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CRJStudy -700 > Powerplant > Flashcards

Powerplant Flashcards

1
Q

What drives the accessory gear box?

A

The N2 compressor, which is driven bu the high pressure turbine.

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2
Q

What items are on the accessory gear box?

A
  • Hydraulic pump
  • Fuel pump (3 interconnected on common shaft)
  • Oil pump (integral pump & reservoir)
  • FADEC alternator
  • Integrated drive generator
  • Air turbine starter
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3
Q

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

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

What are the rated thrust outputs of the engines?

A

Normal is 12,670 and APR is 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.

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8
Q

How much of the egine’s overall thrust is provided by the N1 fan?

A

80%

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9
Q

What powers the Variable Geometry (VG) 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 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 the FADEC have, and when do the channels change?

A

Two. The channels change with the N2 RPM falls below 7% on every other engine shutdown.

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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 the 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 overspeed situation both FADEC channels will command the fuel valves 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 engine’s FADEC control the right engine?

A

No.

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18
Q

Do the left and right engine’s FADECs cross talk with one another?

A

Yes. They compare engine speed and thrust reverser information.

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19
Q

While cross talking, when will one engine’s 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 oeprative engine’s 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 the FADEC command is a thrust reverser deploys in flight?

A

It will reduce that engine’s 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 are we gayranteed that the ITT limit will not be exceeded?

A

No.

25
Q

Will the engine automatically shutdown for a hot start on the ground?

A

Yes.

26
Q

Is there ITT protection and subsequent auto shutdown in flight?

A

No.

27
Q

What is the time limit for single engine APR thrust?

A

10 minutes.

28
Q

What is the time limit for normal or FLEX thrust?

A

5 minutes.

29
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.

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 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 that required in QRH v.1.

32
Q

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

A

Magenta.

33
Q

When is FLEX thrust not permitted?

A
  • Wing and/or cowl anti-ice bleeds are in use.
  • Runway is contaminated with standing water, slush, snow, or ice.
  • Warnings or forecasts of windshear or downdrafts exist.
  • Antiskid system is inoperative.
34
Q

What stages of the engine is bleed air extracted from?

A

6th 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 battery and an inverter.

37
Q

When is the use of continuous ignition required?

A
  • Flight in the vicinity of thunderstorms.
  • Flight through moderate or severe turbulence.
  • Flight through moderate or severe rain.
  • Operations on a contaminated runway.
38
Q

When will the continous ignition fire automatically?

A
  • When the FADEC senses a flameout.
  • When approaching a stickshaker during a stall.
  • When a disruption of airflow is detected through the engine.
39
Q

How are the 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, 90 in flight.

42
Q

What is the maximum altitude for engine re-light?

A

FL210

43
Q

What are the five different engine idles?

A
  • Flight idle
  • Approach idle
  • Landing idle
  • Reverse idle
  • Ground idle
44
Q

When is APR armed on takeoff?

A

When within 8% of target thrust.

45
Q

When is the go-around mode armed on approach?

A

With the gear extended or the flaps greater than 20.

46
Q

What does the blue circle indicate on the N1 guage during cruise (CRZ) flight?

A

The maximum thrust setting for cruise (less than MCT).

47
Q

What are the engine warm up limitations?

A

The engines must remain at idle until the oil pressure is in the normal range. Do not exceed 75% N1 until all indications are in the green or two minutes has 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 shutdown.

CRJStudy -700 (16 decks)

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