Supplement: Engines / APU

Question 1

Engine panel:
What are the primary differences between an automatic and manual start
FCOM-DSC-70-80-40

Answer 1

Automatic Start
The FADEC provides:
* full monitoring during start
* In the event of a start fault will provide appropriate ECAM cautions and procedures.

Manual Start items not available:

• Automatic start interruption
• auto-crank

Question 2

Engine panel:
When would you use a manual start?
FCOM-PRO-SUP-ENG

Answer 2

• 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 high altitude airports
  • Marginal performance of the external pneumatic power group

Question 3

Engine/thrust levers:
What controls the engines in all operating regimes?
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Answer 3

FADECs

Question 4

Engine/thrust levers:
What functions does the FADEC control?
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Answer 4

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

Question 5

Engine/thrust levers:
What redundancy does the FADEC have?
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Answer 5

Dual Channel redundancy – one channel is active while the other is standby.

Question 6

Engine/thrust levers:
When does continuous ignition automatically operate?
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Answer 6

º Engine flameout detection

º Failure of the Engine Interface Unit (EIU)

Question 7

Engine/thrust levers:
How many igniters fire on manual or in-flight starts?
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Answer 7

Both A and B

Question 8

Engine/thrust levers:
What is the power source for the FADEC?
FCOM-DSC-70-20, FCOM-DSC-70-98

Answer 8

º its own alternator making it independent of the aircraft electrical system when N2 is above a set value.
º If this alternator fails the FADEC automatically switches to aircraft electrical power.

Question 9

Engine/thrust levers:
When will the FADEC abort a start?
FCOM-DSC-70-80-40

Answer 9

º Hot start
º Stalled start
º No ignition

Question 10

Engine/thrust levers:
If the FADEC detects a fault during automatic start, is any crew intervention required?
FCOM-DSC-70-80-40

Answer 10

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

Question 11

Engine/thrust levers:
When does the FADEC command a higher engine idle speed?
FCOM-DSC-70-40-40, FCOM-DSC-70-40-50

Answer 11

º Bleed demands
º Approach Configuration
º High engine or IDG temperatures

Question 12

Engine/thrust levers:
What determines the maximum thrust the A/THR system will be able to command?
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Answer 12

The position detent of the thrust lever

Question 13

Engine/thrust levers:
What controls the engine LP fuel valves?
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Answer 13

º Engine MASTER switch

º ENGINE FIRE pushbutton

Question 14

Engine/thrust levers:
What does a fault light on the ENG panel indicate?
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Answer 14

º Auto start abort

º Switch disagreement between HP valve and its commanded position

Question 15

APU:
What does the green AVAIL light on the APU START pushbutton indicate?
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Answer 15

APU N is above 99.5% or 2 secs after N reaches 95%

Question 16

APU:
With the APU green AVAIL light ON and the EXT PWR green AVAIL light on, which system is powering the
aircraft?
FCOM-DSC-24-10-30-10, FCOM-DSC-24-20

Answer 16

APU

AAA: Avail, Avail, APU

Question 17

APU:
What does an amber FAULT light in the APU MASTER SW pushbutton indicate?
FCOM-DSC-49-20

Answer 17

The Electronic Control Box (ECB) commanded an auto shutdown of the APU

Question 18

APU:
How long should you wait to push the APU START pushbutton after engaging the APU MASTER switch?
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Answer 18

3 sec

Question 19

APU:
What does an amber FAULT light in the APU BLEED pushbutton indicate?
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Answer 19

An APU bleed leak