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RJET E170 Study Guide 12B > Engine > Flashcards

Engine Flashcards

1
Q

What engines are on the aircraft?

A

General Electric CF-34-8E5

- Hi bypass, 2-spool, axial-flow, turbofan

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2
Q

What thrust does the MAX position of the thrust levers provide?

A

The max thrust rating available for dual or single engine

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3
Q

How much thrust do the engines produce?

A

13,800-14,200

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4
Q

How must thrust is available for GA and GA RSV?

A

13,000

14,200

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5
Q

TO1, OEI with ATTCS provides what thrust?

A

14,200

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6
Q

The T/O DATASET menu setting only applies to what?

A

The takeoff mode of flight only

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7
Q

Describe the N1 spool

A
  • Single stage fan

- 4 stage LP turbine

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8
Q

Describe the N2 spool

A
  • 10 stage compressor (gas generator)

- 2 stage HP turbine

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9
Q

How many igniters per engine, are what is the power source?

A

2 per engine, PMA

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10
Q

How many igniters activate for engine start?

A

Ground - 1 igniter (switch in AUTO)

Flight - 2 igniters (switch in AUTO)

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11
Q

What happens when the ignition switch is selected to OVRD?

A

Enables FADEC to activate both exciters when engines are running (ground and flight)

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12
Q

Can the igniters be turned off in flight?

A
  • The switch may be moved to the OFF position but the FADEC disregards the command
  • The OFF position is used for dry motoring on the ground only. It deactivates the ignition system
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13
Q

What are the four ignition indications?

A

A, B, AB (green) and Off (cyan)

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14
Q

What are the green and amber engine vibration ranges

A

Green 0 to 3.9

Amber 4.0 to 5.0

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15
Q

What is a normal engine oil indication?

A

Green (amber is cautionary)

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16
Q

How is N2 indicated on the EICAS?

A

A digital display beneath the ITT

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17
Q

What does the STOP position of the START/STOP switch do?

A

Commands the FADEC to shut down the engine provided the thrust lever is idle

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18
Q

What does the OFF position of the IGNITION selector knob do in flight? on the ground?

A

Deactivates the ignition system. FADEC disregards the OFF position in flight

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19
Q

With an SPDA failure, setting the ignition selector to OVRD energizes which igniter?

A

A

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20
Q

What controls the engine?

A
  • A two channel FADEC

- One channel is active and the other is automatic backup

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21
Q

What does FADEC stand for?

A

Full Authority Digital Electronic Control

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22
Q

What controls engine starting and provides hung start, hot start, and no light-off protection?

A

FADEC

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23
Q

Is only one FADEC channel used every flight?

A

Yes, they alternate with each engine start

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24
Q

What protections does FADEC provide on the ground?

A
  • Hot start
  • Hung start
  • No light-off
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25
Q

Is there protection for hot starts or hung starts during an inflight start?

A

No, the FADEC will initiate fuel flow if the engine does not reach 20% N2 after 15 secs

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26
Q

How are engine thrust ratings controlled?

A

FADEC

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27
Q

The FADEC has four idle modes, what are they?

A

Flight, approach, final approach and ground

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28
Q

What is flight idle?

A

minimum required thrust to provide min engine bleed to airplane and varies with altitude and other system requirements

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29
Q

What is approach idle and when is it possible?

A
  • Allow rapid acceleration to GA

- Weight off wheels, flaps not up or gear down, altitude below 15,000’

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30
Q

When is final approach idle set?

A

Same as approach idle except altitude is below 1200’. The FADEC considers anti ice OFF regardless of actual status

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31
Q

Where can the crew check engine oil?

A

on the MFD STATUS page

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32
Q

What does the oil system lubricate and cool?

A

The turbine engine main shaft bearings and the accessory gearbox

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33
Q

What does the cyan line on the N1 gauge represent during approach? When does it appear?

A

Min thrust required to meet bleed requirements below 1200’

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34
Q

What does the cyan > bug mean when displayed on the N1 EICAS indicator?

A

Target N1

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35
Q

How is the N1 limit indicated on the EICAS?

A

Its a red tick mark on the N1 indicator

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36
Q

The red line on the ITT indicates max allowable ITT. Is it indicated in flight?

A

After the T/O phase it is indicated only when the ITT does above CON thrust rating limit

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37
Q

What is ITT?

A

Interturbine temp

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38
Q

What sources are available for engine starting?

A
  • APU
  • Ground source (huffer cart or air bottle)
  • Opposite engine
  • Windmill start
39
Q

Where is external air connected to the aircraft?

A

Lower section of the fairing area

40
Q

Will the crew have any cockpit indications when external air is connected?

A

Duct pressure is shown on the STAUS page of the MFD

41
Q

What will happen if the thrust levers are positioned between the thrust control quadrant detents?

A

Selects an intermediate thrust setting

42
Q

When does the starter cut out happen?

43
Q

What is the primary and backup power source for a FADEC?

A

After 50% N2 it is powered by a permanent magnet alternator. the backup is the aircraft electrical system

44
Q

Does the FADEC provide engine start protection?

A

Only on the ground for a hot start, hung start or no light-off

45
Q

What will the FADEC automatically do in case of a hot start?

A
  • FADEC will not allow FF if ITT > 120 C

- FADEC will automatically dry motor the engine and introduce fuel when ITT

46
Q

Describe the engine start sequence

A 
Start switch momentarily to START: 
 - 7% N2
 - 20% N2 FF
 - 20% N2 + 5 secs light-off
 - 50% N2 ignition off
Engine stabilizes 2-4-6
 - N1 27%
 - ITT 460 C
 - N2 62%
 - FF 550 lbs
 - Oil pressure >25 psi
47
Q

What does WML mean on the engine indications?

A

An engine has flamed out and the FADEC has automatically turned on both igniters and is attempting an auto relight

48
Q

What provides underspend and overspeed protection

A
  • The FADEC via the FMU

- Approximately 52% and 102% N2 respectively

49
Q

Will the engine attempt to auto relight on the ground?

A

Ye but will stop when an engine rpm falls below starter cutout (50% N2)

50
Q

When will FADEC shut down an engine?

A

When N2 reaches 102% in flight and on ground

51
Q

If FADEC shuts down an engine due to overspeed protection will the FADEC command an auto relight in flight and on the ground?

52
Q

What happens after 3 overspeed detection events within 30 seconds?

A

FADEC will no relight the engine

53
Q

What heats the fuel and cools the engine oil?

A

Fuel/oil heat exchanger

54
Q

What is ATTCS and what controls it?

A
  • Automatic Takeoff Thrust Control System
  • Provides max thrust reverse (RSV) according to current rate previously selected via the MCDU on the T/O dataset page
  • FADEC controlled
55
Q

What will trigger an ATTCS event?

A
  • N1 difference > 15%
  • Engine failure during TOGA
  • Windshear detected
56
Q

What indications would you see when the ATTS has been activated?

A

The green ATTCS indication on the EICAS disappears and the cyan thrust mode will be displayed

57
Q

If the ATTCS is ON will you get RSV with an engine failure or windshear on T/O in the TOGA position?

A

Yes, always (T/O RSV or GA RSV depending)

58
Q

What is the default mode of ATTCS if no selection is made on the MCDU?

A

It defaults to ON

59
Q

Even if ATTCS is selected OFF it will be armed automatically when?

A

During go-around mode

60
Q

If the ATTCS is OFF will you get RSV with an engine failure or windshear on T/O in the TOGA position?

61
Q

Will you get RSV when selecting MAX?

A

Yes, always (T/O RSV or GA RSV depending)

62
Q

When is thrust reverse available?

A

Weight on wheels (ground use only)

63
Q

The application of max reverse thrust is not permitted below what airspeed?

64
Q

When is the thrust reverser displayed and what do the colors mean?

A
  • Whenever TR is not stowed
  • Green REV indicates deployed
  • Amber REV indicates FAIL or in transit
  • Red REV indicates discrepancy or inadvertent deployment
65
Q

What position must the thrust levers be in to engage the thrust reverser trigger?

66
Q

What provides the interlock function protect against inadvertent TR deployment and stowing?

67
Q

What happens if a TR inadvertently deploys?

A

FADEC limits respective engine thrust to IDLE

68
Q

If the thrust lever is placed in the MAX REV position and then released, it does what?

A

It is spring loaded back to the MIN REV position

69
Q

Can you deploy the TRs on an engine that has failed on the landing roll?

A

Yes, up to 30 secs following the failure, then it is locked out

70
Q

What happens to the TR within 30 secs after an engine INOP condition is detected?

A

The TR trigger cannot be released

71
Q

Where would you set the TO thrust rate mode and TO temperature?

A

The T/O DATASET MENU on the MCDU

72
Q

What engine thrust ratings may only be used for 5 mins?

A
  • TO-1
  • TO-RSV (TL beyond TOGA)
  • GA (two engine)
  • GA RSV (single engine or windshear)
73
Q

How long is go-around mode limited to in the go around phase?

74
Q

What will trigger an ATTCS event?

A
  • N1 diff >15%
  • One engine failure during TOGA
  • Windshear is detected
75
Q

What is FLEX?

A

Reduced takeoff thrust based on assumed temp (telling the FADEC that it is warmer than actual to reduce thrust)

76
Q

Where is the assumed temp displayed>

A

On the EICAS right below the ATTCS display

77
Q

How is the ATTCS system controlled?

78
Q

Can the FLEX thrust be reduced lower the CLB thrust?

79
Q

What controls the Fuel Metering Unit?

80
Q

During normal engine start the FADEC opens and closes what?

A

The FADEC opens and closes the starter control valve

81
Q

Explain in order the 4 main components of the engine? The 3 parts of the gas generator?

A

Engine: compressor, combustor, turbin, nozzle and generator
Generator: compressor, combustor, turbine

82
Q

If STOP is selected and the thrust lever is not at IDLE what would happen?

A

The engine would not shut down and you would receive an associated IDG OFF message

83
Q

If you turn the START/STOP to STOP in flight will the engine shut down?

A

Not until the thrust lever is at idle

84
Q

If you turn the ignition to OFF in flight will the engine shut down>

A

No, FADEC disregards the ignition selector OFF position in flight

85
Q

What action must be taken if the auto relight does not occur within 30 seconds?

A

The start should be manually terminated by moving START/STOP selector knob to STOP

86
Q

How does the FADEC use the 2 igniters for an engine start on the ground?

A

The FADEC alternates the ignitors at each start

87
Q

What is the only way to close the engine SOV?

A

Fire handle

88
Q

Each TR half has how many hydraulic actuators?

89
Q

What is the min bleed pressure to cross-bleed start an engine?

90
Q

What are the starter cycle limits on the ground?

A

1st and 2nd start: 90 sec on, 10 secs off

3rd to 5th start: 90 sec on, 5 mins off

91
Q

What are the EICAS engine limit display markings?

A

Red - max and min limits
Amber - caution range
Green - normal range

92
Q

How does the FADEC recognize when a combustor flameout has occurred?

A
  • N2 rate detection (rapid deceleration)
  • N2 level detection (sub idle)
  • IGNITION must be in auto mode,
93
Q

FADEC has full authority control of the:

A
  • Fuel metering unit
  • Variable geometry control
  • Operability bleed valve
  • T2 sensor heat
  • Thrust reverser actuation
  • All engine start/stop functions
  • Ignition
  • Engine limits
94
Q

What powers the FADEC?

A
  • Above 50% N2: permanent magnet alternator

- Below 50% N2: powered by aircraft electrical system

RJET E170 Study Guide 12B (16 decks)

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