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Allegiant Airbus 320 > Powerplant (Non Oral Exam Guide) > Flashcards

Powerplant (Non Oral Exam Guide) Flashcards

1
Q

What type of engine do we have

A

CFM-56: high-bypass ratio, twin spool, axial flow turbofan

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2
Q

How many igniters

A

A and B

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3
Q

What components are part of the engine gear box?

A
  • lubrication unit, including the engine oil pumps
  • engine fuel pumps and FCU
  • FADEC
  • IDG
  • engine starter
  • engine hydraulic pump
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4
Q

What is FADEC?

A

Full Authority Digital Engine Control: computer that interfaces with numerous aircraft systems to control engine operation and performance

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5
Q

What types of functions does the FADEC perform?

A
  • control of gas generation
  • protection against engine exceeding limitations
  • power management
  • automatic and manual engine starting sequencing
  • thrust reverser control
  • fuel recirculation control
  • detection, isolation, and recording of failures
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6
Q

How is the FADEC powered?

A

An internal magnetic alternator

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7
Q

In the event the FADEC’s alternator fails, what happens?

A

The FADEC will revert to aircraft electrical power

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8
Q

When is FADEC self-powered?

A

When N2 is above 12%

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9
Q

How can we tell if the FADEC is not powered?

A

Engine indications are replaced with amber X’s

*also appear 5 mins after engine shutdown

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10
Q

What redundancy does the FADEC have?

A
  • Dual channel redundancy- one channel is active while the other is standby
  • If one channel fails, the other automatically takes control
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11
Q

Regarding fuel, what does moving the ENG MASTER switch to off do?

A
  • Commands the closing of the LP and HP fuel shut off valves for that engine’s fuel system
  • closes the fuel return valve and opens the bypass valve
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12
Q

During an automatic engine start, what controls the HP Fuel Shutoff Valve?

A

FADEC

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13
Q

What igniter must be operational for all flights? Why?

A

Igniter A- only igniter powered when in the Emergency Electrical Configuration mode

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14
Q

When will FADEC activate and terminate ignition?

A

Activate when N2 reaches 16% and terminates when N2 reaches 50%

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15
Q

What conditions will FADEC automatically activate continuous ignition?

A
  • when a delayed engine start is sensed
  • when the Engine Interface Unit (EIU) fails
  • when an engine flameout is detected
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16
Q

What is different for the igniters during a manual engine start?

A

FADEC activates both igniters when the Engine Master switch is placed ON. Ignition stopped when N2 reaches 50%

17
Q

What is the Thrust Lever Angle (TLA)?

A

Thrust rating limit and N1 for given position of thrust levers

18
Q

What are the 3 different idle modes?

A
  • Modulated Idle
  • Approach Idle
  • Reverse Idle
19
Q

What is Modulated Idle?

A

Regulates thrust according to bleed system demands and ambient temps

  • In flight: when the flaps are retracted
  • On the ground: when reverse is not selected
20
Q

What is Approach Idle?

A

Engages in flight when flaps are extended. Idle is regulated according to altitude and is not dependent on bleed system demand

21
Q

What is Reverse Idle?

A

Engages on the ground and the thrust lever is in the Reverse Idle position. Reverse Idle is slightly higher than forward idle thrust

22
Q

When does FADEC command a higher engine idle speed?

A
  • bleed demands
  • high engine or IDG temps
  • Approach configuration
23
Q

During start, FADEC controls monitoring and sequencing of:

A
  • start valve opening and closing
  • ignition activation and termination
  • fuel valve opening
  • N1, N2, and EGT exceedance protection
24
Q

What is the manual start sequence?

A
  1. ENG MODE selector: Ignition/Start
  2. Engine Manual Start pushbutton: ON (engages starter and windmills engine)
  3. When max motoring speed reached: ENG Master switch: ON (activates ignition for both igniters and opens LP and HP fuel valves)
25
Q

Does FADEC have abort authority during a manual start?

A

No, only passively monitors the start and displays sensed abnormalities on the E/WD

26
Q

Compared to an automatic start, what protections are not provided with a manual start?

A
  • will not provide EGT exceedance protection (unless EGT limit is exceeded prior to 50% N2, then FADEC aborts the start)
  • still provides N1 and N2 exceedance protection
27
Q

Does FADEC have abort authority during an inflight relight?

A

No

28
Q

When does the automatic relight logic activate?

A

When FADEC senses that engine’s N2 RPM has decreased below a pre-set limit

29
Q

What does a fault light on the ENG panel indicate?

A
  • auto start abort
  • position of FUEL HP shutoff valve abnormal
  • malfunction of the thrust control
30
Q

What determines the max thrust the A/THR system will be able to command?

A

The position detent of the thrust lever

31
Q

During a normal automatic start sequence; what does moving the ENG Master switch to ON do?

A
  • LP fuel valve opens
  • start valve opens
  • APU speed increases
  • ignition starts: when N2>16%
  • N2>50%: start valve closes, igniter off (if on ground), APU speed returns to norm, pack valve reopens after 30 secs
32
Q

What does pushing the ENG FIRE pushbutton do?

A
  • silences aural fire warning
  • arms fire extinguisher squibs
  • closes the low-pressure fuel valve
  • closes the hydraulic fire shut off valve
  • closes the engine bleed valve
  • closes the pack flow control valve
  • cuts off FADEC supply power
  • deactivates the IDG
33
Q

What occurs when the engine fire TEST button is pressed?

A
  • continuous repetitive chime sounds (CRC)
  • MASTER WARN lights flash
  • ENG FIRE on the ECAM
  • ENG FIRE pushbutton illuminates in red
  • SQUIB and DISC light illuminate
  • FIRE lights on ENG panel on pedestal
34
Q

When will FADEC abort a start?

A
  • stalled start
  • no light up
  • hot start, hung start

Allegiant Airbus 320 (18 decks)

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