Engine Questions Flashcards

1
Q

What type of engines are on the aircraft?

A
  • Two General Electric CF-34-8E5

- Hi bypass, 2 spool, axial-flow, turbo fan

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2
Q

How much thrust do the engines produce?

A
  • 13,800 - 14,200 lbs (ISA)
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3
Q

Describe N1 spool?

A
  • Single-stage fan

- 4 stage LP turbine

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4
Q

Describe N2 spool?

A
  • 10 stage compressor (gas generator)

- 2 stage HP turbine

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5
Q

How many igniters per engine?

A
  • 2 per engine
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6
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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7
Q

What happens when the ignition switch is selected to OVRD?

A
  • Activates both igniters on the ground or in flight
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8
Q

Can the igniters be turned off during 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
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9
Q

What controls the engine?

A
  • A two-channel FADEC

- One channel is active and the other channel remains in standby as a backup

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10
Q

Is only one FADEC channel used every flight?

A
  • No. They automatically alternate with each engine start
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11
Q

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

A
  • The minimum N1 for bleed requirement in icing conditions

- Configured for landing < 1200 RA (when anti-ice is ON)

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12
Q

What sources are available for engine starting?

A
  • APU
  • Ground source (suffer cart or air bottle)
  • Opposite engine
  • Windmill start
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13
Q

Does FADEC provide engine start protection?

A
  • Only on the ground for a hot start, hung start or no light off
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14
Q

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

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

- FADEC will automatically dry motor engine and introduce fuel when ITT < 120c

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15
Q

Describe the engine start sequence?

A
  • Start switch momentarily to start
  • 7% N2 ignition
  • 20% N2 fuel flow
  • 20%N2 + 5 sec Light off
  • 50% N2 ignition off
  • 50% N2 starter cutout
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16
Q

Engine stabilizes?

A
  • N1 27%
  • ITT 460c
  • N2 62%
  • FF 550lbs/hr
  • Oil Pressure >25psi
17
Q

What does WML mean on the engine indications?

A
  • Windmilling engine
  • The FADEC has detected a flame-out and is attempting an auto re-light, or
  • An assisted start has been commanded
18
Q

What provides under speed and over speed protection

A
  • The FADEC via the FMU

- Approximately 52% N2 and 102% N2 respectively

19
Q

What happens after 3 overspeed detection events?

A
  • FADEC will not relight the engine
20
Q

What heats the fuel and cools the engine oil?

A
  • Fuel/oil heat exchanger
21
Q

What is ATTCS? What controls it?

A
  • Automatic takeoff thrust control system
  • Provides max thrust reserve (RSV) according to current rate previously selected via the MCDU
  • FADEC controlled
22
Q

What will trigger an ATTCS event?

A
  • N1 difference > 15% between engine
  • Engine failure during TOGA
  • Windshear detected
23
Q

When is thrust reverse available?

A

Weight-on-wheels (ground use only)

24
Q

What happens if a thrust reverser inadvertently deploys?

A
  • FADEC limits respective engine thrust to IDLE
25
What engine thrust ratings may only be used for 10 min?
- TO-1 - TO-RSV (TL beyond TOGA) - GA (two-engine go-around) - GA-RSV (one engine go around or wind shear)
26
What is FLEX?
- Reduced takeoff thrust based on assumed temperature(telling the FADEC that it is armer than it actually is so it will reduce the thrust)
27
Can the FLEX thrust be reduced lower than CLB thrust?
- No