Powerplant

Question 1

What is the thrust rating without APR/with APR?

Answer 1

13,560 lbs/14,750 lbs

Question 2

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

Answer 2

ISA +35c

Question 3

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

Answer 3

-40c

Question 4

What is the Max altitude for a windmill start?

Answer 4

21,000 ft MSL

Question 5

Max engine to engine N2 split at ground idle power?

Answer 5

2%

Question 6

How much of the thrust is produced by core air?

Answer 6

Approximately 20%

Question 7

How much thrust is produced by by-pass air?

Answer 7

Approximately 80%

Question 8

How many stages of compression do we have?

Answer 8

The engine is equipped with a 10 stage axial flow compressor

Question 9

What accessories are driven off the N2 accessory gear box?

Fish oil plus

Answer 9

engine driven Fuel pump
IDG
air turbine Starter
engine driven Hydraulic pump
OIL pump
FADEC alternator

Question 10

What is the engine bleed air used for?

Answer 10

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

Question 11

What stages of bleed air are used?

Answer 11

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

Question 12

What allows 10th stage bleed air availability?

Answer 12

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

Question 13

How many igniters are installed on each engine?

Answer 13

Two, IGN-A and IGN-B

Question 14

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

Answer 14

20% or greater N2

ITT

Question 15

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

Answer 15

42 PSI to a maximum of 80% N2

Question 16

When will APR arm on takeoff?

Answer 16

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

Question 17

When will the APR system activate?

Answer 17

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

Question 18

What occurs when the APR system activates?

Answer 18

FADEC commands an N1 speed increase dependent on thrust lever position

Question 19

What indication will we have of APR activation?

Answer 19

Green APR icon on operable engine N1 gauge

Question 20

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

Answer 20

Yes

Question 21

What is used to deploy and stow the thrust reversers?

Answer 21

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

Question 22

How are the thrust reversers deployed?

Answer 22

Thrust levers must be set to 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 23

What is occurring during thrust reverser deployment?

Answer 23

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

Question 24

What indications will be seen with normal thrust reverser deployment?

Answer 24

Green REV icon on N1 gauges

Question 25

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

Answer 25

900 - 60 kts | 700 - 75 kts

Question 26

What happens when a thrust reverser inadvertently deploys?

Answer 26

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

Question 27

What are the indications of an inadvertent thrust reverser deployment?

Answer 27

Amber REV icon on N1 gauge, REV UNLOCKED caution message.

Question 28

What is the normal air source for engine starts?

Answer 28

APU or cross-bleed if doing a single engine taxi

Question 29

What source is used if the APU is INOP?

Answer 29

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 30

Where is the high pressure air ground 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

What is the CRJ-900 Powerplant Model Number?

Answer 32

General Electric CF34-8C5