Powerplant

Question 1

How man stages have compressor variable geometry (CVG) vanes

Answer 1

First 4 Stages

Question 2

If engine oil levels have NOT been serviced within the preceding 36 hrs what restrictions applies?

Answer 2

Engine oil levels must be checked following each shutdown after 3 minutes but before 2 hours following engine shutdown.

Question 3

APR thrust is limited to how long?

Answer 3

10 min single engine

Question 4

What is the CRJ-900 power plant model number and 700

Answer 4

General Electric CF34-8C5

Either GE CF34-8C1 or CF34-8C5B1

Question 5

What is the trust rating normal and with APR

Answer 5

13,560 and with APR 14,750

Question 6

What is the max ambient air temperature for takeoff and landing

Answer 6

ISA + 35 c

Question 7

What is the min ambient air temperature for takeoff and landing

Answer 7

-40c

Question 8

What is the max altitude for windmill start

Answer 8

21,000 ft MSL

Question 9

Max engine to engine N2 split at ground idle power

Answer 9

2%

Question 10

How much of the trust is produced by core air

Answer 10

Approximately 20%

Question 11

How much thrust is produced by by-pass air

Answer 11

Approximately 80%

Question 12

How many stages of compression do we have

Answer 12

10 stage axial flow compressor

Question 13

What accessories are driven off the N2 accessory gear box

Answer 13

Engine driven fuel pump
IDG (integrated driven generator)
Air turbine starter
Engine driven hydraulic pump
Oil pump
FADEC alternator

Question 14

What is engine bleed air used for

Answer 14

Engine start
Air conditioning
Pressurization
Wing and cowl anti-ice

Question 15

What stages of bleed air are used

Answer 15

Normal 6th stage and 10th stage used when demand exceeds 6th stage

Question 16

What allows 10th stage bleed air availability

Answer 16

Air conditioning system controller (ACSC) automatically opens the high pressure valve (HPV)

Question 17

How many igniters are installed on each engine

Answer 17

Two, IGN-A and IGN-B

Question 18

What are the required parameters before fuel is introduced during a ground engine start

Answer 18

20% or grater N2 ITT less than 120c

Question 19

What is the air pressure requirement provided by the operating engine to initiate a cross-bleed start

Answer 19

42 PSI to a maximum of 80% N2

Question 20

When will APR arm on takeoff

Answer 20

Engine speed within 8% of scheduled takeoff power normal or flex

Question 21

When will the APR system activate

Answer 21

Thrust levers in TOGA, Normal or flex thrust scheduled, and if N1s differ by 15% or greater or when thrust levers are set in the MAX POWER detent

Question 22

What occurs when the APR system activates

Answer 22

FADEC commands an N1 speed increase dependent on thrust lever position

Question 23

What indication will we have of APR activation

Answer 23

Green APR icon on operable engine N1 gauge

Question 24

If an engine fails during a go-around, will the APR system activate

Answer 24

Yes

Question 25

What is used to deploy and stow the thrust reversers

Answer 25

Hydraulics L reverser uses hydraulic system 1 R reverser uses hydraulic system 2

Question 26

What indication will be seen with normal thrust reverser deployment

Answer 26

Green REV icon on N1 gauge

Question 27

When do the thrust revers need to be either stowed or at idle

Answer 27

CRJ-900 60 kts | CRJ-700 75 kts

Question 28

What happens when a thrust reverser inadvertently deploys

Answer 28

FADEC commands reverser to close and thrust set to idle on affected engine

Question 29

What are the indications of an inadvertent thrust reverser deployment

Answer 29

Amber REV icon on N1 gauge, REV UNLOCKED caution message

Question 30

Where is the high pressure air ground air connection located

Answer 30

Under left engine nacelle

Question 31

When will the starter cut out during an engine start

Answer 31

50% N2

Question 32

N1 max continuous, normal T/O, APR or Go around

Answer 32

99.5%

Question 33

ITT temps Normal T/O

Answer 33

963 for the first 2 min, | 947 for the next 3 min

Question 34

ITT APR Thrust Go-Around

Answer 34

1006 for the first 2 min | 990 for the next 3 min

Question 35

Oil pressure T/O power / Max continues

Answer 35

45-95 PSI

Question 36

How many channels does FADEC have

Answer 36

2 Channels

Question 37

How long does FADEC hold higher idle on landing for reverse thrust

Answer 37

5 seconds if thrust reverser not used within the 5 seconds ground idle is set.

Question 38

What is N2 ground idle

Answer 38

55%-65% N2

Question 39

Will FADEC increase The N1 on the good engine if you have an engine failure?

Answer 39

Yes, the two FADEC systems talk

Question 40

When is takeoff N1 thrust locked in

Answer 40

At 65 KIAS

Question 41

When does FADEC change the N1 setting after takeoff?

Answer 41

When the aircraft passes through 400 ft and the throttles are moved out of the TOGA detent