ENGINES

Question 1

1 | What are the primary differences between an automatic and a manual start? [ FCOM-DSC-70-80-40 ]

Answer 1

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

Question 2

2 | When would you use a manual start? [ FCOM-PRO-SUP-ENG ]

Answer 2

º After aborting a start because of:
- Engine stall
- Engine EGT overlimit
- Low start air pressure
º 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

3 | What controls the engines in all operating regimes? [ FCOM-DSC-70-20 ]

Answer 3

º FADECs (Full Authority Digital Engine Controls)

Question 4

4 | What functions does the FADEC control? [ FCOM-DSC-70-20 ]

Answer 4

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

Question 5

5 | What redundancy does the FADEC have? [ FCOM-DSC-70-20 ]

Answer 5

º Dual channel redundancy – one channel is active while the other is standby

Question 6

6 | When does continuous ignition automatically operate? [ FCOM-DSC-70-80-30 ]

Answer 6

º Engine flameout detection
º Failure of the Engine Interface Unit (EIU)

Question 7

7 | How many igniters fire on manual or in-flight starts? [ FCOM-DSC-70-80-30 ]

Answer 7

º Both A and B

Question 8

8 | What is the power source for the FADEC? [ FCOM-DSC-70-20, FCOM-DSC-70-98 ]

Answer 8

º The system has 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

9 | 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

10 |If the FADEC detects a fault during automatic start, is any crew intervention required? [ FCOM-DSC-70-80-40 ]

Answer 10

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

Question 11

11 |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

12 |What determines the maximum thrust the A/THR system will be able to command? [ FCOM-DSC-70-30-30 ]

Answer 12

º The position detent of the thrust lever

Question 13

13 |What controls the engine LP fuel valves? [ FCOM-DSC-70-40-10 ]

Answer 13

º Engine MASTER switch
º ENGINE FIRE pushbutton

Question 14

14 |What does a fault light on the ENG panel indicate? [ FCOM-DSC-70-90 ]

Answer 14

º Auto start abort
º Switch disagreement between HP valve and its commanded position