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CRJ-900 Limitations > Powerplant > Flashcards

Powerplant Flashcards

1
Q

How man stages have compressor variable geometry (CVG) vanes

A

First 4 Stages

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2
Q

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

A

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

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3
Q

APR thrust is limited to how long?

A

10 min single engine

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4
Q

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

A

General Electric CF34-8C5

Either GE CF34-8C1 or CF34-8C5B1

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5
Q

What is the trust rating normal and with APR

A

13,560 and with APR 14,750

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6
Q

What is the max ambient air temperature for takeoff and landing

A

ISA + 35 c

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7
Q

What is the min ambient air temperature for takeoff and landing

A

-40c

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8
Q

What is the max altitude for windmill start

A

21,000 ft MSL

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9
Q

Max engine to engine N2 split at ground idle power

A

2%

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10
Q

How much of the trust is produced by core air

A

Approximately 20%

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11
Q

How much thrust is produced by by-pass air

A

Approximately 80%

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12
Q

How many stages of compression do we have

A

10 stage axial flow compressor

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13
Q

What accessories are driven off the N2 accessory gear box

A 
Engine driven fuel pump
IDG (integrated driven generator)
Air turbine starter
Engine driven hydraulic pump
Oil pump
FADEC alternator
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14
Q

What is engine bleed air used for

A

Engine start
Air conditioning
Pressurization
Wing and cowl anti-ice

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15
Q

What stages of bleed air are used

A

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

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16
Q

What allows 10th stage bleed air availability

A

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

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17
Q

How many igniters are installed on each engine

A

Two, IGN-A and IGN-B

18
Q

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

A

20% or grater N2 ITT less than 120c

19
Q

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

A

42 PSI to a maximum of 80% N2

20
Q

When will APR arm on takeoff

A

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

21
Q

When will the APR system activate

A

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

22
Q

What occurs when the APR system activates

A

FADEC commands an N1 speed increase dependent on thrust lever position

23
Q

What indication will we have of APR activation

A

Green APR icon on operable engine N1 gauge

24
Q

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

A

Yes

25
Q

What is used to deploy and stow the thrust reversers

A

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

26
Q

What indication will be seen with normal thrust reverser deployment

A

Green REV icon on N1 gauge

27
Q

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

A

CRJ-900 60 kts

CRJ-700 75 kts

28
Q

What happens when a thrust reverser inadvertently deploys

A

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

29
Q

What are the indications of an inadvertent thrust reverser deployment

A

Amber REV icon on N1 gauge, REV UNLOCKED caution message

30
Q

Where is the high pressure air ground air connection located

A

Under left engine nacelle

31
Q

When will the starter cut out during an engine start

A

50% N2

32
Q

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

A

99.5%

33
Q

ITT temps Normal T/O

A

963 for the first 2 min,

947 for the next 3 min

34
Q

ITT APR Thrust Go-Around

A

1006 for the first 2 min

990 for the next 3 min

35
Q

Oil pressure T/O power / Max continues

A

45-95 PSI

36
Q

How many channels does FADEC have

A

2 Channels

37
Q

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

A

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

38
Q

What is N2 ground idle

A

55%-65% N2

39
Q

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

A

Yes, the two FADEC systems talk

40
Q

When is takeoff N1 thrust locked in

A

At 65 KIAS

41
Q

When does FADEC change the N1 setting after takeoff?

A

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

CRJ-900 Limitations (24 decks)

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