Powerplant

Question 1

What indication would you see if you have a hot/lop situation and what automatic protections exist?

Answer 1

1 IDG 1/2 caution message

2. HOT = IDG auto disconnects
3. LOP = shear pin shears

Question 2

What’s the primary bleed source on the ground

Answer 2

APU - turns off in climb detention

Question 3

Where would you enter an assumed temperature for use with FLEX thrust?

Answer 3

PERF MENU

Question 4

When does the HPV open?

Answer 4

When 6th stage doesn’t supply enough pressure

Question 5

What comprises the N1 and N2 sections?

Answer 5

1. N1 = high pressure bypass fan, low pressure turbine

2. N2 = compressor, high pressure turbine

Question 6

Whats the purpose of the sprague clutch on the accessory gear box?

Answer 6

1. Allows the starting of the engine when it’s free spinning

2. FADEC will stop at 45%

Question 7

How are thrust reverser actuated?

Answer 7

Electrically controlled, hydraulically actuated

Question 8

What are normal/abnormal thrust modes

Answer 8

1. TOGA/APR
2. Climb/MCT thrust
3. CRZ/Proportional
   During single engine ops

Question 9

Which ignition system will FADEC use to start an engine on battery power alone?

Answer 9

B

Question 10

What would happen if you pressed HIGH PWR SCHEDULE

Answer 10

1. Engine thrust changes
2. Green switch light illumination
3. ENG HI PWR SCHED advisory

Question 11

When is APR armed?

Answer 11

When BOTH thrust levers are within 8% of TOGA

Question 12

Does an engine start effect ISOL valve?

Answer 12

Yes it opens it

Question 13

What’s max ITT during start

Answer 13

810*

Question 14

What percentage of eng air is bypass and what percentage is core air?

Answer 14

1. 85% bypass

2. 15% core

Question 15

What is different about the first 4 stages of the N2 compressor?

Answer 15

Variable geometry

Question 16

Describe variable geometry system

Answer 16

It prevents compressor stall and surge y adjusting the stator vanes in the N2 compressor section in the first 4 stages which are activated using high pressure fuel controlled by the FADEC

Question 17

What is the function of the operability valve?

Answer 17

Offloads 10th stage compressor bleed air during high loads to prevent surge and stall

Question 18

What actuates the operability valve?

Answer 18

FADEC by high pressure fuel

Question 19

What is attached to the accessory gear box?

Answer 19

3 - oil, fuel, hydraulics
2 - IDG, FADEC alternator
1 - ATS

Question 20

What compressor stages do we get bleed air?

Answer 20

1. 6th stage normally

2. 10th stage under high loads

Question 21

What purpose do we pull off bleed air?

Answer 21

1. Starting
2. Pressurization
3. Anti-ice

Question 22

How many injectors and how many igniters

Answer 22

18 objectors and 2 igniters ( A and B )

Question 23

How are the thrust levers connected to the Fuel Metering Unit?

Answer 23

Electrically

Question 24

When will the FADEC deactivate the APR

Answer 24

After landing

Question 25

Describe the auto-relight function

Answer 25

The FADEC will try 3 times and then the engine will flameout. It does so by energizing both the A and B igniters

Question 26

How much thrust in the max power detent.

Answer 26

14,510 lbs.

Question 27

How are the A and B igniters powered?

Answer 27

A - through the AC essential bus

B - through the battery bus

Question 28

How close must the N1s be in order to achieve syncing

Answer 28

1 1/2 percent

Question 29

What protection prevents engine over speed

Answer 29

The FADEC at 107% N2