35. Engines / Thrust Levers (Power Plant/ Auto Flight)

Question 1

What controls the engines in all operating regimes?

Answer 1

FADECs (Full Authority Digital Engine Controls)

Question 2

What is the power source for the FADEC?

Answer 2

• The system has its own alternator making it independent of the aircraft electrical system when N2 is above10%

• If this alternator fails, the FADEC automatically switches to aircraft electrical power

Question 3

The FADEC detects a fault during automatic start. What crew intervention is required?

Answer 3

There is no crew intervention necessary. The FADEC will discontinue the start, dry crank to clear the fuel from the engine, and attempt a restart (if warranted) automatically.

Question 4

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

Answer 4

• One igniter with the other serving as a backup

• The FADEC automatically alternates the igniters (A or B) at each start

Question 5

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

Answer 5

• Two, both A and B

Question 6

On the ground, how can the A/THR be armed?

Answer 6

• By setting the thrust levers in the TOGA or FLEX gate (with a FLEX temperature inserted in the MCDU)

• At least one FD must be ON for A/THR to arm during takeoff

Question 7

What is the active range of the A/THR?

Answer 7

• Just above IDLE to the CL detent (2 engines)

• Just above IDLE to the MCT detent (1 engine

Question 8

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

Answer 8

The thrust lever angle

Question 9

What are three ways to disconnect the A/THR?

Answer 9

• A/THR pushbutton

• Instinctive disconnect pushbuttons

• Thrust levers to IDLE

Question 10

What is the proper method of disconnecting A/THR?

Answer 10

Set the thrust lever angle to the existing EPR and push the instinctive disconnect pushbuttons

Question 11

How would the A/THR be disconnected for the remainder of the flight?

Answer 11

Press and hold the instinctive disconnect pushbutton for 15 seconds. The A/THR cannot be re-engaged once this is done. ALPHA FLOOR is also lost if this is done

Question 12

What happens to thrust and what annunciates on the FMA during ALPHA FLOOR?

Answer 12

• Thrust – TOGA

• FMA – “A.FLOOR”

Question 13

When does the aircraft leave ALPHA FLOOR and what does the FMA change to?

Answer 13

Upon reaching a lower angle of attack. The FMA changes to “TOGA LK”

Question 14

What should the pilot do to get out of TOGA LOCK?

Answer 14

• Push the instinctive disconnect pushbuttons and move the THRUST LEVERS to the CL detent, if not already in the climb detent

• Afterwards re-engage the autothrust

Question 15

When will ALPHA FLOOR activate?

Answer 15

When the aircraft reaches a high AOA

Question 16

When would thrust lock occur?

Answer 16

• Thrust levers in CL detent and A/THR pushbutton on the FCU is pushed, or
• A/THR disconnects due to a failure

Question 17

How is A/THR normally armed?

Answer 17

By advancing the thrust levers to TOGA or FLX

Question 18

What would be the normal FMA indications during a takeoff roll using FLEX thrust on a RWY with a localizer?

Answer 18

MAN FLX, SRS, RWY, A/THR (blue)

Question 19

What would the FMA indications be during a takeoff roll using TOGA thrust on a runway without a localizer?

Answer 19

MAN TOGA, SRS, A/THR (blue)

Question 20

What would the FMA indications be during takeoff roll if the A/THR didn’t arm on a runway with a localizer? Should the takeoff be aborted?

Answer 20

• SRS, RWY

• Continuing the takeoff is a safe option, but the thrust levers must be moved to the climb detent at thrust reduction altitude and the crew must manually engage A/THR

Question 21

How should A/THR be turned off?

Answer 21

Match the blue thrust lever angle indicators to the present thrust setting on the EWD and push the instinctive disconnect pushbuttons or move THRUST LEVERS to IDLE

Question 22

What should the pilot do to get out of THRUST LOCK?

Answer 22

Move it out of the climb detent

Question 23

What controls the engine LP fuel valves?

Answer 23

• Engine MASTER switch

• ENGINE FIRE pushbutton

Question 24

What does a FAULT light on the ENG panel indicate?

Answer 24

• The position of the HP fuel shut off valve is abnormal, or

• Automatic start sequence of the associated engine aborts, or

• There is a malfunction of the thrust control

Question 25

Differences - When does continuous ignition automatically operate?

Answer 25

When does continuous ignition automatically operate?

• PW1100G
o Engine flame out detected
o Surge detected
o Thrust control malfunction detected
o Ignition delay during start

• IAE V2500
o Engine anti-ice PB switch at ON
o Max TO thrust selected (EPR or Rated N1 mode)
o Flex to thrust selected (EPR mode)
o EIU data failed (ignition and/or bleed config data)
o Approach idle selected
o Inflight unscheduled sub idle or surge
o Master lever cycled from ON to OFF then back to ON position

Question 26

Differences - What is the required engine warm up time?

Answer 26

• IAE V2500/PW1100G Shutdown < 2hrs = 3 Mins

• IAE V2500/PW1100G Shutdown > 2hrs = 5 Mins

Question 27

Differences - What is the required engine cool down time after landing?

Answer 27

3 Mins for all aircraft

Question 28

What does the green cooling indication mean on the E/WD for NEO Aircraft?

Answer 28

It’s displayed when an auto dry crank is required to cool the engines before engine start.

Question 29

If icing conditions exist on the ground, how is the Engine Run-up procedure different for NEO and non-NEO aircraft?

Answer 29

• IAE V2500 = Accelerate to Minimum of 50% N1 at intervals not more than 15 minutes apart

• PW1100G = Accelerate to Minimum of 60% N1 at intervals not more than 30 minutes apart

Question 30

If during start, the ground crew reports a fuel leak from the engine, what should be done by the flight crew?

Answer 30

PW1100G = Abort the engine start sequence, Maintenance action is Required

Question 31

How is Approach Idle different on NEO vs non-Neo aircraft?

Answer 31

• Non-NEO Minimum Approach Idle Speed occurs when:

o Aircraft is in flight and the flaps are extended (flap lever not at 0 position)

• NEO Minimum Approach Idle Speed occurs when:

o Aircraft is in flight and the flaps are at CONF 3 or FULL or when the landing gear is down