Power Plant

Question 1

What is the CRJ-900 Powerplant Model Number

Answer 1

General Electric CF34-8C5

Question 2

What is the thrust rating without APR/with APR

Answer 2

13,560 lbs/14,750 lbs

Question 3

What is the Max ambient air temperature for takeoff and landing?

Answer 3

ISA + 40C, Max 51C

Question 4

What is the Min ambient air temperature for takeoff and landing

Answer 4

-40°C

Question 5

What is the Max Altitude for a windmill start

Answer 5

21,000 ft MSL

Question 6

Max engine to engine N2 split at ground idle power

Answer 6

2%

Question 7

How much of the thrust is produced by core air

Answer 7

Approximately 20%

Question 8

How much thrust is produced by by-pass air

Answer 8

Approximately 80%

Question 9

How many stages of compression do we have

Answer 9

The engine is equipped with a 10 stage axial flow compressor.

Question 10

What accessories are driven off the N2 accessory gear box?

fish oil plus

Answer 10

Engine driven fuel pump, 
IDG, air turbine starter, 
Engine driven hydraulic pump, 
Oil pump, 
FADEC alternator

Question 11

What is the engine bleed air used for

Answer 11

Engine start, air conditioning, pressurization, wing and cowl anti-ice

Question 12

What stages of bleed air are used

Answer 12

Normally 6th stage,10th stage used when demand exceeds capability of 6th stage

Question 13

What allows 10th stage bleed air availability

Answer 13

Air Conditioning System Controller (ACSC) automatically opens the High Pressure Valve (HPV)

Question 14

How many igniters are installed on each engine

Answer 14

Two, IGN-A and IGN- B

Question 15

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

Answer 15

20% or greater N2, ITT <120°C

Question 16

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

Answer 16

42 PSI to a maximum of 80% N2

Question 17

When will APR arm on takeoff

Answer 17

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

Question 18

When will the APR system activate

Answer 18

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

Question 19

What occurs when the APR system activates

Answer 19

FADEC commands an N1 speed increase dependent on thrust lever position

Question 20

What indication will we have of APR activation

Answer 20

Green APR icon on the N1 gauge.

Question 21

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

Answer 21

Yes

Question 22

What is used to deploy and stow the thrust reversers

Answer 22

Hydraulics

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

Question 23

How are the thrust reversers deployed

Answer 23

Thrust levers must be at idle. The reverse
thrust levers are raised by engaging the
thrust reverse release triggers. A solenoid
lock stops reverse thrust lever movement while the reversers deploy. Once deployed, the lock releases and N1 may be increased by raising the reverse thrust levers

Question 24

What is occurring during thrust reverser deployment

Answer 24

The translating cowls move aft. The bypass air is redirected through cascade vanes which redirect the air forward

Question 25

What indications will be seen with normal thrust reverser deployment

Answer 25

Green REV icon on N1 gauges

Question 26

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

Answer 26

CRJ900: 60 kts

Question 27

What happens when a thrust reverser inadvertently deploys

Answer 27

FADEC commands thrust to be set to idle on affected engine

Question 28

What are the indications of an inadvertent thrust reverser deployment

Answer 28

Amber REV icon on N1 gauge,

REV UNLOCKED caution message

Question 29

What is the normal air source for engine starts

Answer 29

APU or cross-bleed if doing a single engine taxi

Question 30

What source is used if the APU is INOP

Answer 30

Ground air cart or bottle attached to the high pressure air ground connection to start one engine. A cross bleed start is then used to start the other engine after clearing it with ground control

Question 31

Where is the high pressure air ground connection located

Answer 31

On the fuselage, aft of the aft cargo bay door.

Question 32

When will the starter cut-out during an engine start

Answer 32

50% N2