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Embraer 190 Technical > Engines > Flashcards

Engines Flashcards

1
Q

What are the components of the Engine Fuel System?

A

Fuel Pump
Fuel/Oil Heat Exchanger
Fuel Metering Unit
Fuel Filter
Variable Stator Vanes
Fuel Injectors

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2
Q

What does the Fuel/Oil Heat Exchanger do?

A

Maintains the Engine Oil Temperature within an acceptable range and heats the engine fuel to prevent freezing

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3
Q

What does the Fuel Metering Unit do?

A

Meters and distributes correct amount of fuel for combustion to the injectors
AND
Controls the Shutoff Valve during normal shutdown
AND
Provides Overspeed Protection

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4
Q

What controls the Fuel Metering Unit?

A

FADEC

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5
Q

What is the purpose of the fuel filter?

A

To remove contaminants from the fuel

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6
Q

What controls the Variable Stator Vanes

A

FADEC (via the FMU)

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7
Q

What do the Fuel Injectors do?

A

Atomise the fuel from the FMU and direct it into the combustion chamber

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8
Q

How many ignitors are energised IN FLIGHT?

A

2

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9
Q

How many Ignitors are energised ON GROUND?

A

1

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10
Q

What does the ignition system do and how many ignitors are there?

A

Provides an electrical spark for fuel combustion
2 Ignitors

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11
Q

What are the 5 Engine Protections?

A

Hung Start
Hot Start
No Light Off
Overspeed
Overtemperature

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12
Q

When are Hung Start, Hot Start & No Light Protections NOT available?

A

IN FLIGHT (For In flight Starts)

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13
Q

In the event of an Overspeed, when will the FADEC Automatically command engine shutdown?

A

N2 102%

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14
Q

In the event of an Overspeed, after how many detections will the FADEC not relight the engine?

A

3 consecutive Overspeeds within 30 seconds

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15
Q

What controls the ITT limits?

A

FADEC, varying them according to phase of operation

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16
Q

In the event of Overtemperature during Engine Start when will the FADEC prevent fuel flow?

A

Temperature above 120°C

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17
Q

What happens if the ITT reaches its Temperature limit during Engine Start?

A

The FADEC automatically shuts off the fuel flow, aborting the start sequence

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18
Q

In the event the ITT reaches its temperature limit during Engine Start and the FADEC has automatically shut off the fuel flow flow, what must the pilots do?

A

Turn the START/STOP switch to STOP as the start control valve is NOT automatically closed

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19
Q

What is ATTCS?

A

Automatic Takeoff Thrust Control System

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20
Q

What controls ATTCS?

A

FADEC

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21
Q

When is ATTCS available?

A

Take off & Go Around

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22
Q

What does ATTCS do?

A

Command RSV (max engine thrust reserve) according to the Take off thrust rating/mode set

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23
Q

What is the default ATTCS Setting?

A

ON

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24
Q

Where are ATTCS Selections made?

A

MCDU - TAKEOFF DATA SET MENU

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25
How will you know that ATTCS is ARMED?
ATTCS in WHITE
26
How will you know that ATTCS is ENGAGED?
ATTCS in GREEN (when thrust levers reach the TO/GA position)
27
When is ATTCS AUTOMATICALLY activated? (per ATTCS Logic)
ATTCs automatically commands RSV when: ATTCS ENGAGED Thrust Levers at TO/GA position AND one of: 1 Engine Failed on Take off or Go Around Windshear Detection Difference Between both Engine N1 Values is greater than 15%
28
When is ATTCS ARMED during a Go Around?
Whenever the Thrust Rate mode is GA
29
How can ATTCS be MANUALLY activated?
By moving the thrust levers to MAX whenever ATTCS is engaged
30
How do you know that ATTCS is activated?
GREEN EICAS ATTCS removed Cyan Thrust Mode is displayed with RSV
31
When will you receive RSV in the event of Windshear?
Whenever the thrust levers are set to MAX, even if ATTCS is OFF
32
What is FLEX?
Reduced take off thrust based on assumed temperature
33
Where can the Assumed Temperature for FLEX be set?
MCDU TAKEOFF DATA SET MENU| Assumed temp must be HIGHER than the Takeoff Temperature
34
What Thrust Modes/Ratings are eligible for FLEX?
All Takeoff Modes/Ratings TO-1, TO-2, TO-3
35
Should ATTCS be ON or OFF for a FLEX Takeoff?
Can be either
36
What is the minimum FLEX takeoff thrust?
75% Max Rated Take Off Thrust OR CLB-2 + 1% Whichever is Higher
37
What are Engine Thrust Ratings?
Calculated Max N1 for each Engine Thrust Rating adjusted for Altitude, Temp & Airspeed
38
What are the Engine Thrust Ratings?
TAKEOFF MAX TAKEOFF RSV GO AROUND GO AROUND RSV MAX CONTINUOUS MAX CLIMB RATING MAX CRUISE RATING IDLE
39
How many Take off Thrust Ratings are there?
3 - used for normal take off TO-1 TO-2 TO-3
40
When is the calculated N1 achieved for the Takeoff Thrust Ratings?
When the thrust levers are in the TO/GA position
41
When is GA-RSV used?
Extreme situations where extra thrust is required (Highest engine thrust possible)
42
When is Max CON Thrust Rating Used?
In an emergency where higher thrust than usual is required
43
When is TO-RSV Thrust Rating used?
Whenever ATTCS is triggered, and its conditions met
44
When is GA Thrust Rating activated?
Landing Gear & Flaps are down (Can also be achieved when in any other Thrust Rating Mode and the thrust levers are set to TO/GA)
45
How many Idle Thrust Ratings are there?
4 FLIGHT IDLE APPROACH IDLE FINAL APPROACH IDLE GROUND IDLE
46
When is Approach Idle Thrust Rating activated?
IN FLIGHT Altitude less than 15,000ft Flaps 1+ or Landing Gear Down
47
When is Final Approach Idle Thrust Rating activated?
Altitude less than 1200ft AGL Landing Flaps Set (5 or FULL) Landing Gear Down
48
What is the default Climb Thrust Rating?
CLB-1
49
When is CLB-2 default selected?
When the Takeoff thrust is lower than CLB-1
50
What happens to the Idle Thrust Rating Calculated Max N1 when Ice is detected?
Flight & Approach Idle - N1 Automatically increased to maintain the minimum bleed pressure required for operation of the anti-ice system Final Approach Idle - NO N1 Increase
51
What happens to the Final Approach Idle Thrust Rating Calculated Max N1 when Ice is detected?
No increase Cyan Dash is displayed on the EICAS N1 dials to show the minimum thrust required to maintain the bleed pressure required for operation of the anti-ice system
52
What does a CYAN line/dash mean on the edge of the N1 indicator?
Displayed in icing conditions during FINAL APPROACH to indicate the MIN thrust (N1) to meet bleed requirements
53
What does a Cyan V Bug indicate on the N1 gauge?
N1 Target
54
How is the Engine FADEC normally powered?
Above 50% N2 - PMA (Permanent Magnet Alternator) Below 50% N2 or if PMA inop - Aircraft Electrical System
55
When does the ITT Red line change to AMBER?
After the end of the takeoff phase
56
What does the ITT Red Line mean?
ITT Temperature Limit
57
What are the components of the Engine Control System?
FADEC Thrust Levers T2 Sensor N1 Sensor
58
What controls the Variable Geometry Valves to improve N1 efficiency?
FADEC
59
How many Channels does the Engine FADEC have?
2 ACTIVE/STANDBY (active alternates every engine start)
60
What does the T2 sensor do?
Monitor Engine INLET air temperature
61
What does the N1 Sensor do?
Provides Fan Speed data & monitors aircraft vibration
62
What are the key elements of the Start & Ignition Process on ground?
7% N2 - FADEC initiates ignition 20% N2 - Fuel Flow Introduced (Metering Valve Opens) 50% N2 - when Light off occurs > Ignition OFF and FMU accelerates engine to ground idle speed
63
During Engine Start, what happens if No Light Off is detected within 15 seconds of Fuel ON?
FADEC automatically turns off ignition and fuel, and continues dry motoring for 30 seconds, tries single ignition and fuel ON again
64
During Engine Start, what happens if No Light Off is detected after 30 seconds of Dry motoring and a further single ignition/fuel ON attempt?
After 7 seconds, FADEC commands DUAL ignition for 8 seconds If no LIGHT OFF is detected after 15s of the reintroduction of fuel or after start duty limit is reached (whichever occurs first), the FADEC does not turn off fuel or ignition automatically . Need to manually abort.
65
During an Auto Relight in Flight what indications would you expect to see next to the N2 indication?
A WML icon
66
How many ignitors are energised during an auto relight?
2
67
When is an Auto Relight considered unsuccessful?
If the engine does not relight within 30seconds or if the N2 falls below 7.2%
68
How can an engine be restarted in flight?
Engine Crossbleed Air APU Bleed Air Windmilling
69
What are the steps for Windmilling Engine Start in Flight?
7% N2 - FADEC initiates ignition 7.2% N2 OR after 15 seconds (whichever comes first) - Fuel Flow Introduced (Metering Valve Opens)
70
What are the key elements of the Start & Ignition Process IN FLIGHT?
7% N2 - FADEC initiates ignition 20% N2 - Fuel Flow Introduced (Metering Valve Opens) > Fuel Flow automatically introduced if N2 has not reached 15% after 15 seconds 50% N2 - when Light off occurs > Ignition OFF and FMU accelerates engine to ground idle speed
71
When are BOTH ignitors energised?
Engine Start IN FLIGHT Engine Air Start Engine Flameout Missed Light Off Cold Soak Condition on GROUND Ground Starts at HIGH altitude Ignition Selector Knob in the OVRD position
72
What are ignitors 1 & 2 connected to?
SPDA 2
73
What happens to the ignitors if SPDA 2 Fails?
Setting the selector knob to OVRD will energise at least ignitor A
74
What happens if the ITT limit is exceeded during an in-flight start?
FADEC interrupts the fuel flow for 4 seconds and then resumes the start (This can be repeated 8 times until the logic is no longer available) Pilots must still monitor engine parameters and manually abort the start where necessary
75
What does the Starter Control Valve do?
Provides Bleed Air from the APU, other Ground Source or Opposite Engine
76
When does the Starter Control Valve Close?
When the starter cut out speed is reached
77
What are the components of the Starting System?
Air Turbine Starter (ATS) Starter Control Valve (SCV)
78
What is the ATS (Air Turbine Starter)?
A turbine that accelerates the engine to a self sustaining RPM level - supplied by Bleed Air from the Pneumatic System
79
What are the components of the Engine Lubrication System?
1 x Oil Tank 1 x Oil Pump 1 x Oil Filter PER ENGINE
80
What does the Engine Lubrication system do?
Lubricates and cools the engine shaft bearings and accessory gearbox
81
What is the normal range for Engine Vibration?
0-3.9
82
What is the cautionary operating range for engine vibration?
4-5
83
What kind of Engine does the Embraer 190 have?
General Electric CF34-10E
84
Max Thrust of the Engine?
18500lb
85
What type of engines do the Embraer 190 have?
High Bypass, Dual Rotor Turbofans, 4 stage low pressure turbine, 9 stage axial flow compressor
86
What are the N1 & N2 Rotors?
N1 - Fan N2 - Compressor
87
Where are the thermocouples and how many are there?
5 Located int he inlet stream of the low pressure turbine
88
What is the purpose of the Variable Stator Vanes?
Optimise the Position of the Compressor stators as a function of corrected N2 to provide optimum compressor efficiency
89
How many thrust reversers are there?
2
90
How are the Thrust Levers Locked?
2 Actuator Locks 1 Independent Cowl Lock (to prevent inadvertent deployment)
91
How are the thrust reversers actuated?
Hydraulically
92
What happens if 1 thrust reverser fails with MAX REV selected on both engines?
Operative Thrust Reverser provides minimum reverse thrust only BUT Selecting ONLY the operative Thrust Reverser to MAX REV enables max thrust on this engine - both thrust levers will need to have been moved to IDLE to reset the system to do so
93
What does an AMBER REV displayed below the N1 indication dial represent?
The Reverse Cowl is in Transition
94
What are the 2 Reverse Thrust Settings?
Min REV & MAX Rev
95
How is Max Thrust Commanded?
By holding the levers in the MAX REV position, letting go will revert them to MIN REV
96

Embraer 190 Technical (20 decks)

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