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Systems COPY COPY > Engine > Flashcards

Engine Flashcards

1
Q

What type of engines does the emb-145 have?

A 
Rolls-Royce AE3007A1
High bypass ratio (5-1)
Two spool
Axial flow
Turbo fan engine
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2
Q

What are the components of the engine?

A 
24 blade fan
14 stage compressor 5 variable pitc
2 stage high pressure turbine, compressor
3 stage low pressure turbine, fan
Accessory gear box
Forced air mixer
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3
Q

How many FADEC’s are there and where are they located?

A

2 per engine A and B

Located in the forward electronics compartment.

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4
Q

What is in the compressor section of the engine?

A

A 14 stage axial flow compressor

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5
Q

What parts of the compressor are moveable?

A

The inlet guide vane and the first five stages of the compressor. (Compressor Variable Geometry)

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6
Q

What is the fan connected to and how?

A

The 3 stage low pressure turbine

By an inside shaft.

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7
Q

How is the compressor driven?

A

By the 2 stage high pressure spool

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8
Q

How is the accessory gear box driven?

A

By a tower shaft driven by the 2 stage high pressure spool.

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9
Q

What does ground idle ensure for the airplane?

A

Avoid flame out, overheat, and inability to accelerate
Adequate bleed flow and temperature for ECS
Adequate generator speed

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10
Q

What does flight idle ensure?

A

Ground idle +
Anti icing
Go around in 8 seconds

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11
Q

Where is bleed air taken from? Why?

A

9th low pressure
10th internal cooling
14th high pressure

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12
Q

When does the 14th stage open?

A

Low thrust
Engine starts
Anti ice

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13
Q

What is in the accessory gear box?

A 
Fuel pump metering unit
2 generators
Hydraulic pump
Oil pump
Air turbine starter
Permanent magnetic starter
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14
Q

How many fuel nozzles and igniter plugs are there?

A

16 fuel

2 igniters

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15
Q

What are the fuel system components?

A 
Fuel pump metering unit
(Engine and centrifugal pump)
Fuel cooled oil cooler
Compressor variable geometry
Fuel flow meter
Fuel nozzles
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16
Q

What is the primary and secondary functions of the fuel system?

A

Filter and meter fuel for combustion

CVG
FCOC

17
Q

What does the oil system consist of?

A 
12qt tank
Pressure pump 
Oil filter
ACOC
FCOC
sump and bearings
18
Q

What does the air oil separator do?

A

Removed foam generated by air seals and vents it out the top of the tank.

19
Q

When does oil bypass the FCOC?

A

When fuel temp is over 93.3 C

Differential pressure is over 50psi

20
Q

What are the components of the ignition system?

A

2 igniters powered by PMA 10%

FADEC commands ignition at 14%

21
Q

What power the FADEC’s?

A

Essential DC 1 and 2

Until 50% N2 then PMA

22
Q

Which FADEC controls which igniter?

A

FADEC A controls igniter A

FADEC B controls igniter B

23
Q

How is the Starter Control Valve operated?

A

Electrically by the starter.

24
Q

What are the sources of air for an engine start?

A

Cross bleed
APU
Ground air

25
Q

What is the engine start sequence?

A 
0% FADEC powered, signals igniter
10% PMA Powers igniter
14% FADEC commands ignition
28% FADEC commands fuel
50% FADEC powered by PMA
53% ATS valve closes
56.4% starter cuts out 
56.7% FADEC successful start
26
Q

How do the thrust reverser doors open?

A

Hydraulic actuator pivoting the doors open.

27
Q

How many locks are on the thrust reverser?

A

3
Primary - holds load
Secondary - unloaded
Tertiary - unloaded

28
Q

How are the primary and secondary lock controlled and actuated?

A

Electrically controlled

Hydraulically actuated

29
Q

How is the tertiary lock controlled?

A

Electrically controlled

Electrically actuated

30
Q

When will the thrust reversers deploy?

A

Main gear WOW +25kts

Main and nose gear WOW

31
Q

How is control transferred from one FADEC to the other?

A

Automatically on each start or a fault is detected

Manually by the selector knob

32
Q

When will the FADEC’s command T/O 1 mode?

A 
T/O 1 mode selected 
T/O 1 button pressed
Thrust levers beyond detent
Landing gear down below 15,000'
Engine disagree 
Power interruption.
33
Q

When will the FADEC’s allow CON mode?

A

Above 300’ and gear up

Above 1700’

34
Q

When can CLIMB and CRUISE mode be selected?

A

Above 500’ gear up

Above 1700’

35
Q

What triggers ATTCS?

A

TLA opposite engine below 38
Either FADEC receives inop signal
Doesn’t arm or disarm in 2 seconds

36
Q

What are the FADEC discrete outputs?

A

N2 speed each engine

Environmental control system off

37
Q

What happens when n1 is lost?

A

N1 is derived from the corresponding N2

38
Q

What powers the FADEC’s potentiometers?

A

FADEC

39
Q

What are the different sections of the engine.

A 
Fan
Compressor 
Combustion
Turbine
Exhaust

Systems COPY COPY (23 decks)

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