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B737NG > B737NG Engines and Auxiliary Power Unit > Flashcards

B737NG Engines and Auxiliary Power Unit Flashcards

1
Q

What does the white Autothrottle Limit (A/T LIM) Indicate?

A

The A/T is using a degraded N1 thrust limit.

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2
Q

What does the AMBER ‘ENG FAIL’ alert on the N1 display indicate ?

A

N2 is less than 50%, and the Engine start lever is in the idle position.

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3
Q

What is a blinking START VALVE OPEN indicate?

A

Uncommanded opening of start valve.

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4
Q

What is the highest altitude the APU can supply bleed air? One or two packs?

A

17 000 ft. One

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5
Q

What is the highest altitude the APU can supply both bleed air electrical power ?

A

10 000 ft

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6
Q

Which switches will shut the APU off immediately?

A
  1. Turning off battery switch.
  2. Pulling the APU fire switch in the cockpit.
  3. Pulling the APU fire control switch located in the wheel well.
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7
Q

How many packs can the APU supply bleed air to in flight?

A

One

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8
Q

How is fuel supplied to the APU prevented from icing?

A

fuel is automatically heated

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9
Q

What does AMBER ‘ENG FAIL’ Alert indicate on the N1 display?

A

N2 is less than 50%, with the Engine start lever in the idle position.

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10
Q

What is a blinking START VALVE OPEN indicate?

A

Uncommanded opening of start valve.

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11
Q

May the APU be operated with the blue ‘MAINT’ light illuminated? What does this indicate?

A

Yes, APU maintenance problem exists.

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12
Q

Are the N1 and N2 rotors mechanically connected or free flowing?

A

Mechanically independent.

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13
Q

Is the APU bleed air connected to the N1 or N2 rotor?

A

N2

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14
Q

What is the function of the Engine Electronic computer (EEC)?

A

The EEC monitors auto-throttle and flight crew inputs to automatically set engine thrust and regulate the engine. (Used for fine tuning)

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15
Q

How are engine limitations indicated?

A

Red lines

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16
Q

What happens if an engine red line has been exceeded?

A

The digital readout, box, pointer, and indicator change color to red.

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17
Q

Where do the engines indication get their data from, if the EEC is not powered?

A

Directly from the engine sensors.

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18
Q

How many control modes does each EEC have and what are they?

A

Three modes. One normal and two alternate modes. Hard and soft alternate.

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19
Q

What does the amber ‘ALTN’ and white ‘ON’ light on the EEC button indicate?

A

SOFT alternate mode is active.

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20
Q

How is HARD alternate mode activated on the EEC?

A

By either retarding the thrust lever to idle or manually selecting ALTN with the EEC switch on the aft
overhead panel.

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21
Q

How is HARD alternate mode indicated on the EEC button?

A

The ‘ON’ light is blanked out and ALTN is illuminated only.

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22
Q

Does the HARD ALTERNATE MODE EEC schedule provide more or less thrust than the normal mode for the same lever position?

A

Equal or greater thrust than the normal mode.

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23
Q

Is thrust protection provided in the HARD ALTERNATE mode?

A

No, maximum rated thrust is reached at a thrust lever position less than full forward.

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24
Q

When may engines exceedance occur in Soft Alternate mode?

A

If flight conditions change after the EEC’s enter Soft Alternate mode.

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25
Q

If the engines are operating in Soft Alternate mode, and the thrust levers are retarded to idle, what will be indicated on the EEC button and what mode will the EEC’s operate in?

A

The ALTN switch remains illuminated and the ON indication remains visible, however the EEC’s revert to Hard Alternate mode.

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26
Q

In what modes does the EEC provide overspeed protection?

A

Both normal and alternate modes, however If the EECs are in hard alternate mode, advancing the thrust levers full forward provides some over boost and should be considered only during emergency situations when all other available actions have been taken and terrain contact is imminent.

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27
Q

Does the the EEC provide EGT redline exceedance protection?

A

NO

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28
Q

What over speed protection does the EEC provide?

A

N1 and N2 redline ONLY.

29
Q

What are the idle modes?

A

Ground minimum idle, Flight minimum idle, and
Approach idle.

30
Q

When will approach idle automatically engage?

A

In flight:

  1. If flaps are in landing configuration or engine anti–ice is ON for either engine.

or

  1. After passing FL190 if a fault prevents the EEC from receiving flap or anti–ice signals.
31
Q

How is fuel icing prevented?

A

It passes through two fuel/oil heat exchangers where IDG oil and main engine oil heat the fuel.

32
Q

Can the EEC supply fuel to the engines the spar valve is closed?

A

No

33
Q

What happens when the engine start switches are placed in GRD mode?

A

The engine start switch uses battery power to close the engine bleed air valve and open the start valve to allow pressure to rotate the starter.

34
Q

How does the engine start?

A

The starter rotates the N2 compressor through the accessory drive gear system.

35
Q

When do the starters cutout?

A

56% N2

36
Q

After engine start when do the engine bleed
air valve returns to the selected position, and the start valve close?

A

When the starter motor cuts out. (56% N2)

37
Q

Do EEC’s provide Abnormal Start Protection in flight and/or on the ground?

A

Ground only

38
Q

What is a flashing white box surrounding the EGT
digital readout indicate?

A

An impending hot start is detected by a rapid rise in EGT or EGT is approaching the start limit, or a compressor stall occurs.

39
Q

What will cause the EEC’s to automatically turn off the ignition and shut off fuel to the engine?

A

An impending hot start or stall or if the EGT EXCEEDS the starting limit. Note an impending EGT exceedance will not cause the EEC’s to automatically abort the start.

40
Q

Which bus does the right igniter plug receive power from?

A

AC standby bus

41
Q

How does the NG auto-relight function detect a flameout?

A

A flameout is detected when an uncommanded rapid decrease in N2 occurs, or N2 is below idle RPM.

42
Q

What happens when the EEC’s detect a flameout?

A

Both igniters are automatically activated.

43
Q

What are the in flight starting options?

A

windmill and crossbleed.

44
Q

Below what altitude can the reversers be activated?

A

10 ft RA

45
Q

What indicates the thrust reversers have reached the deployed position?

A

‘REV’ indication illuminates green

46
Q

What does it mean if the ‘REVERSER’ light, located on the aft overhead panel, illuminates for more than approximately 12 seconds after the reversers have been stowed?

A

a malfunction has occurred

47
Q

What could potentially clear the fault and restore normal operation of the reversers?

A

Cycling the thrust reversers

48
Q

Which side does the APU receive fuel from?

A

Left

49
Q

How long can the APU start cycle take ?

A

2 min

50
Q

Will an automatic shutdown occurs in the event of EGT exceedance?

A

Yes?

51
Q

How long should the APU before using it as a bleed air source.

A

2 min

52
Q

How long should the APU run without bleed air before shutting it down?

A

1 min

53
Q

What will cause an Automatic APU shutdown?

A
  1. overspeed conditions,
  2. low oil pressure,
  3. high oil temperature,
  4. APU fire,
  5. fuel control unit failure,
  6. EGT exceedance, and
  7. other system faults monitored by the ECU.
54
Q

If a fluid leak (other than a continuous stream) from any of the engine drains is discovered during the exterior inspection, can the engine can be started?

A

Yes

55
Q

What could happen if an ignition switch fails to stay in GRD until the starter cutout RPM? (56% N2)

A

This could potentially cause a hot start.

56
Q

What should be done if a fluid leak continues after the engine is stable at idle after starting?

A

Run the engine at idle thrust for up to 5 minutes. If the fluid leak stops during this time, no maintenance action is needed, otherwise shut down the engine for maintenance action.

57
Q

When should an engine start be ABORTED?

A
  1. N1 or N2 does not increase or increases very slowly after the EGT increases
  2. No oil pressure indication by the time the engine is stable at idle
  3. EGT does not increase by 15 seconds after the engine start lever is moved to IDLE
  4. EGT quickly nears or exceeds the start limit

Remember S.P.E.L
SLOW
PRESSURE
EGT
LIMITS

58
Q

For extended engine motoring, what is the starter usage limited to and what is the waiting period in between?

A

15 minutes for the first two extended engine motorings. A minimum of 2 minutes is needed between each attempt.

59
Q

For the third and subsequent extended engine motorings, what is starter usage is limited to and what is the waiting period in between?

A

5 minutes, a minimum of 10 minutes is needed between each attempt.

60
Q

After engine starting, when is the engine considered to be at stable idle?

A

when the EGT start limit redline is no longer shown.

61
Q

What does starter operation require?

A

pressurized air and electrical power

62
Q

What does a flashing white box surrounding the EGT digital readout indicate?

A

An impending hot start is detected or a compressor stall occurs

63
Q

What does the EGT display box and dial, turning red indicate?

A

The the EGT exceeds the starting limit.

64
Q

What will happen if the EGT exceeds the starting limit?

A

The EEC automatically turns off the ignition and shuts off fuel to the engine. (Abnormal Start Protection (Ground Starts Only))

65
Q

How is a wet start indicated?

A

if the EGT does not rise after the start lever is moved to IDLE.

66
Q

What will cause the EEC’s to abort a start on the ground?

A

1.) No EGT rise within 15 seconds of moving start lever to IDLE (Wet START)
2.) a rapid rise in EGT or EGT approaching the start limit is detected (Hot START)

67
Q

When is it normal for Oil pressure to indicate amber at or approximately 13 psi?

A

At idle power or when the oil is warm (common during idle descent)

68
Q

Will reverse thrust work if a respective engine fire switch has been pulled?

A

No.

B737NG (16 decks)

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