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ERJ7 > EMB7 Engines > Flashcards

EMB7 Engines Flashcards

1
Q

What controls engines?

A

Dual channel FADEC system

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2
Q

Describe how fuel gets to engines.

A

From collector tanks to engine fuel pumps. Splits into 2 streams

High pressure pump back to tanks to supply motive flow

Low pressure pump to heat exchanger to fuel filter, back to high pressure pump then to FMU (fuel metering unit) then to fuel injectors

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3
Q

What does the Oil system lubricate and cool?

A

Turbine engine main shaft bearings and accessory gear box

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4
Q

Where is oil quantity info displayed?

A

MFD

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5
Q

What does the starter system include?

A

ATS ( air turbine starter) 
SCV ( starter control valve) controlled by FADEC

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6
Q

Describe start sequence on ground.

A

FADEC opens SCV to allow pneumatic system to provide air to the ATS. FADEC initiates ignition at 7% N2 and fuel flow starts at 20% n2 provided ITT is 120° c or less

After lightoff , starter cutout at 50%n2 and commands FMU TO accelerate to ground idle

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7
Q

Ignition system

How many systems for start are energized?

Ground?

Flight?

A

1 on ground

2 in flight

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8
Q

What does ignition override do?

A

Both igniters on each engine are energized

Will cause sig reduction in igniter life if used frequently

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9
Q

Describe in flight cross bleed start.

A

Identical to ground start except FMU opens to provide fuel after 15 seconds even if 20% n2 is not reached

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10
Q

Describe windmilling start

A

Commanded by start stop switch 
Ignition at 7 % n2 
Fuel flow at 7.2% N2 or 15 seconds whichever occurs first

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11
Q

Does FADEC provide protection for hot starts/ hung or failure to light off?

A

On ground yes. If no lightoff in 15 seconds after fuel flow it switches ignitions

In flight- no

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12
Q

When do you abort the engine start?

A

If no lightoff within 30 sec of fuel flow

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13
Q

Describe auto relight

A

FADEC monitors n2 and turns on both igniters and schedules relight fuel flow in event if flameout

WML icon will show next to respective engine n2 on EICAS

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14
Q

Inflight If engine does not relight automatically within 30 sec or n2 falls below 7.2% you should-

A

Consider it a failed attempt and you should terminate it manually by moving start stop switch to stop position

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15
Q

Auto relight on ground is terminated and fuel flow is shutoff if….

A

N2 falls below 52%.

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16
Q

The Thrust reversers are actuated and controlled by…

A

Actuated - Hydraulically

Controlled - Thrust lever

17
Q

What prevents inadvertent thrust reverser deployment and stowing?

A

An interlock controlled by FADEC 
Consisting of 2 actuator locks and an independent cowl lock

18
Q

Describe thrust reverser deployment

A

On ground move thrust levers to idle rev thrust 
Once both cowls are deployed you can command Max rev thrust by holding thrust levers in Max rev

19
Q

What happens if one reverser fails while in Max rev?

A

Operating reverser will provide only min rev thrust unless you select just the operating thrust lever to Max rev

20
Q

If thrust reverser actuates in flight what happens?

A

Engine thrust is limited to idle thrust

21
Q

Engine control system consists of…

A

FADEC 
Thrust levers 
T2 
N1 sensors

22
Q

What does the thrust lever do?

A

Receives input of desired thrust setting from pilot or auto throttles

23
Q

What does T2 do?

A

Monitors engine inlet air temp for FADEC control calculations

24
Q

What does the n1 sensor do?

A

Provides fan speed info for FADEC and airplane vibration monitoring system

25
Q

Describe FADEC

A

Main component of engine system 
It provides 
Engine protection 
Control of requested and Max N1 
Control of ATTCS

FADEC has 2 identical independent channels one is the in control 
Channel the other is always in standby in case of active channel failure

The channels switch control on every start

26
Q

Where does FADEC get it’s electrical power?

A

Below 50% n2 from the airplanes electrical system

Above 50% n2 from the PMA ( permanent magnet alternator)

27
Q

Describe the ATTCS

A

Automatic takeoff thrust control system, 
Controlled by FADEC and is available on t/o and go around

It will provide RSV Power in event of engine failure

Displayed on EICAS as white - armed

And green - engaged. ( only when thrust levers are in TOGA

28
Q

When will RSV POWER BE ACTIVATED?

A

ATTCS must be engaged 
And if one of the following occurs

N1 difference greater than 15% 
One engine fails during takeoff 
One engine fails during go around 
Windshear detected

Max thrust commanded by thrust levers

29
Q

What is minimum flex thrust for takeoff?

A

75% of Max rated takeoff thrust or 
Climb -2 + .5 %n1 whichever is higher

30
Q

What are the different idle modes?

A

Flight idle 
Approach idle 
Final approach idle 
Ground idle

31
Q

When is approach idle activated?

A

Alt less than 15000’ 
In flight 
Flaps 1 or greater 
Gear down

32
Q

When is final approach idle active?

A

Alt lower than 1200 agl 
Landing flaps set 
Gear down

33
Q

Describe n2 over speed protection?

A

Whenever n2 reaches 102% FADEC commands an engine shutdown 
In the event of 3 consecutive over speed indications within 30 sec FADEC will not relight the engine

34
Q

If FADEC aborts the start due to a high ITT what do you need to do?

A

Close the SCV by putting the start stop switch to stop

35
Q

How much oil does each engine hold?

A
  1. 5 quarts

7. 2 usable

36
Q

How much oil does APU hold?

A

4.54 quarts

37
Q

What type of engines?

A

General Electric

CF34- 8E5 
High bypass dual rotor turbofan

38
Q

When will APU auto shutdown 
In flight

A

U. UNDERSPEED 
F. FADEC FAULT 
O. OVERSPEED

39
Q

When will APU auto shutdown on ground

A

U. UNDERSPEED 
F. FADEC FAULT 
O. OVERSPEED 
S. SENSOR FAILURE 
H. HI OIL TEMP 
E. EGT OVERTEMP 
L. LOW OIL PRESSURE 
F. FIRE

ERJ7 (14 decks)

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