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A320 Notes > Engines (CFM) > Flashcards

Engines (CFM) Flashcards

2
Q

During engine start the amber FAULT light on the ENG MASTER panel goes on. This indicates…

A

A failure in the automatic start sequence.

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3
Q

Can the engines be overboosted in the TOGA position?

A

No because the ECU provides engine protection limit by monitoring N1 N2 and HMU fuel flow adjustments.

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4
Q

During normal operation at what detent are the thrust levers positioned once the thrust reduction altitude has been reached?

A

CL.

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5
Q

During the automatic start sequence of ENG 2 you noticed that only igniter B is powered. Is this normal?

A

Yes igniters are used alternately for engine start.

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6
Q

Continuous ignition is provided automatically when…

A

Engine flameout is detected and/or the EIU fails.

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7
Q

When does the self powering of the FADEC start?

A

The FADEC system is self-powered above 58% N2.

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8
Q

What is the main parameter to control the engine thrust?

A

N1.

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9
Q

Where can you find the thrust reduction altitude and is the number always the same?

A

TAKE OFF PERF page of the MCDU (it can be modified).

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10
Q

After take off the A/THR will not become active until…

A

The thrust levers are placed in the CLIMB position.

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11
Q

What is required for the FADEC to compute a reduced thrust setting?

A

A FLEX temperature must be entered on the TAKE OFF PERF page of the MCDU.

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12
Q

Holding the A/THR instinctive disconnect pushbutton’s for more than fifteen seconds will…

A

Disengage the A/THR (including Alpha Floor) for the remainder of the flight.

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13
Q

When does the oil pressure indication turn into red?

A

The oil pressure indication turns red and a warning appears on ECAM when the oil pressure drops below 13psi.

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14
Q

What is the purpose of the Hydromechanical Unit (HMU)?

A

The HMU controls fuel flow to the engine combustion chamber controls fuel hydraulic signals to actuators and protects against overspeeding.

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15
Q

What is the function of the FADEC during a manual start?

A

Passive monitoring of the start sequence to close the start valve and cut off the ignition on the ground.

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16
Q

When does oil quantity indication begin to pulse?

A

Decreasing below 5qts.

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17
Q

A few seconds after selecting reverse the amber REV indication changes to green. What does this mean?

A

The reversers are now fully deployed.

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18
Q

When does the oil quantity indication pulse?

A

The indication pulses when oil quantity goes below three quarts (decreasing) or above five quarts increasing.

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19
Q

Which steps of a manual start are being taken care of by the FADEC?

A

Starter valve closure and ignition cut off.

20
Q

When does the oil pressure indication pulse?

A

The indication pulses when oil pressure exceeds 90psi (increasing) or 85psi (decreasing) or oil pressure drops below 16psi (drecreasing) or 20psi (increasing).

21
Q

You are about to take off. You have not inserted a FLEX temperature. Can you still take off?

A

Yes but only using the TO/GA detent.

22
Q

Which idle modes are available?

A

Modulated idle approach idle and reverse idle.

23
Q

During an engine start sequence the grey background on N2 disappears at about 57%. What does this indicate?

A

The start sequence has finished and all engine parameters have stabilized.

24
Q

What are the main components of the CFM 56-xx engine?

A

Low-pressure (LP) compressor/turbine high-pressure (HP) compressor/turbine combustion chamber and accessory gearbox.

25
Q

What controls the engines in all operating regimes?

A

FADECs (Full Authority Digital Engine Control)

26
Q

When would you use a manual start?

A

After aborting a start because of:
- Engine Stall

  • Engine EGT overlimit
  • Low start air pressure

When expecting a start abort because of:
- Degraded bleed performance due to hot conditions or at high altitude airports

  • An engine with a reduced EGT margin in hot conditions or at a high altitude airport
  • Marginal performance of the external pneumatic power group
27
Q

How many igniters fire during a Normal automatic ground start sequence?

A
  • One igniter with the other serving as a backup

- The FADEC automatically alternates the igniters (A and B) at each start

28
Q

How many igniters fire on a manual or in-flight start?

A

Both A and B

29
Q

What control the engine LP fuel valves?

A
  • Engine MASTER switch

- ENGINE FIRE pushbutton

30
Q

What functions does the FADEC control?

A
  • Fuel metering
  • Engine limits based on thrust lever angle
  • Start sequencing
  • Provides engine indications and thrust limit displays on the E/WD
31
Q

What redundancy does the FADEC have?

A

Dual channel redundancy - one channel is active while the other is standby

32
Q

When will the FADEC abort a start?

A
  • Hot Start
  • Stalled Start
  • No Ignition
33
Q

If the FADEC detects a fault during automatic start, is any crew intervention required?

A

No. The FADEC will discontinue the start, clear the engine, and attempt a restart (if warranted) automatically

34
Q

When does the FADEC command a higher engine idle speed?

A
  • Bleed Demands
  • Approach Configuration
  • High engine or IDG temperatures
35
Q

What are the primary differences between an automatic and manual start?

A
  • Automatic Start: The FADEC provides full monitoring during start and will provide appropriate ECAM cautions and procedures to follow in the even of a start fault.
  • Manual Start: Automatic start interruption and auto-crank are not available
36
Q

What is the rated thrust of each engine?

A
  • A319: 23,500 lbs

- A320: 27,000 lbs

37
Q

Explain the Normal Start sequence.

A
  • ENG MODE to IGN/START
  • ENG MASTER to ON
  • Observe Start Valve Open and gray N2 background
  • At 16% N2 Ignition (A or B) on
  • At 22% N2 HP Fuel
  • At 50% N2 starter cutout
  • Approximately 58% grey N2 background disappears
  • Idle at 60%
38
Q

Explain the Manual Start sequence.

A
  • ENG MODE to IGN/START
  • ENG MAN START pushbutton ON
  • At maximum N2 motoring speed (Min 20%), ENG MASTER ON
  • Observe AB ignition, fuel flow increase, EGT and N1 increase in 15 seconds
  • At 50% observe N1 starter cutout and Ignition off
  • ENG MAN START pushbutton OFF
39
Q

What does a fault light on the ENG panel indicate?

A
  • Auto Start Abort

- Switch disagreement between HP valve and its commanded position

40
Q

With the ENG MODE selector in the IGN/START what occurs when you press the ENG MAN START pushbutton?

A
  • The start valve opens

- Both pack flow control valves close

41
Q

What does an amber “FAULT” light in the ENG PUMP pushbutton indicate?

A
  • Pump pressure low
  • Overtemp in the reservoir
  • Low air pressure in the reservoir
  • Low quantity in the reservoir
42
Q

Will the start valve then automatically close?

A

Yes, at 50% N2

43
Q

What causes the amber “FAULT” light on the ENG 1 BLEED and or ENG 2 BLEED pushbutton? (OOLD)

A
  • Overpressure - Downstream of the bleed valve
  • Overheat
  • Leak - low pressure
  • Discontinuity - APU bleed valve open and engine bleed valve not closed or Engine Start with bleed valve not closed
44
Q

What are the two functions of the engine bleed valves?

A
  • Pressure Regulation

- Shut off Valves

A320 Notes (29 decks)

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