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GoJet Study Guide 24 July 18 > Powerplant > Flashcards

Powerplant Flashcards

Corrected and verified

1
Q

When does engine synchronization occur?

A

When both engines N1 are within 1.5 percent of each other the sync can be activated. The right engine N1 will be synced to the left with a tolerance of 2.5 percent

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2
Q

What is the engine ignition powered by?

A

System A from AC Essential Bus and System B from the Battery Bus through a static inverter.

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3
Q

What are the FADECs powered by?

A

The DC electric system below 50% N2 and by a dedicated FADEC PMA alternator above 50% N2.

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4
Q

What is the minimum bleed air pressure for engine start?

A

45 psi +/-3 psi.

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5
Q

What is the minimum oil temperature for start on the ground?

A

-40 degrees C-.

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6
Q

The CF34-8C5B1 has a normal thrust rating of ________ pounds. At APR power, this increase to ________.

And crj900

A

12,670/13,790

13,360/14,510

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7
Q

Bypass air from the N1 Fan produces approximately __________of the engine thrust.

A

80%

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8
Q

Fuel pressure from the fuel metering unit is used by FADEC to operate

A

The variable geometry guide vanes of the N2 compressor and the Operability Valve

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9
Q

During start, the thrust lever should be moved from shutoff at _________.

A

20% N2 ITT below 120

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10
Q

Starter disengagement should occur at _______.

A

50% N2

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11
Q

Continuous ignition must be on if:

A

Takeoff/landing on contaminated runways

  • -Moderate or greater turbulence
  • -Moderate or greater rainfall
  • -Vicinity of TS
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12
Q

What will happen if both sources of power to FADEC fail?

A

The engine will shut down

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13
Q

The two channels of each FADEC will never make a simultaneous input to the engine except _________________.

A

When an engine overspeed condition is sensed

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14
Q

With an engine failure, FADEC will schedule One engine Out (OEO) power as follows:

A

APR power if thrust lever is in TOGA detent
MCT power if thrust lever in CLB detent
Proportional increase in the cruise range

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15
Q

Alerting of a pending oil filter bypass or oil chip detection will be presented to the pilot on the EICAS system

A

FALSE–will be indicated on a panel in the AFT equipment bay.

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16
Q

Gauges are available to alert the pilot to vibration exceedences in both the N1 and N2 sections of each engine.

A

FALSE–Gauges only for N1–VIB Icon will appear inside the N2 gauge

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17
Q

How many different idle power settings are available from FADEC.

A

FIVE—Flight Idle, Approach Idle, Landing Idle, Reverse Idle and Ground Idle.

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18
Q

How is engine oil temperature kept under control?

A

A fuel/oil heat exchanger uses cold fuel to reduce oil temperature. It also warms the fuel to keep it within limits.

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19
Q

In the event of FADEC failure, the other engine FADEC can provide fuel control of both engines

A

FALSE

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20
Q

One Engine Out (OEO) fuel scheduling from FADEC will occur when the N1 speed difference between the engines exceeds _____.

A

15%

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21
Q

How will you know that APR power is being scheduled by FADEC?

A

A green APR icon will appear inside the N1 gauge.

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22
Q

What will selection of the High Power schedule switchlight do?

A

Set MCT power on both engines. However its use is prohibited by GoJet pilots and Bombadier respectively

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23
Q

FADEC continues to update its power calculation during takeoff up to _____. It locks in this setting until ___________.

A

65 Kts/400 ft AGL or thrust lever moved from TOGA detent

24
Q

During a starter assisted engine start, you should not engage the air turbine starter if the N2 RPM exceeds ___________.

A

45%

25
Q

Engine crossbleed starts are accomplished using ___________.

A

Bleed air from the other operating engine.

26
Q

What occurs during a thrust reverser deployment in flight?

A

The FADEC will schedule idle thrust on the engine but the thrust lever will not move.

27
Q

What drives the accessory gearbox?

A

the N2 compressor which is driven by the high pressure turbine.

28
Q

what items are on the accessory gearbox?

A

Hydraulic Pump
Fuel pump ( 3 pumps interconnected on a common shaft)
Oil Pump ( integral oil pump and reservoir)
FADEC alternator
Integrated drive generator (IDI)
Air Turbine Starter

29
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

30
Q

What drives the N1 fan?

A

The low pressure turbine

31
Q

How many stages is the low pressure turbine?

A

Four

32
Q

What compromises an engine stage?

A

a set of stators and rotors. in compressor section engine rotor blades spin to accelerate and compress air. The stator vanes remain fixed and direct air to next set of rotor blades. In turbine section (aft of combustion chamber) escaping exhaust gas spins 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 vanes are used in the turbine section to efficiently direct the flow of exhaust to the next set of turbine rotors

33
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

34
Q

What power the operability valve

A

fuel pressure directed by the FADEC

35
Q

When do the FADEC channels change

A

On shutdown when the N@ rpm falls below 7 percent on every other engine shutdown

36
Q

What powers FADEC?

A

Aircraft electrical power with an N2 of less than 50 percent and FADEC alternator above 50 percent

37
Q

will an engine automatically shutdown for a hot start on the ground?

A

Yes however it will not guarantee that ITT isn’t exceeded

38
Q

What is the time limit for single engine APR thrust?

A

10 minutes

39
Q

What is the time limit for normal or FLEX thrust?

A

5 minutes

40
Q

What is FLEX thrust?

A

A reduced power setting for takeoff calculated using an assumed temperature

41
Q

What color will FLEX thrust be displayed in?

A

Magenta

42
Q

When is FLEX thrust not permitted?

A 
Wing or cowl bleeds in use
TO/LND on contaminated runways
Forecast or actual windshear, downdrafts, LLWS
Anti Skid INOP
Engine cannot achieve max rated thrust
43
Q

What Stages of the engine is bleed air extracted from?

A

6th and 10th stage

44
Q

can both stages of bleed air be used at once?

A

no

45
Q

What powers the igniters?

A

igniter A is powered by AC essential BUS and igniter B is powered by Aircraft battery and Inverter

46
Q

When is Continuous Ignition required?

A

TO/LND contaminated runways
Moderate or heavier Rain
Moderate or heavier turblence
In vicinity of Thunderstorms

47
Q

When will continuous ignition fire automatically?

A

When FADEC sense Flameout
When approaching stickshaker during a stall
When a disruption of airflow is detected through the engine

48
Q

How are thrust reversers actuated?

A

Hydraulically

49
Q

How are thrust reversers locked?

A

Hydraulically and mechanically

50
Q

What is max ITT for engine start ground/flight?

A

ITT 120 ground ITT 90 flight

51
Q

Max altitude for engine relight

A

21000 msl

52
Q

When is APR armed on takeoff?

A

when within 8 percent of target thrust

53
Q

When is go around mode armed on approach?

A

With the gear extended or flaps greater than 20

54
Q

What does the blue circle indicate on the N1 gauge during cruize?

A

The max thrust setting for cruise (less than MCT)

55
Q

What are the engine warmup limitations?

A

must remain idl until the oil pressure is in normal range. Do not exceed 75 percent N1 until all indications are in green or two minutes has passed whichever is greater

56
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

GoJet Study Guide 24 July 18 (26 decks)

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