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CRJ900 Limitations, Systems > Powerplant > Flashcards

Flashcards in Powerplant Deck (29):
1

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

1 IDG 1/2 caution message
2. HOT = IDG auto disconnects
3. LOP = shear pin shears

2

What's the primary bleed source on the ground

APU - turns off in climb detention

3

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

PERF MENU

4

When does the HPV open?

When 6th stage doesn't supply enough pressure

5

What comprises the N1 and N2 sections?

1. N1 = high pressure bypass fan, low pressure turbine
2. N2 = compressor, high pressure turbine

6

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

1. Allows the starting of the engine when it's free spinning
2. FADEC will stop at 45%

7

How are thrust reverser actuated?

Electrically controlled, hydraulically actuated

8

What are normal/abnormal thrust modes

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

9

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

B

10

What would happen if you pressed HIGH PWR SCHEDULE

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

11

When is APR armed?

When BOTH thrust levers are within 8% of TOGA

12

Does an engine start effect ISOL valve?

Yes it opens it

13

What's max ITT during start

810*

14

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

1. 85% bypass
2. 15% core

15

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

Variable geometry

16

Describe variable geometry system

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

17

What is the function of the operability valve?

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

18

What actuates the operability valve?

FADEC by high pressure fuel

19

What is attached to the accessory gear box?

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

20

What compressor stages do we get bleed air?

1. 6th stage normally
2. 10th stage under high loads

21

What purpose do we pull off bleed air?

1. Starting
2. Pressurization
3. Anti-ice

22

How many injectors and how many igniters

18 objectors and 2 igniters ( A and B )

23

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

Electrically

24

When will the FADEC deactivate the APR

After landing

25

Describe the auto-relight function

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

26

How much thrust in the max power detent.

14,510 lbs.

27

How are the A and B igniters powered?

A - through the AC essential bus
B - through the battery bus

28

How close must the N1s be in order to achieve syncing

1 1/2 percent

29

What protection prevents engine over speed

The FADEC at 107% N2