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C5 E145 Nov 2020 > Systems - APU and Powerplant > Flashcards

Systems - APU and Powerplant Flashcards

1
Q

What does turning the APU Master knob to the ON position do?

A
  • Energizes the Electronic Sequence Unit (ESU) (or FADEC)
  • Commands the fuel shutoff valve to open
  • Enables indication and alarms on the EICAS-
  • Allows the APU to keep running after starting
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2
Q

Where is the APU located?

A

Tailcone of the aircraft, aft of a firewall

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3
Q

What are the different electrical sources used to start the APU?

A
  • Battery 2
  • Battery 2 assisted by engine driven generator(s)
  • Ground Power Unit
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4
Q

After starting, when is electrical power available from the APU?

A

7 seconds after reaching 95% rotor speed

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5
Q

When does the APU starter-generator disengage during the start cycle?

A

When rotor speed exceeds 50%, the FADEC de-energizes the starter (at 70% rotor speed the FADEC de-energizes the ignition exciter).

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6
Q

How does the APU receive its fuel?

A

Tank #2

(Can receive fuel from Tank #1 if Crossfeed is selected to LOW2 and electric fuel pump for Wing Tank #1 is on..

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7
Q

What controls the start and normal operation of the APU?

A

The Electronic Sequence Unit (ESU)

the APU’s own FADEC

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8
Q

Which electrical busses can the APU energize as the sole source of electrical power?

A

In flight: all main busses except Shed busses

On ground: all busses provided the Shed Bus switch is in OVRD position

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9
Q

What is the max altitude for an APU start?

A

FL300

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10
Q

What is the max altitude for APU operation?

A

FL370

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11
Q

What are the required cool-down periods for APU start?

A

Between three consecutive attempts: 1 min off

Between two series of three consecutive attempts 30 mins off

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12
Q

How is a fire detected in the APU?

A

By it’s own dedicated fire loop

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13
Q

How is a fire extinguished in the APU?

A

By it’s own dedicated extinguishing bottle.

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14
Q

What does the APU Fire Extinguishing Button do?

A
  • Closes APU fuel shutoff valve

- Discharges APU fire bottle

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15
Q

Under what conditions will the APU automatic shutdown occur (on the ground / in flight)?

A

On ground: any fire, fault or failure
In flight any fault or failure
[for full list see ASM 37-9.1]

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16
Q

What is the max electrical load allowed on the APU generator?

A

Up to FL300: 400A

Above FL300: 300A

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17
Q

What is the minimum battery temperature and voltage for APU start?

A

Min temp: -20ºC
Min battery voltage: 23.5 (battery or GPU start ok)
- 19V to 23.5V: GPU required for start
- below 19V: battery must be removed (recharged by maintenance)

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18
Q

What type of engines are on the aircraft?

A

Rolls Royce AE3007A1E

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19
Q

What are the 3 pilot selectable thrust modes for takeoff?

A

ALT T/O-1: normal - best durability and economy
T/O: medium thrust level
E T/O: highest level

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20
Q

Which two compressor stages are bleed air tapped from?

A

9th and 14th stages

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21
Q

When does the high-stage valve automatically open to allow 14th stage bleed air to supply the system?

A
  • low thrust settings
  • cross-bleed starts
  • pneumatic anti-ice activated
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22
Q

How is the accessory gearbox powered?

A

Via a tower shaft connected to the high pressure turbine (N2)

23
Q

Which components are located on the accessory gear box?

A 
HOPFAG
Hydraulic Pumps
Oil Pumps
Permanent Magnetic Alternators
Fuel Pumps
Air Turbine Starter
Generators (DC)
24
Q

What are the three sources of air for engine start?

A
  • APU bleed air
  • Cross bleed air (requires 83% N2 on operating eng)
  • External air
25
Q

What is the preferred source of air for engine start?

A

APU bleed air

26
Q

What is the FPMU and what does it do?

A
  • Controls and supplies fuel to engine nozzles

- Controls the compressor variable geometry vanes

27
Q

What controls operation of the FPMU?

A

FADEC

28
Q

How does the fuel shutoff valve work?

A

Located in the wing box in the belly of the aircraft, can only be activated by pulling the engine fire extinguishing T-handle.

29
Q

What are the two ways pilots can shut off fuel to the engines?

A

Start/Stop Selector: cuts off fuel at the engine

Fire Extinguishing Handle: closes fuel shutoff valve at fuel source in wing box.

(If only T-handle is pulled, engine may continue to operate for up to 1 minute.)

30
Q

Which MFD page displays engine oil quantity and pressure?

A

Oil qty: MFD T/O page

Oil Press: EICAS

31
Q

What is the minimum oil level for dispatch?

A

8 quarts

32
Q

When does the engine oil quantity indication text turn amber?

A

Below 6 quarts

33
Q

What is the primary source for engine control?

A

FADEC

34
Q

What provides the engine ignition source?

A

Permanent Magnetic Alternators (PMAs)

On engine AGB driven by N2 via tower shaft.

35
Q

At what N2 rotor speed will the igniters energize on start?

A

At around 10% N2, there is enough rotation to drive the tower shaft and PMAs to power the igniters.

36
Q

When do the FADECs begin to receive power on start?

A

At 50% N2, PMAs will begin to power the FADECs.

37
Q

How is the FADEC powered below 50% N2?

A

Essential busses

38
Q

How do the PMAs work?

A

Self-contained magnets - convert mechanical energy into electrical energy. Generates an ignition source for engines then powers the FADECs.

39
Q

How many igniters are in each engine?

A

2 igniters per engine

40
Q

What does the Engine Ignition Switch in the AUTO position do?

A

Allows the FADEC to control how many igniters are used for start:

  • on ground: 1 igniter for normal start
  • auto-relight: 2 igniters (ground or in flight)
41
Q

What does the Ignition switch in the cockpit control?

A

OFF: no igniters fire / engine fuel valve remains closed if the engine is not running (used for dry-motoring); valve remains open if engine is at least in IDLE.

ON: ignition remains constant with both igniters firing.

42
Q

What thrust is provided when the thrust lever is in the detent position?

A

Full thrust for a given thrust mode (commanded by FADEC).

43
Q

Where is the FADEC in command displayed?

A

On the EICAS, either A or B.

44
Q

What happens when there is an inadvertent thrust reverser deployment in flight?

A

The FADEC automatically brings the thrust in the respective engine to IDLE, regardless of thrust lever angle.

45
Q

How is the max available thrust for each selected takeoff thrust rating calculated?

A

By the FADEC with input from the pilot via the MFD T/O page (thrust mode, temp, and anti-ice mode).
If takeoff data is not selected, the FADEC reverts to E T/O.

46
Q

What happens if the thrust lever is forward of the IDLE position and the Start/Stop selectors are placed in the stop position?

A

The respective engine will NOT shut down without the thrust lever in the IDLE position.

47
Q

What is the purpose of the ATTCS?

A

When the engine fails, the system automatically increases thrust on the operating engine to increase single-engine performance.

48
Q

When will the FADEC select T/O RSV mode?

T/O mode?

A

When ATTCS receives an eng out signal.
ALT T/O-1 —> T/O-1
T/O —> T/O RSV
E T/O —> E T/O RSV

49
Q

What indication would indicate takeoff data was not accepted by the FADEC?

A

ENG NO T/O DATA displayed on EICAS

In the event data is not entered, FADECs revert to E T/O thrust.

50
Q

How are thrust reversers activated/actuated/locked?

A
  • electrically activated
  • hydraulically actuated
  • mechanically and hydraulically locked
51
Q

What are the engine abort start criteria?

A
  • No light off 10 seconds after fuel flow
  • ITT approaches start limit (800°C) (hot start)
  • N2 decreases/remains steady for > 30 sec (hung start)
  • N2 indicates no rotation up to 10 sec after start
  • Any unusual noise or vibration
  • Engine instruments indicate abnormal conditions
  • Flames are visible
  • Oil pressure does not reach 34 psi when stable
52
Q

APU start is always accomplished using what kind of power?

A

Electrical

53
Q

What does the E1(2) OIL LOW PRESS EICAS warning indicate?

A

Oil pressure < 34 psi

C5 E145 Nov 2020 (10 decks)

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