ENGINES / THRUST LEVERS Flashcards Preview

Spirit Oral Study Guide > ENGINES / THRUST LEVERS > Flashcards

Flashcards in ENGINES / THRUST LEVERS Deck (32):
1

What controls the engines in all operating regimes?

FADEC’s (Full Authority Digital Engine Controls)

2

What functions does the FADEC control?

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

3

What redundancy does the FADEC have?

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

4

What is the power source for the FADEC?

• 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

5

When will the FADEC abort a start?

• Only during a normal automatic start on the ground
• Hot start
• Stalled start
• No ignition

6

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

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

7

When does the FADEC command a higher engine idle speed?

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

8

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

• One igniter with the other serving as a backup
• The FADEC automatically alternates the igniters (A and B) at each start

9

How many igniters fire on Manual or In-flight starts?

Both A and B

10

When does continuous ignition automatically operate?

• Approach idle selected (in flight, slats extended)
• Engine Anti-ice ON
• Engine flameout detection
• Failure of the EIU

11

What are the 5 detent positions of the thrust levers?

• TOGA
• FLX MCT
• CL
• IDLE
• IDLE REV
• MAX REV

12

On the ground, how do you arm the A/THR?

• By setting the thrust levers in the TOGA or FLEX gate (with a FLEX temperature inserted in the MCDU)
• At least one FD bust be ON for A/THR to arm during takeoff

13

What is the active range of the A/THR?

• Just above IDLE to the CL detent (2 engines)
• Just above IDLE to the MCT detent (1 engine)

14

What is the normal operational position of the thrust levers when A/THR is active?

The CL detent

15

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

The position detent of the thrust lever

16

What are 3 ways to disconnect the A/THR?

• A/THR pb
• Instinctive Disconnect buttons
• Thrust Levers to IDLE

17

What is the preferred method of disconnecting A/THR?

Set the thrust levers to match the TLA to the existing EPR and disconnect using the instinctive disconnect pb

18

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

Press and hold an Instinctive Disconnect button for 15 seconds

19

Will you be able to restore A/THR?

No

20

What else will you lose?

Alpha Floor Protection

21

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

• Thrust – TOGA
• FMA – A.FLOOR

22

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

FMA changes to TOGA LK

23

How do you then regain normal A/THR?

• Move Thrust Levers to the TOGA detent
• Press an Instinctive Disconnect button
• Return Thrust Levers to CL detent
• Push the A/THR pb to engage A/THR

24

When is Alpha Floor Protection active?

From lift-off through 100 feet RA on approach

25

When would Thrust Lock occur?

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

26

Explain the Normal start sequence?

• ENG MODE to IGN/START
• ENG MASTER to ON
• Start Valve Opens, LP fuel valve opens and gray N2 background appears
• After 30 seconds dry crank, Ignition (A or B) on, HP fuel valve opens
• At ≥ 43% N2 starter cutout, Ignition stops
• Approximately 58% gray N2 background disappears
• Idle approximately 21% N1,58% N2 EGT 415°C, fuel flow 775 pph,

27

Explain the Manual start sequence?

• ENG MODE to IGN/START
• ENG MAN START pb ON
• Start valve opens
• 30 seconds after ENG MAN START pb ON and maximum N2 motoring speed (min 15%), ENG MASTER ON
• Observe AB Ignition, fuel flow increase, EGT and N1 increase in 15 seconds
• At ≥ 43% N2 observe starter cutout and if on the ground, Ignition off
• ENG MAN START pb – OFF

28

What controls the engine LP fuel valves?

• Engine MASTER switch
• ENGINE FIRE pb

29

What does a fault light on the ENG panel indicate?

• Auto Start Abort
• Switch disagreement between HP valve and it’s commanded position

30

What is the rated thrust of each engine?

• A319 – 24,500 lb

31

How many transponders are installed?

2

32

Does illumination of the ATC FAIL light indicate loss of all transponder capability?

No – only the selected transponder has failed