SH Chapter 7 - Engines And APU Flashcards

1
Q

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

A

Automatic is under full authority of FADEC. Manual used if auto start is unsuccessful due to engine stall, EGT over limit, or low air pressure

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2
Q

2) When would you use a manual start?

A

When an auto start unsuccessful due to engine stall, EGT over limit and low start air pressure
Also when we have a marginal pneumatic source, such as high alt or hot conditions causing reduced EGT margins on APU.
Also with intermittent ECAM ENG 1(2), IGN A(B) fault alert during first start of the day.

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3
Q

3) What controls the engines in all operating regimes?

A

FADEC

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4
Q

4) What functions does the FADEC control?

A

All engine parameters and starts

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5
Q

5) Describe the redundancy of the FADEC

A

Two channels. One active and one standby.

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6
Q

6) What is the power source for the FADEC?

A

Engine Control Unit (ECU) magnetic alternator. If this fails, auto switches to a/c electrical power

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7
Q

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

A

None

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8
Q

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

A

Modulated Idle
- Bleed system demands and ambient conditions (in flight when flaps retracted and ground, except reverse)
Approach Idle
- When flaps extended, regulated according to altitude to allow faster acceleration from idle to go around
Reverse Idle
- Slightly higher than forward idle thrust

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9
Q

9) When will the FADEC abort a start?

A
Hot start
Hung start
Stall
No light up
Low start air pressure
Starter time exceeded 
Thrust levers not at idle
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10
Q

10) How is the IDG cooled?

A

Fuel/oil heat exchanger

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11
Q

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

A

Both

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12
Q

12) How many igniters fire during a manual start?

A

Both

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13
Q

13) When does continuous ignition automatically operate?

A

When commanded by FADEC, when:

  • Engine flameout detected
  • Possible EIU failure
  • Ignition delay during start
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14
Q

14) What is the active range of the A/THR?

A

Just above idle to CL detent or MCT detent with OEI

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15
Q

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

A

FMGC computes the thrust limited to the value corresponding to the lever position, except in Alpha Floor.

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16
Q

16) What are 3 ways to disconnect the A/THR?

A

Instinctive button
Thrust levers to idle
A/THR pb on FCU

17
Q

17) What controls the engine LP fuel valves?

A

Moving ENG 1(2) master to off or pushing ENG FIRE pb

18
Q

18) What does a fault light on the ENG panel indicate?

A

Position of HP fuel shutoff valve is abnormal
Auto start sequence aborts
Malfunction in thrust control

19
Q

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

A

N is above 99.5% or two seconds after N reaches 95%

20
Q

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

A

3 seconds

21
Q

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

A

Auto shutdown occurs (ie over speed, no acceleration, etc)

22
Q

22) When does the APU fuel pump run?

A

Automatically if pressure from the left tank pumps not available (batteries only or pumps off)