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Engine (CF34-8E5) Flashcards

1
Q

Engine Type

A

General Electric CF34-8E5

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2
Q

Engine Description

A

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

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3
Q

Max Thrust

A

13,800-14,200 lbs (RSV)

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4
Q

Engine Lubrication System

A

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

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5
Q

ATS

A

Air turbine starter

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6
Q

How many igniters per engine?

A

2

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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)

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8
Q

Engine Start Sequence

A

FADEC controlled

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

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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
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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
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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)
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12
Q

ATTCS

A

Automatic T/O Thrust Control System

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13
Q

ATTCS controlled by?

A

FADEC

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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
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15
Q

Is ATTCS automatically armed for normal go-around mode?

A

YES

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16
Q

FLEX

A

Flexible T/O

-Reduced thrust for takeoff based on assumed temperature

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17
Q

N1

-Target

A

Cyan tick

-Max N1 for selected engine thrust

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18
Q

N1

-Rating

A

Green tick

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

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19
Q

N1

-Request

A

Moving Arc

-Value requested based on TLA (Thrust Lever Angle)

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20
Q

TO-1

A

Takeoff

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21
Q

TO-1 RSV

A

Takeoff reserve

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22
Q

GA

A

Go-around

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23
Q

GA-RSV

A

Go-around reserve

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24
Q

CON

A

Max continuous thrust

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25
CLB
Max climb thrust
26
CRZ
Max cruise
27
Idle
Idle
28
During engine start FADEC will prevent
- 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
If N2 reaches 102% the FADEC commands?
Automatic shutdown
30
In the event of 3 consecutive shuts downs do to overspeed within 30 seconds?
The FADEC will not attempt a relight
31
Overtemperture
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
What types of engines are on the E175?
General Electric CF-34-8E5 | -Hi-bypass, 2-spool, axial-flow, turbo-fan
33
How much thrust do the engines produce?
13,800-14,200 lbs (ISA)
34
Describe N1 spool
Single-stage fan, 4-stage LP turbine
35
Describe N2 spool
10-stage compressor (gas generator, 2-stage HP turbine
36
How many igniters per engine?
2 per engine
37
How many igniters activate for engine start?
Ground- 1 igniter (switch in AUTO) Flight- 2 igniters (switch in AUTO)
38
What happens when the ignition switch is selected to OVRD?
Activates both igniters on the ground or in flight
39
Can the igniters be turned off during flight?
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
What controls the engine?
2-channel FADEC (one channel active and one in standby as a backup)
41
Is only one FADEC channel used every flight?
No, they automatically alternate with each engine start
42
What does the cyan line on the N1 gauge represent during approach? When does it appear
The minimum N1 for bleed requirements in icing conditions | Configured for landing
43
What sources are available fore engine starting?
APU Ground source (huffer cart or air bottle) Opposite engine Windmill start
44
Does the FADEC provide engine start protection?
Only on the ground for hot start, hung start or no light-off
45
What will the FADEC automatically do in case of a start on the ground?
FADEC will not allow FF if ITT >120 C | FADEC will automatically dry motor engine and introduce fuel when ITT
46
Describe the engine start sequence
``` Start switch momentarily to start: 7% N2 -- Ignition 20% N2 -- Fuel flow 20% N2+ 5 sec -- Light off 50% N2 -- Ignition off ```
47
Engine stabilizes
``` N1 -- 27% ITT -- 460 C N2 -- 62% FF -- 550 lbs/hr Oil Pressure -- >25 psi ```
48
What does WML mean on the engine indications?
Windmilling engine | -FADEC has detected a flame-out and is attempting an auto re-light or an assisted start has been commanded
49
What provides under-speed and over-speed protection?
The FADEC via FMU | -Approximately 52% N2 and 102% N2 respectively
50
What happens after 3 over-speed detection events?
FADEC will not re-light the engine
51
What heats the fuel and cools engine oil?
Fuel / Oil heat exchanger
52
What is ATTCS? What controls it?
Automatic Take-off Thrust Control System - Provides max thrust reserve (RSV) according to current rate previously selected via the MCDU - FADEC controlled
53
What will trigger an ATTCS event?
- N1 differences >15% between engines - Engine failure during TOGA - Windshear detection
54
When is thrust reverse available?
Weight-on-wheels (WOW)
55
What happens if a thrust reverser inadvertently deploys?
FADEC limits respective engine thrust to idle
56
What engine thrust rating(s) may only be used for 10 minutes.
TO-1 TO-RSV (TL beyond TOGA) GA (two engine go-around) GA-RSV (one engine go-around or windshear)
57
What is FLEX?
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
Can the FLEX thrust be reduced lower than CLB thrust?
No
59
POWER PLANT START/STOP Selector Knob -STOP
Commands FADC to shut down the engine, provided the associated thrust lever is in the IDLE position
60
POWER PLANT START/STOP Selector Knob -RUN
Normal position for engine operation
61
POWER PLANT START/STOP Selector Knob -START
Initiates the engine start sequence
62
IGNITION Selector Knob | -OFF
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
IGNITION Selector Knob | -AUTO
FADEC automatically controls the ignition system, depending on engine requirements
64
IGNITION Selector Knob | -OVRD
Directs FADEC to continuously activate both igniters
65
N1 Spool
Fan (Single-stage, low pressure), driven by 4-stage low pressure turbine.
66
N2 spool
10-stage, axial flow compressor driven by 2-stage high pressure turbine.

Mesa EJET (10 decks)

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