Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Mesa EJET > Engine (CF34-8E5) > Flashcards

Engine (CF34-8E5) Flashcards

1
Q

Engine Type

A

General Electric CF34-8E5

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Engine Description

A

Hi-bypass, dual-rotor turbofan, 10-stage compressor with variable geometry/2-stage HP turbine

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Max Thrust

A

13,800-14,200 lbs (RSV)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Engine Lubrication System

A

Each engine, IDG and the APU have their own independent systems

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

ATS

A

Air turbine starter

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

How many igniters per engine?

A

2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

How can the engines be started?

A

APU air
Cross-bleed air (engine assist)
External air source (air cart or huffer cart)
Windmilling start (airborne only)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Engine Start Sequence

A

FADEC controlled

-For air starts FADEC ignores an “OFF” position selected on the ignition

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Normal Start Sequence

A 
N2 rotation
7% N2- Ignition 
20% N2- Fuel Flow (Light-off within 5 sec)
Normal acceleration and oil pressure
50% N2-Ignition off and starter cut-out
Normal acceleration and stabilization
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Thrust Reverser System

A
  • Hydraulically actuated
  • FADEC proved interlock protection against inadvertent deployment
  • Idle thrust commanded if opened in flight
  • Ground use only
  • Idle thrust reverse is commanded while cowls are not totally deployed
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Engine FADEC

A
  • ESS powered below 50% N2
  • PMA powered above approximately 50% N2
  • 1 installed for each engine
  • Each FADEC has 2 channels (active and standby)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

ATTCS

A

Automatic T/O Thrust Control System

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

ATTCS controlled by?

A

FADEC

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Under what conditions does the ATTCS automatically provide max engine thrust (RSV)?

A

-Armed, Thrust Levers TOGA and one of the following conditions occur

  • Difference between N1 values >15%
  • One engine failure during T/O
  • One engine failure during Go-around
  • Windshear detection
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Is ATTCS automatically armed for normal go-around mode?

A

YES

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

FLEX

A

Flexible T/O

-Reduced thrust for takeoff based on assumed temperature

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

N1

-Target

A

Cyan tick

-Max N1 for selected engine thrust

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

N1

-Rating

A

Green tick

-Max N1 allowed for current thrust rating and current operating conditions

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

N1

-Request

A

Moving Arc

-Value requested based on TLA (Thrust Lever Angle)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

TO-1

A

Takeoff

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

TO-1 RSV

A

Takeoff reserve

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

GA

A

Go-around

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

GA-RSV

A

Go-around reserve

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

CON

A

Max continuous thrust

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

CLB

A

Max climb thrust

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

CRZ

A

Max cruise

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

Idle

A

Idle

28
Q

During engine start FADEC will prevent

A
  • Hung start (inhibited in flight), compressor not accelerating to generate required airflow
  • Hot start (inhibited in flight), insufficient airflow to keep ITT under control
  • No light-off, air and fuel, but no igntion
29
Q

If N2 reaches 102% the FADEC commands?

A

Automatic shutdown

30
Q

In the event of 3 consecutive shuts downs do to overspeed within 30 seconds?

A

The FADEC will not attempt a relight

31
Q

Overtemperture

A

FADEC will prevent fuel flow during ground start until ITT is at or below 120 C

Automatic dry motoring occurs and fuel flow is commanded with ITT below 120 C

32
Q

What types of engines are on the E175?

A

General Electric CF-34-8E5

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

33
Q

How much thrust do the engines produce?

A

13,800-14,200 lbs (ISA)

34
Q

Describe N1 spool

A

Single-stage fan, 4-stage LP turbine

35
Q

Describe N2 spool

A

10-stage compressor (gas generator, 2-stage HP turbine

36
Q

How many igniters per engine?

A

2 per engine

37
Q

How many igniters activate for engine start?

A

Ground- 1 igniter (switch in AUTO)

Flight- 2 igniters (switch in AUTO)

38
Q

What happens when the ignition switch is selected to OVRD?

A

Activates both igniters on the ground or in flight

39
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

40
Q

What controls the engine?

A

2-channel FADEC (one channel active and one in standby as a backup)

41
Q

Is only one FADEC channel used every flight?

A

No, they automatically alternate with each engine start

42
Q

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

A

The minimum N1 for bleed requirements in icing conditions

Configured for landing

43
Q

What sources are available fore engine starting?

A

APU
Ground source (huffer cart or air bottle)
Opposite engine
Windmill start

44
Q

Does the FADEC provide engine start protection?

A

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

45
Q

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

A

FADEC will not allow FF if ITT >120 C

FADEC will automatically dry motor engine and introduce fuel when ITT

46
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
47
Q

Engine stabilizes

A 
N1 -- 27%
ITT -- 460 C
N2 -- 62%
FF -- 550 lbs/hr
Oil Pressure -- >25 psi
48
Q

What does WML mean on the engine indications?

A

Windmilling engine

-FADEC has detected a flame-out and is attempting an auto re-light or an assisted start has been commanded

49
Q

What provides under-speed and over-speed protection?

A

The FADEC via FMU

-Approximately 52% N2 and 102% N2 respectively

50
Q

What happens after 3 over-speed detection events?

A

FADEC will not re-light the engine

51
Q

What heats the fuel and cools engine oil?

A

Fuel / Oil heat exchanger

52
Q

What is ATTCS? What controls it?

A

Automatic Take-off Thrust Control System

  • Provides max thrust reserve (RSV) according to current rate previously selected via the MCDU
  • FADEC controlled
53
Q

What will trigger an ATTCS event?

A
  • N1 differences >15% between engines
  • Engine failure during TOGA
  • Windshear detection
54
Q

When is thrust reverse available?

A

Weight-on-wheels (WOW)

55
Q

What happens if a thrust reverser inadvertently deploys?

A

FADEC limits respective engine thrust to idle

56
Q

What engine thrust rating(s) 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)

57
Q

What is FLEX?

A

Reduced takeoff thrust based on assumed temperature (telling the FADEC that it is warmer than it actually is so it will reduce the thrust)

58
Q

Can the FLEX thrust be reduced lower than CLB thrust?

A

No

59
Q

POWER PLANT
START/STOP Selector Knob
-STOP

A

Commands FADC to shut down the engine, provided the associated thrust lever is in the IDLE position

60
Q

POWER PLANT
START/STOP Selector Knob
-RUN

A

Normal position for engine operation

61
Q

POWER PLANT
START/STOP Selector Knob
-START

A

Initiates the engine start sequence

62
Q

IGNITION Selector Knob

-OFF

A

Deactivates the ignition system on the ground when dry motoring the engine on the ground there is no fuel flow. The FADEC disregards the OFF position in flight

63
Q

IGNITION Selector Knob

-AUTO

A

FADEC automatically controls the ignition system, depending on engine requirements

64
Q

IGNITION Selector Knob

-OVRD

A

Directs FADEC to continuously activate both igniters

65
Q

N1 Spool

A

Fan (Single-stage, low pressure), driven by 4-stage low pressure turbine.

66
Q

N2 spool

A

10-stage, axial flow compressor driven by 2-stage high pressure turbine.

Mesa EJET (10 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions