Engines

Question 1

Q1 | ENGINE PANEL

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

[ FCOM-DSC-70-80-40 ]

Answer 1

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

Manual Start:
The FADEC makes a passive survey of the engine during the start sequence and the flight crew is made aware of an abnormal start by a proper ECAM warning. The FADEC does not have the authority to abort the start and the flight crew has to interrupt the starting sequence. (Except if EGT limit is exceeded prior to 50% N2 on ground)

[ FCOM-DSC-70-80-40 ]

Question 2

Q2 | 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

[ FCOM-PRO-SUP-ENG ]

Question 3

Q3 | ENGINE / THRUST LEVERS

What controls the engines in all operating regimes?

[ FCOM-DSC-70-20 ]

Answer 3

FADECs (Full Authority Digital Engine Controls)

[ FCOM-DSC-70-20 ]

Question 4

Q4 | ENGINE / THRUST LEVERS

What functions does the FADEC control?

[ FCOM-DSC-70-20 ]

Answer 4

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

[ FCOM-DSC-70-20 ]

Question 5

Q5 | ENGINE / THRUST LEVERS

What redundancy does the FADEC have?

[ FCOM-DSC-70-20 ]

Answer 5

Dual Channel Redundancy – one channel is active while the other is standby

[ FCOM-DSC-70-20 ]

Question 6

Q6 | ENGINE / THRUST LEVERS

When does continuous ignition automatically operate?

[ FCOM-DSC-70-80-30 ]

Answer 6

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

[ FCOM-DSC-70-80-30 ]

Question 7

Q7 | ENGINE / THRUST LEVERS

How many igniters fire on manual or in-flight starts?

[ FCOM-DSC-70-80-30 ]

Answer 7

Both A and B

[ FCOM-DSC-70-80-30 ]

Question 8

Q8 | ENGINE / THRUST LEVERS

What is the power source for the FADEC?

[ FCOM-DSC-70-20, FCOM-DSC-70-98 ]

Answer 8

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

[ FCOM-DSC-70-20, FCOM-DSC-70-98 ]

Question 9

Q9 | ENGINE / THRUST LEVERS

When will the FADEC abort a start?

[ FCOM-DSC-70-80-40 ]

Answer 9

• Hot start
• Stalled start
• No ignition

[ FCOM-DSC-70-80-40 ]

Question 10

Q10 | 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

[ FCOM-DSC-70-80-40 ]

Question 11

Q11 | 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

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

[ FCOM-DSC-70-40-40, FCOM-DSC-70-40-50 ]

Question 12

Q12 | ENGINE / THRUST LEVERS

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

[ FCOM-DSC-70-30-30 ]

Answer 12

The position detent of the thrust lever

[ FCOM-DSC-70-30-30 ]

Question 13

Q13 | ENGINE / THRUST LEVERS

What controls the engine LP fuel valves?

[ FCOM-DSC-70-40-10 ]

Answer 13

• Engine MASTER switch
• ENGINE FIRE pushbutton

[ FCOM-DSC-70-40-10 ]

Question 14

Q14 | ENGINE / THRUST LEVERS

What does a fault light on the ENG panel indicate?

[ FCOM-DSC-70-90 ]

Answer 14

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

[ FCOM-DSC-70-90 ]