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CRJ700 Systems > PowerPlant > Flashcards

PowerPlant Flashcards

1
Q

What drives the accessory gear box?

A

The N2 Compressor, which is driven by the high pressure turbine.

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2
Q

What items are on the accessory gear box?

A
  • Hydraulic Pump
  • Fuel pump (3 pumps on 1shaft)
  • Oil Pump
  • FADED alternator
  • Integrated drive generator
  • Air Turbine Starter
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3
Q

There are threats interconnected fuel pumps within the accessory gear box. What are they?

A
  • Low pressure
  • High pressure
  • Motive flow pump
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4
Q

What are the rates thrust outputs of the engine?

A

Normal 12,670 and APR 13,790

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5
Q

What drives the N1 fan?

A

The low pressure turbine

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6
Q

How many stages is the low pressure turbine?

A

Four

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7
Q

What comprises an engine stage?

A

A stage includes a set of stators and rotors. In the compressor section of the engine rotor blades spin to simultaneously accelerate and compress air. The stater vanes remain fixed and direct air to the next set of rotor blades. In the turban section of the engine escaping exhaust gas spin the turbine rotors. The turbine rotors are used to spin the compressor blades through an interconnected concentric shaft running through the center of the engine. Stator veins are used in the turbine section to efficiently direct the flow of exhaust to the next set of turbine rotors.

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8
Q

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

A

80%

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9
Q

What powers the variable geometry vanes?

A

Fuel pressure directed by the FADEC.

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10
Q

What is the operability valve?

A

The operability valve 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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11
Q

What powers the operability valve?

A

Fuel pressure directed by the FADEC

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12
Q

How is fuel heated prior to combustion?

A

Through the use of a fuel oil heat exchanger

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13
Q

How many channels does he have FADEC have and why do the channels change?

A

There are two channels a and B. The channels change when the N2 RPM falls below 7% on every other engine shut down.

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14
Q

How many FADEC channels are in use at once?

A

One channel commands the engine while the other channel monitors that controlling channel and is in standby in case the commanding channel fails.

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15
Q

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

A

In an engine over speed situation both FADEC channels will command the fuel valve to close to bring the speed into the normal range.

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16
Q

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

A

The engine Will fail.

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17
Q

Can the left engines FADEC control the right engine?

A

No

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18
Q

Do the left and right engines FADEC’s cross talk with each other?

A

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

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19
Q

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

A

When there is a difference of at least 15% N1.

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20
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.

21
Q

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

A

It will reduce that engines thrust to idle.

22
Q

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

A

65 KIAS

23
Q

What powers the FADEC?

A

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

24
Q

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

A

No

25
Q

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

A

Yes

26
Q

Is there ITT protection and subsequent auto shut down in flight?

A

No

27
Q

What is the limit for single engine APR thrust?

A

10 minutes

28
Q

What is the Time limit of normal FLEX thrust?

A

Five minutes

29
Q

When will the L or R oil lever L0 status message appear?

A

Below 75% with the engine running and below 80% with the engine stopped

30
Q

What is FLEX thrust?

A

It is a reduced power setting for takeoff calculated using an assumed temperature.

31
Q

When using FLEX thrust for takeoff what must the pilot in command verify prior to takeoff?

A

The PIC must verify that the computed thrust displayed on the primary display is equal to or greater than the required in QRH volume one.

32
Q

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

A

Magenta

33
Q

When is FLEX thrust permitted?

A
  • Wing and or towel anti-ice bleeds are in use
  • Runway is contaminated (more than 1/8 inch) with standing slush/water/snow/ice
  • Warning or forecast of wind shear or downdrafts exist
  • Anti-skid system is in operative
34
Q

What stages of the engine is bleed air extracted from?

A

Sixth and 10th stage

35
Q

Can both stages be used at once?

A

No

36
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 inverter.

37
Q

When is the use of continuous ignition required?

A
  • Fight in vicinity of thunderstorms -Fight through moderate or severe turbulence
  • Flight through moderate or severe intensity rainfall
  • Operations on a contaminated runway
38
Q

When will that continuous ignition fire automatically?

A
  • When the FADEC senses a flame out
  • When approaching a stick shaker during a stall
  • When a disruption of airflow is detected through the engine
39
Q

How are thrust reversers actuated?

A

Hydraulically

40
Q

How are the thrust reversers locked?

A

Hydraulically and mechanically

41
Q

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

A

120° on the ground and 90° in flight

42
Q

What is the maximum altitude for engine relight?

A

Flight level 210

43
Q

Are the five different engine idols?

A
  • Flight idol
  • approach idol
  • landing idol
  • reverse idol
  • ground idol
44
Q

When is APR armed on takeoff?

A

When with an 8% of target thrust

45
Q

When is go around mode armed on approach?

A

With the gear extended or flaps greater than 20

46
Q

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

A

The maximum thrust setting for cruise

47
Q

What are the engine warm up limitations?

A

The engines must remain at Idol until the oil pressure is in the normal range. Do not exceed 75% N1 until all indications are in the green or two minutes have passed which ever is greater.

48
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 shut down

CRJ700 Systems (17 decks)

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