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Embraer 190 Technical > APU > Flashcards

APU Flashcards

1
Q

What controls & monitors the APU?

A

A dedicated FADEC

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2
Q

APU Protection: When will the FADEC automatically shutdown the APU in flight?

A

Overspeed
Underspeed
FADEC Critical Fault

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3
Q

APU Protection: When will the FADEC automatically shutdown the APU on the ground?

A

Overspeed
Underspeed
FADEC Critical Fault
APU Fire
APU EGT Over Temperature
APU Low Oil Pressure
APU High Oil Temperature
Sensor Fail

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4
Q

How would you carry out a normal APU Shutdown?

A

APU Master Selector knob from ON > OFF

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5
Q

What happens if you move the Master Selector Knob from OFF > ON during the shutdown sequence?

A

Cancels the Shutdown

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6
Q

How would you shutdown the APU in an Emergency?

A

Push the APU EMER STOP Button

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7
Q

What happens when the APU EMER STOP Button is pushed?

A

APU Fuel Shutoff Valve Closes
APU Shuts down with NO cooldown period
WHITE Striped Bar illuminates on the lower half of the APU EMER STOP Button

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8
Q

When would the upper half of the APU EMER STOP Button illuminate RED?

A

When an APU Fire is detected

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9
Q

How long is it recommended to wait after the EICAS is energised to attempt a start of the APU?

A

30 seconds

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10
Q

Which Fuel Tank provides fuel to the APU?

A

Right Wing Tank

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11
Q

Is it possible to provide fuel to the APU from the Left Wing Tank?

A

Yes, via the Crossfeed Valve

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12
Q

When only DC Power is available, which pump provides Fuel to the APU?

A

DC Fuel Pump
(located in the Right Wing Tank)

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13
Q

If AC Power is available (GPU) but the engine is not running, which pump provides Fuel to the APU?

A

AC Fuel Pump
(located in the Right Wing Tank)

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14
Q

If the engines are running, which pump provides Fuel to the APU?

A

The RIGHT Ejector Pump

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15
Q

What are the steps to start the APU?

A

APU Master Selector Knob from OFF > ON
APU Master Selector Knob from ON > START (Momentary Action)

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16
Q

During APU Start, what happens when you move the APU Master Selector Knob from OFF > ON?

A

Powers up the FADEC
APU Fuel Shutoff Valve Opens
EICAS Indications change from OFF to APU EGT & Rotor Speed

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17
Q

What is the Max APU Continuous EGT?

A

717°C

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18
Q

What is the Max APU Start EGT?

A

1032°C

19
Q

What is the Max APU Rotor Speed?

A

108%

20
Q

What is the Max Altitude at which you can start the APU?

A

30,000ft

21
Q

What is the Minimum Temperature at which you can start the APU?

A

-54°C

22
Q

What is the Max Operating Altitude of the APU?

A

33,000ft

23
Q

What is the Max Altitude for APU Electrical Generation?

A

33,000ft

24
Q

What is the Max Altitude for APU Bleed Air to assist Engine Start?

A

21,000ft

25
Q

What is the Max Altitude for APU Bleed Air for Air Conditioning & Pressurisation?

A

15,000ft

26
Q

What are the APU Cooling Periods after each Start Attempt?

A

1st & 2nd Attempt - 60 Seconds
3rd Attempt - 5 minutes

27
Q

What is the APU primarily used for?

A

As an on ground pneumatic source for both the air conditioning packs and engine starting

28
Q

What is the purpose of the APU?

A

To Provide:
Pneumatic power - for both engine start, and to supply bleed air to the air conditioning packs
Electrical Power - via an AC Generator

28
Q

What is the APU, and where is it located?

A

A Gas Turbine Engine, located in the Tailcone

29
Q

At what speed does the APU operate?

A

Constant

30
Q

Where is the APU Air Inlet Valve Located?

A

On the bottom of the tailcone

31
Q

What electrical power does the APU supply?

A

AC Power 115V 40kVA

32
Q

When can the APU provide bleed air?

A

Both on the Ground and in Flight

33
Q

During APU Start, what happens when you momentarily move the APU Master Selector Knob from ON > START?

A

The APU Start Cycle is initiated

FADEC commands the electronic starter controller to energise the brushless starter generator, initiating APU rotation

7% - FADEC commands the module to open and energise the exciter

50% - The ignition and starter are de-energised and the APU begins to run on its own

34
Q

At what Rotor Speed will the APU begin to run on its own?

A

50%

35
Q

When will Pneumatic & Electrical Services become available after APU start?

A

3 seconds after APU has reached 95% Rotor Speed

36
Q

What happens if the APU does not reach proper speed or acceleration rate within the Starting Cycle time?

A

The APU will automatically shut down

37
Q

What does an APU FAIL EICAS message indicate?

A

APU Automatic Shutdown has occured

38
Q

Can the APU be restarted following an Automatic Shutdown?

A

No, unless it occurred during the starting cycle (subject to restrictions)

39
Q

Following a Normal APU Shutdown when is Pneumatic Power removed?

A

Immediately

40
Q

Following a Normal APU Shutdown, when is Electrical Power removed?

A

Following a 1 minute Cooldown period
(2 minutes PRE MOD)

41
Q

What happens during a normal APU Shutdown?

A

APU SHUTTING DOWN EICAS Message
APU Pneumatic Power Removed Immediately
Electrical Power Removed after a Cooldown Period
Spooldown Period (POST MOD ONLY)
APU SHUTTING DOWN EICAS Message Removed

42
Q

Why does the APU continue to run when selected OFF?

A

If the APU is the only source of AC Power it remains on for the entire shutdown process including cooldown/spooldown periods.

If it is not the only AC Power Source it will be taken offline as soon as the APU Master Selector Knob is moved from ON > OFF

43
Q

How long should you wait after APU Shutdown before turning off the batteries and why?

A

8 seconds, because if power is removed from the APU Fuel Shutoff Valve during its opening/closing, it may result in a fuel leak

Embraer 190 Technical (20 decks)

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