Engines / Thrust Levers - Rev 04

Question 1

What controls the engines in all operating regimes?

(FCOM-DSC-70-20)

Answer 1

FADECs (Full Authority Digital Engine Controls)

Question 2

What functions does the FADEC control?

(FCOM-DSC-70-20)

Answer 2

a. Fuel metering

b. Engine limits based on thrust lever angle

c. Start sequencing

d. Provides engine indications and thrust limit displays on the E/WD

Question 3

What redundancy does the FADEC have?

(FCOM-DSC-70-20)

Answer 3

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

Question 4

What is the power source for the FADEC?

(FCOM-DSC-70-20, FCOM-DSC-70-98)

Answer 4

a. The system has its own alternator making it independent of the aircraft electrical system when N2 is above a set value

b. If this alternator fails the FADEC automatically switches to aircraft electrical power

Question 5

When will the FADEC abort a start?

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Answer 5

a. Hot start

b. Stalled start

c. No ignition

Question 6

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

(FCOM-DSC-70-80-40)

Answer 6

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

Question 7

When does the FADEC command a higher engine idle speed?

(FCOM-DSC-70-40-40, FCOM-DSC-70-40-50)

Answer 7

a. Bleed demands

b. Approach Configuration

c. High engine or IDG temperatures

Question 8

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

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Answer 8

Both A and B

Question 9

When does continuous ignition automatically operate?

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Answer 9

a. Engine flameout detection

b. Failure of the Engine Interface Unit (EIU)

Question 10

What is the active range of the A/THR?

(FCOM-DSC-70-30-20, FCOM-DSC-22-30-90)

Answer 10

a. Just above IDLE to the CL detent (2 engines)

b. Just above IDLE to the MCT detent (1 engine)

Question 11

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

(FCOM-DSC-70-30-30)

Answer 11

The position detent of the thrust lever

Question 12

What are 3 ways to disconnect the A/THR?

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Answer 12

a. Instinctive Disconnect buttons

b. Thrust Levers to IDLE

c. A/THR push button

Question 13

How do you disconnect the A/THR for the remainder of the flight?

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Answer 13

Press and hold the Instinctive Disconnect Pushbutton for 15 seconds

Question 14

What would you lose if you held down the Instinctive Disconnect Pushbutton for more than 15 seconds?

(FCOM-DSC-22-30-90)

Answer 14

Alpha Floor Protection

Question 15

What happens to thrust and what annunciates on the FMA when you reach Alpha Floor?

(FCOM-DSC-22-30-90)

Answer 15

a. Thrust – TOGA

b. FMA – A.FLOOR

Question 16

What occurs during Alpha Floor protection after speed increases above Vls?

(FCOM-DSC-22-30-90)

Answer 16

FMA changes to TOGA LK

Question 17

How do you regain normal A/THR when in TOGA LK or THR LK?

(FCOM-DSC-22-30-90)

Answer 17

a. Move Thrust Levers to the TOGA detent

b. Press the Instinctive Disconnect Button

c. Return Thrust Levers to CL detent

d. Push the A/THR pushbutton to engage A/THR

Question 18

When is Alpha Floor Protection active?

(FCOM-DSC-22-30-90)

Answer 18

From lift-off through 100 feet RA on approach

Question 19

When would Thrust Lock occur?

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Answer 19

a. Thrust levers in CL detent and A/THR pushbutton on the FCU is pushed, or

b. A/THR disconnects due to a failure

Question 20

What controls the engine LP fuel valves?

(FCOM-DSC-70-40-10)

Answer 20

a. Engine MASTER switch

b. ENGINE FIRE pushbutton

Question 21

What does a fault light on the ENG panel indicate?

(FCOM-DSC-70-90)

Answer 21

a. Auto start abort

b. Switch disagreement between HP valve and its commanded position