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Flashcards in Power Plant Deck (21)
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0
Q

When the Engine is Running, what causes the Igniters to Operate Automatically?

A

EIU failure, flame-out detected and ignition delay during start.

1
Q

When, and for how long, are FADECs powered?

A

First 5 mins after aircraft is powered, then self-powered above 58% N2 until 5 mins after 2nd engine shutdown.

2
Q

What does FADEC do following an Automatic Start Abort?

Hot, Hung, Stall, No Light-off

A

Runs an abort sequence, if a start aborts on the ground, the FADEC:
Closes the HP valve.
Closes the start valve.
Turns off ignition.
Cranks the engine, after the start abort in order to clear out fuel vapours.
Controls any additional start attempts.

3
Q

During a Normal (Auto) Start what happens at 16%, 22% and 50% N2?

A
@ 16% ignition starts.
> 22% HP fuel valve opens -> EGT increases -> N1 increases
> 50% start valve closes, Igniter off
- APU speeds returns to normal
- Pack valves reopen
4
Q

Which is the only Malfunction, which will cause an Auto-abort of an Engine MAN START?

A

On the ground, if the start EGT limit is exceeded before reaching 50% N2, the FADEC aborts the start, in this case only.

5
Q

Man Start: When should the MSTR switch be selected ON?

A

At max N2, at least 20%.

6
Q

Man Start: What happens when the MASTER switch is selected ON?

A

Both igniters comes, LP + HP fuel valves open, when N2 > 50% start valve closes and if on the ground, ignition stops. APU speed returns to normal if APU was used.

7
Q

Man Start: what closes the start valve? And When?

A

FADEC at approximately 50% N2, on the ground, then cutting off the ignition.

8
Q

What causes the FAULT light to illuminate on the engine panel?

A

Amber light comes on, caution appears on ECAM, if there is an automatic start abort, or a disagreement between the HP fuel valve position and its commanded position.

9
Q

What do MAN START pushbuttons control?

A

ON: start valve opens if the ENG MODE selections is set to CRANK or IGN/START and N2 < 20%, both packs valves close during the start sequence, start valves closes when N2 > 50%.

10
Q

What is at One End of the TRANSIENT N1, and what is at the other?

A

Actual N1 (Green) and N1 command (N1 trend) in green.

11
Q

On the EGT what does the amber index indicate?

A

The amber index appears at 725 degrees during engine start, then 915 degrees (max EGT).

12
Q

What does REV in amber / green indicate?

A

Amber: when nay one blocker door is unstowed or unlocked.
Green: when all four doors are fully deployed.

13
Q

How can you tell that the Start Sequence has finished?

A

Amber arc increases from 725 degrees to 915 degrees (max start – max continuous EGT).
Grey background N2 box disappears.

14
Q

When does IDLE flash (between the N1 gauges)?

A

When both engines are idle, it flashes f

15
Q

When is fuel used seat to zero?

A

The green number is computed by the FADEC, it resets when the engine starts on the ground.

16
Q

What is the maximum taxi speed?

A

30kts

17
Q

What are the limiting EGT, and operating time, at TOGA power?

A

635 degrees: 5 mins (2-engines) or 10 mins (1-engine)

18
Q

What are the starter limitations?

A

3 consecutive cycles, 15 sec pause between each attempts.
(Maximum 2 min start cycle time for manual start)

No running engagement of the starter, when N2 is above 10% on the ground and 18% in flight.

30 min cooling period, following 3 starts attempts or 5 min of continuous cranking.

19
Q

What is the minimum IAS for Full Reverse Thrust?

A

70kts

20
Q

Why should Engines be operated at Idle for several minutes before take-off?

A

> 2 mins to ensure centre tank pump test finished, engine wear, to prevent thermal shock.