Review Questions - Engines, APU Flashcards Preview

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Flashcards in Review Questions - Engines, APU Deck (22)
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1
Q

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

A

a. 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
b. Manual Start - Automatic start interruption and auto-crank are not available

2
Q

When would you use a manual start?

A

After aborting a start because of:

a. Engine stall
b. Engine EGT overlimit
c. Low start air pressure

When expecting a start abort because of:

d. Degraded bleed performance due to hot conditions or at high altitude airports
e. Marginal pneumatic source
f. (A320) Intermittent ECAM ENG 1(2) IGN A(B)FAULT alert dring the first start of the day.

3
Q

What controls the engines in all operating regimes?

A

FADEC

4
Q

What functions does the FADEC control?

A

a. Control of gas generator
b. Protection against engine exceeding limits
c. Power management
d. Automatic engine starting sequence
e. Manual engine starting sequence
f. Thrust reverser control
g. Fuel recirculation control
h. Transmission of engine parameters and engine monitoring information to Flight Deck indicators

(Acronym anyone?)

5
Q

Describe the redundancy of the FADEC

A

The FADEC system has two-channel redundancy, with one channel active and one in standby. If one channel fails, the other automatically takes control.

6
Q

What is the power source for the FADEC?

A

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

7
Q

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

A

No. The FADEC will (on the ground):

  • close the HP valve
  • close the start valve
  • turn off ignition
  • ensure an automatic dry crank cycle after the abort sequence in order to remove the fuel vapors
  • control any additional start attempts
8
Q

When does the Idle Control function of the FADEC system regulate idle speed?

A

Modulated Idle: Regulateed according to bleed system demand and ambient conditions.

Approach Idle: Regulated according to aircraft altitude, regardless of bleed system demand. Also selected in flt when flaps are extended and alows engines to accelerate rapidly from idle to go around thrust.

Reverse Idle: Reverse idle mode is slightly higher than forward idle thrust.

9
Q

When will the FADEC abort a start?

A

On the ground:

a. Hot start
b. Hung start
c. Stalled start
d. No light up
e. Low start air pressure,
f. Starter time exceeded
g. Thrust lever not at idle

10
Q

How is the IDG cooled?

A

IDG fuel/oil heat exchanger

11
Q

How many igniters fire on an in-flight start attempt?

A

Both A and B

12
Q

How many igniters fire during a manual start?

A

Both A and B

13
Q

When does continuous ignition automatically operate?

A

a. Engine flameout detection
b. Failure of the Engine Interface Unit (EIU)
c. If there is an ignition delay during engine starting

14
Q

What is the active range of the A/THR?

A

a. Just above IDLE to the CL detent (2 engines)
b. Just above IDLE to the MCT detent (1 engine)

15
Q

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

A

The position detent of the thrust lever

16
Q

What are 3 ways to disconnect the A/THR?

A

a. Instinctive Disconnect buttons (recommended method)
b. Thrust Levers to IDLE
c. A/THR push button

17
Q

What controls the engine LP fuel valves?

A

a. Engine MASTER switch
b. ENGINE FIRE pushbutton

18
Q

What does a fault light on the ENG panel indicate?

A

a. The position of the HP fuel shutoff valve is abnormal
b. Auto start abort
c. There is a malfunction of the thrust control

19
Q

What does the green AVAIL light on the APU START pb indicate?

A

APU N is above 99.5% or 2 secs after N reaches 95%

20
Q

How long should you wait to push the APU START pb after engaging the APU MASTER switch?

A

3 Seconds

21
Q

What does an amber FAULT light in the APU MASTER SW pb indicate?

A

An automatic APU shutdown has occurred

22
Q

When does the APU fuel pump run?

A

When the wing or center tank pumps are off or when the aircraft is on battery power only