Systems - Powerplant Flashcards

1
Q

What is the maximum normal takeoff thrust setting for the 700 and 900?

A

700 = 12,670lbs

900 = 13,600lbs

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2
Q

Describe the compressor and turbine section for N1

A

1 fan,

4 stage low pressure turbine

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3
Q

Describe the compressor and turbine section for N2

A

10 stage axial flow compressor, 2 stage to high pressure turbine

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4
Q

What percentage of engine air is bypass?

A

85% bypass, 15% core air

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5
Q

What is different about the first 4 stages of the N2 compressor section?

A

The first 4 stages have variable stater veins, or variable geometry system (VGVs)

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6
Q

Describe the function and actuation of the VGV’s

A

Actuated with high pressure fuel from FADEC, moves by mechanical by linkage to prevent stalls and surges

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7
Q

How is the position, of the variable geometry system, controlled?

A

FADEC changes the position of the VGV via high-pressure fuel and mechanical linkage

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8
Q

Describe the function of the operability valve

A

Provides additional compressor air flow control - extracts bleed air to offload the compressor during engine starts and high aerodynamic loading.

Programmed by FADEC and hydraulically activated by high-pressure fuel.

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9
Q

Which components are located on the accessory gearbox? (AGB)

A

3-2-1

3 pumps: hydraulic, oil, fuel.
2 sparks: IDGs & FADEC
1 ATS (Air turbine starter)

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10
Q

From which compressor stages do we receive bleed air and for what purpose?

A

6th and 10th. Used for AC, engine start, wing/cowl anti-ice and pressurization.

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11
Q

How many igniters exist in the combustion section, and what are their power sources?

A

2 AC igniter’s.

AC - A is powered by AC ESS BUS

AC - B is powered by DC BATT BUS with a static INVERTER (turning it into AC)

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12
Q

If during a battery start, ignition A is active, how will you be able to start the engine?

A

Wait 15 seconds for the “alternate” start. FADEC will control this.

Switching to ignition B stems from BATT BUS.

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13
Q

What happens when continuous ignition is selected?

A

Both ignition A and B are energized

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14
Q

When is continuous ignition required?

A

Contaminated runway, moderate or greater turbulence or rain, thunderstorms in the vicinity

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15
Q

When would FADEC automatically engage continuous ignition?

A

Close to the critical AOA, detects a disruption in airflow, or auto-relight

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16
Q

Where is the probe located that gives us inter turbine temperature information?

A

Between the high and low pressure turbines (2nd & 4th)

17
Q

When will FADEC be powered by its own alternator? When will it rely on the aircraft electrical power?

A

Below 50% N2 or failure of FADEC - it will operate off of the aircraft power.

Above 50% N2 the AGB-Mounted FADEC alternator will operate on its own.

18
Q

How many channels are on the FADEC and what if the active channel fails?

A

Two channels, one always active and one on standby to take over

19
Q

When will the active FADEC channel switch during normal ops?

A

After every start at 7% N2

20
Q

When will FADEC command a shut down of the engines?

A

Overspeed (x3) & ITT over temp on start

21
Q

True or false: the thrust levers are mechanically connected to the fuel metering unit.

A

False, they are connected by wire

22
Q

What happens if left or right FADEC fails completely?

A

The engine was shut down, flame out

23
Q

What is APR? When would FADEC command it?

A

Automatic performance reserve.

ENGINE FAILURE OR if thrust levers are in the TOGA detent.

24
Q

When will APR arm during takeoff?

A

When the N1 RPM of both engines are within 8% of schedule takeoff thrust. 

25
Q

On approach, when is APR armed for go around?

A

When the approach bit is set (either engine is available, flaps greater than 20 OR the landing gear is down)

26
Q

What would you do if the starter did not cut out automatically at 50% N2?

A

Press stop switch light, run the QRH

27
Q

When will APR be activated/deactivated by FADEC?

A

A difference of 15% N1 - cleared when fan speed mismatch becomes less than 13%

28
Q

If you receive a HOT indication/HOT-START, how would FADEC respond?

A

Abort the start and command a shut down

29
Q

Describe the normal start sequence/indications:

A
  • START illuminates with START status message
  • FADEC Applies power and ATS valve opens
  • 20% N2 and ITT less than 120
  •  thrust to idle
  • 50% N2, FADEC removes power from the starter
  • Status message removed
30
Q

During an auto-relight, what is FADEC commanding? When would FADEC discontinue an auto relight?

A

Energizes BOTH igniters.

Would discontinue below 40% N2.

31
Q

What 4 things will happen after pressing TOGA

A

TO/TO mode on ground, GA/GA select, disconnect auto pilot, update runway possession

32
Q

List the thrust of lever positions/settings logic

A

TOGA - APR
Climb – MCT
Cruise - proportional increase

33
Q

FADEC continues to calculate to N1 until it’s locked at ____ knots

A

65 knots

34
Q

True or false: FADEC is in charge of all engine operations

A

True