Powerplant

Question 0

What is the CRJ 700 power plant model number?

Answer 0

Either General Electric CF34-8C1 or

General Electric CF34-8C5B1

Question 1

What is the CRJ 900 power plant 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 + 35 Celsius

Question 4

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

Answer 4

• 40 Celsius

Question 5

What is the Max altitude for a windmill start?

Answer 5

21,000 feet

Question 6

Max engine to engine N2 split at ground idle power?

Answer 6

2%

Question 7

How much thrust is produced by core air?

Answer 7

About 20%

Question 8

How much thrust is produced by by-pass air?

Answer 8

About 80%

Question 9

How many stages of compression do we have and what type of compressor do we have?

Answer 9

The engine is equipped with a 10 stage axial flow compressor

Question 10

What accessories are driven off of the N2 accessory gear box?

Answer 10

Engine driven fuel pump
IDG
Air turbine starter
Engine driven hydraulic pump
Oil pump
FADEC alternator

Question 11

What is 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 will be used in the event the capacity of the 6th stage has been exceeded

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 and ITT <120

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 max 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, N1’s 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 increase dependent on thrust lever position.

Question 20

What indication will we have of APR activation?

Answer 20

Green APR icon on operable engine 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 - Left reverser uses hydraulic system 1 and Right 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. 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 stowed or at idle?

Answer 26

CRJ 900: 60 KTS

CRJ 700: 75 KTS

Question 27

What happens when a thrust reverser inadvertently deploys?

Answer 27

FADEC commands reverser to close and thrust 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 for engine start is used if the APU is inop?

Answer 30

Ground air cart attached to the high pressure air ground connection to start one engine. A cross-bleed start is used to start the other engine once it is cleared with ground control

Question 31

Where is the high pressure air ground connection located?

Answer 31

Under the left engine nacelle

Question 32

When will the start cut-out during an engine start?

Answer 32

50% N2