Powerplant

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

13560 lbs / 14,750 lbs

Question 3

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

Answer 3

ISA + 35c

Question 4

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

Answer 4

-40c

Question 5

What is the Max Altitude for a windmill start?

Answer 5

21,000 ft MSL

Question 6

N2 for start?

Answer 6

> = 20%

Question 7

Max engine to engine N2 split at ground idle power?

Answer 7

2%

Question 8

How much of the thrust is produced by core air?

Answer 8

Approx. 20%

Question 9

How much of the thrust is produced by by-pass air?

Answer 9

Approx. 80%

Question 10

How many stages of compression do we have?

Answer 10

Engine has a 10 stage axial flow compressor

Question 11

<p>

| What accessories are driven off the N2 accessory gear box?</p>

Answer 11

<p>
	<strong>(FISH-OIL + FADEC ALT)</strong></p>
<p>
	Fuel Pump<br />
	IDG<br />
	Starter<br />
	Hydraulic Pump<br />
	Oil Pump<br />
	FADEC ALT</p>

Question 12

<p>

| What is the engine bleed air used for?</p>

Answer 12

<p>
	<strong>(ASAP)</strong><br />
	Anti-Ice<br />
	Starting<br />
	A/C<br />
	Pressurization</p>

Question 13

What stages of bleed air are used?

Answer 13

normally 6th stage, 10th stage used when demand exceeds capability of the 6th stage

Question 14

What allows 10th stage bleed air availability?

Answer 14

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

Question 15

How many igniters are installed on each engine?

Answer 15

Two, IGN-A, IGN-B

Question 16

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

Answer 16

20% or greater N2, ITT < 120c

Question 17

When will APR arm on takeoff?

Answer 17

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

Question 18

How can you determine if the APR system has armed?

Answer 18

APR ARMED advisory message

Question 19

When will the APR system activate?

Answer 19

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 20

What occurs when the APR system activates?

Answer 20

FADEC commands an N1 speed increase dependent on thrust lever position

Question 21

What indication will we have of APR activation?

Answer 21

Green APR icon on operable engine N1 gauge

Question 22

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

Answer 22

Yes

Question 23

What system is used to deploy and stow the thrust reversers?

Answer 23

Hydraulics

Question 24

How are thrust reversers deployed?

Answer 24

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 solenoid lock releases allowing N1 to increase with the thrust reverse levers

Question 25

What is occurring during thrust reverser deployment?

Answer 25

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

Question 26

What indications will be seen with normal thrust reverser deployment?

Answer 26

Green REV icon on N1 gauges

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 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

Under left engine nacelle

Question 32

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

Answer 32

50% N2

Question 33

IGN B is powered from:

Answer 33

Battery Bus utilizing a static inverter

Question 34

Cross bleed air starts require that:

Answer 34

Operating engine to achieve 42 psi