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CRJ700 Systems > Powerplant > Flashcards

Powerplant Flashcards

1
Q

What type of engines does the airplane have?

A

General Electric CF34-8C5B1

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2
Q

What is the maximum N1 rpm?

A

99.4% which is the top of the green arc

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3
Q

What is the maximum N2 rpm?

A

99.3% which is the top of the green arc

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4
Q

What is the maximum oil temperature?

A

164’

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5
Q

What is the minimum oil pressure?

A

25 psi

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6
Q

The engines must remain at idle after start until what parameters are reached?

A

Don not exceed 75% N1 for 2 minutes or until all operating indications are in the normal range, which ever is longer

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7
Q

What is the engine cool down limitation?

A

After landing the engine must be at or near thrust for two minutes prior to shutdown

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8
Q

White drives the accessory gear box?

A

The N2 compressor, which is driven by the high pressure turbine

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9
Q

What items are on he accessory gear box?

A 
Hydraulic pump
Fuel pump (3 pumps on a shaft)
Oil pump
FADEC alternator 
Integrated drive generator 
Air turbine starter
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10
Q

There are three interconnected fuel pumps with in the accessory gear box. What are they?

A

Low pressure pump
High pressure pump
Motive flow pump

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11
Q

What are the rates thrust outputs of the engines?

A

Normal is 12670 and APR 13790

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12
Q

What drives the N1 fan?

A

The low pressure turbine

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13
Q

How many stages is the low pressure turbine?

A

Four

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14
Q

What comprises an engine stage?

A

Stage includes a set of stators and rotors.
Compressor section: spin rotors blades simultaneously accelerate and compress air. Stator vanes remain fixed and direct air to the next set of rotor vanes.

Turbine section: escaping exhaust gas spins turbine rotors. Turbine rotors used to spin the compressor blades through an interconnected concentric shaft.

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15
Q

How much of the engines overall thrust is provided by he N1 fan?

A

80%

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16
Q

What powers the Variable Geometry vanes?

A

Fuel pressure directed by the FADEC

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17
Q

What is the operability valve?

A

Works in conjunction with the VG vanes to remove internal air pressure from the compressor section of the engine reducing the risk of a compressor stall.

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18
Q

What powers the operability valve?

A

Fuel pressure directed by the FADEC

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19
Q

How is fuel heated prior to combustion?

A

Through the use of a fuel/oil heat exchanger

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20
Q

How many channels does the FADEC have, and when do the channels change?

A

There are 2 channels A and B. They change when N2 rpm falls below 7% on every other engine shut down

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21
Q

How many FADEC channels are in use at once?

A

One channel commands the engine. The other channel monitors and is in standby Incase the commanding channel fails

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22
Q

Is there ever a time when both FADEC channels will command the engine simultaneously?

A

In an over speed both FADEC channels will command the fuel valves to bring the speed into normal range

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23
Q

What happens if both FADEC channels fail or the FADEC loses power?

A

The engine will fail

24
Q

Can the left engines FADEC Control the right engine?

A

No

25
Q

Do the left and right engines FADEC crosstalk to each other?

A

Yes. They compare engine speed and thrust reverser position information.

26
Q

Whip cross talking when will one engines FADEC assume the other engine has failed?

A

When the difference is at least 15% N1

27
Q

When an engine fails, what will the operative engines FADEC automatically command?

A

APR in the TOGA detent, MCT in the Climb detent and a proportionate increase throughout the cruise range

28
Q

What will the FADEC command if a thrust reverser deploys in flight?

A

It will reduce that engines thrust to idle

29
Q

At what speed does the FADEC lock in the final N1 computation during takeoff?

A

65kts

30
Q

What powers the FADEC?

A

Aircraft electrical power with an N1 of less than 50% and the FADEC alternator with an N2 of greater than 50%

31
Q

If we wait for the FADEC to shut the engine down during a hot start are we guaranteed that the ITT limit will not be exceeded?

A

No

32
Q

Will the engine automatically shut down for a hot start on the ground?

A

Yes

33
Q

Is there ITT protection and subsequent auto-shutdown in flight?

A

No

34
Q

What is the time limit for single engine APR thrust?

A

10minutes

35
Q

What is the time limit for normal or FLEX thrust?

A

5minutes

36
Q

When will the L or R oil level LO status message appear?

A

Below 57% with the engine running and below 80% with the engine stopped

37
Q

What is FLEX thrust?

A

It’s a reduced power setting for takeoff calculated using an assumed temperature

38
Q

When using FLEX thrust for takeoff what must the PIC verify prior to takeoff?

A

The PIC must verify the computed thrust displayed on the primary display is equal to or greater than the required QRH vol 1

39
Q

What color will the FLEX thrust rating be displayed in on the primary display?

A

Magenta

40
Q

When is FLEX thrust not permitted?

A

Wing/Cowl anti-ice bleeds are in use
Runway is contaminated
Warnings or forecast windshear/downdrafts
Anti skid system inop

41
Q

What stages of the engine is bleed air extracted from?

A

6th and 10th stage

42
Q

Can both stages be used at once?

A

No

43
Q

What powers the igniters?

A

Igniter A is powered by the AC essential bus and igniter B is powered by the aircraft’s battery and an inverter

44
Q

When is the use of continuous ignition required?

A

Bc of thunderstorms
Moderate to sever turbulence
Moderate to severe rain
Operation on contaminated runway

45
Q

When will continuous ignition fire automatically?

A

FADEC senses flame out
Approaching a stickshaker during a stall
Disruption of airflow detected through the engine

46
Q

How are the thrust reversers actuated?

A

Hydraulically

47
Q

How are the thrust reversers locked?

A

Hydraulically and mechanically

48
Q

What is he maximum ITT for engine start on the ground and in flight?

A

120’ on the ground and 90’ inflight

49
Q

What is the maximum altitude for engine relight?

A

FL120

50
Q

What are the 5 different engine idles?

A 
Flight idle 
Approach idle 
Landing idle
Reverse idle
Ground idle
51
Q

When is APR armed on takeoff?

A

When within 8% of target thrust

52
Q

When is the go around mode armed on approach?

A

With the gear extended or the flaps greater than 20

53
Q

What did the blue circle indicate on the N1 gauge during cruise flight?

A

The maximum thrust setting for cruise

54
Q

What are the engine warmup limitations?

A

Engines must remain at idle until oil pressure is in the normal range. Don’t exceed 75% of N1 until all indications are in the green or two minutes has passed whichever is greater

55
Q

What is the engine cool down limitation?

A

After landing the engine must be at or near idle thrust for two minutes prior to shutdown

CRJ700 Systems (17 decks)

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