2 reacges 16% and cuts of automatically when N2 reaches 50%

(in-flight starts immediately)

HP fuel valve opens when N2 is more than 22%