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Mesa ERJ E-JET 175 > Engines > Flashcards

Engines Flashcards

1
Q

What types of engines are on the ERJ 175?

A

GE CF-34-8E5

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2
Q

How much thrust do the engines produce?

A

13800-14200 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
  • 2 stage High pressure turbine
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5
Q

How many igniters per engine?

A

2

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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 igniters switch is selected to override?

A

Activates both igniters on the ground or inflight

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8
Q

Can the igniter be turned off inflight?

A

The switch may be moved to the off position but the FADEC will ignore it

(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 is in standby

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10
Q

Is only one FADEC channel used every flight?

A

No they automatically alternate with every flight

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11
Q

What does the CYAN line on the N1 gauge represent on approach?

When does it appear?

A

The minimum N1 bleed requirements in icing conditions

Configured for landing

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12
Q

What Air sources are available for starting?

A
  • APU
  • Ground source
  • Opposite engine
  • Windmill start
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13
Q

Does the FADEC provide engine start protection

A

Only on the ground for:

  • HOT START
  • HUNG START
  • 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
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16
Q

Engine Stabilizes at?

A
  • N1………………….27%
  • ITT…………………460c
  • N2 ………………..62%
  • Fuel Flow………550 pph
  • Oil pressure…. > 25 PSI
17
Q

What does WML mean on the engine indications

A

Windmilling engine

The FADEC has detected a flame out and is attempting to auto-relight or The assisted start has been commanded

18
Q

What provides the underspeed and overspeed 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 engines
  • Engine failure during TOGA
  • Windshear detected
23
Q

When is thrust reverse available?

A

Weight on wheels (WOW)

24
Q

What happens if a thrust reverser inadvertently deploys?

A

FADEC limits respective engine thrust to idle

25
Q

What engine thrust ratings may only be used for 10 minutes?

A
  • TO-1
  • TO-RSV (TL beyond TOGA)
  • GA (two engine go around)
  • GA-RSV (one engine go-around or windshear)
26
Q

What is FLEX

A

Reduced thrust takeoff based on assumed temperature

(telling FADEC that it is warmer than it actually is so it will reduce thrust)

27
Q

Can the FLEX thrust be reduced lower than CLB thrust

A

No

28
Q

Minimum N2

A

58.50%

29
Q

Maximum N2

A

99.40%

30
Q

Maximum N1

A

99.50%

31
Q

Maximum N1 w/breaks applied

A

60%

32
Q

Starter Duty Cycle

A

On the ground: Attempts 1 & 2: 90 seconds on / 10 seconds off

Attempts 3 - 5: 90 seconds on / 5 minutes off

Inflight: 120 seconds on / 10 seconds of

120 seconds on / 5 minutes off

33
Q

Maximum ITT Start Tempurature

A

815c

34
Q

Maximum Continuous ITT

A

960c

35
Q

Maximum T/O & G/A Tempurature

A

990c (10 minutes)

1006c (first 2 minutes)

36
Q

Minimum Oil Pressure

A

25 psi

37
Q

Maximum Oil Pressure

A

95 psi

38
Q

Maximum Transient Oil Temperature

A

163c (for 15 minutes)

39
Q

Maximum Continuous Oil Tempurature

A

155c

Mesa ERJ E-JET 175 (27 decks)

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