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B777 Powerplant > Powerplant > Flashcards

Powerplant Flashcards

Powerplant

1
Q

What the primary engine parameters displayed on EICAS?

A

• EPR (Engine Pressure Ratio). • N1. • EGT (Exhaust Gas Temperature).

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2
Q

What are the secondary engine parameters?

A

• N2. (2nd stage intermediate compressor). • N3 (3rd stage HP compressor). • FF (Fuel Flow). • Oil temperatures & pressures. • Engine vibration.

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3
Q

What pilot actions would cause automatic display of the secondary engine parameters?

A

• Fuel control switch moved to cutoff in FLT. • Engine fire switch pulled.

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4
Q

How is the EGT maximum continuous limit indicated?

A

Indicated by an amber band.

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5
Q

When are EGT indications inhibited from changing to amber?

A

During T/O & GA, 5 minutes (10 minutes W/ engine failure).

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6
Q

What does the EGT redline represent?

A

Max. T/O limit.

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7
Q

After an exceedance, how can the red box be removed from EICAS?

A

By pushing the cancel/recall switch on the DSP.

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8
Q

Which two parameters reverse their colours when abnormal?

A

• (Low) oil quantity. • (High) engine vibration. Both change to black text on white background.

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9
Q

How is maximum EPR indicated?

A

Amber line at the top of the EPR dial.

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10
Q

What are the parameters for setting thrust in the normal and alternate modes?

A

• Normal: EEC uses EPR (N1 for 773ER). • ALTN mode: EEC uses N1.

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11
Q

How can maximum rated thrust be obtained?

A

By moving thrust levers to full FWD position (AVBL any phase of FLT).

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12
Q

What the two types of alternate mode?

A
  • Soft (when EEC automatically switches an engine to ALTN mode and the EEC mode switch remains in NORM)
  • Hard (when ALTN is manually selected on an EEC mode switch).
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13
Q

Which type of alternate mode is manually selected?

A

Hard ALTN mode.

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14
Q

How is the autothrottle affected by alternate mode?

A

Autothrottle remain engaged in hard & soft ALTN mode.

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15
Q

When is maximum rated thrust achieved in alternate mode?

A

Max rated thrust reached at a thrust lever position < full FWD (thrust protection not provided).

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16
Q

What protections are available in alternate mode?

A

N1 & N2 red line (overspeed) protection

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17
Q

How does the EEC protect against rotor overspeed?

A

EEC commands reduced FF when approaching overspeed.

18
Q

Why is approach idle selected with FLAPS 25

A

Approach idle decreases acceleration time for a GA.

19
Q

During autostart, what do the fuel control switches control?

A

Moving the fuel control switch to run (during autostart) opens the spar fuel valve.

20
Q

At what N3 RPM does starter cutout occur?

A

50%. Start selector releases to NORM position.

21
Q

When does the EGT maximum start limit red line disappear?

A

After the engine has stabilised at idle.

22
Q

Which fuel valve is operated by moving the fuel control switch to RUN?

A

• During autostart: Spar fuel valve. • Manual start: Spare & engine fuel valve.

23
Q

What two parameters are not monitored by autostart?

A

Oil pressure & temperature.

24
Q

After an aborted ground start, at what EGT will a re-­‐attempt be performed?

A

< 100oC.

25
Q

How many times will autostart attempt a ground start?

A

2

26
Q

For which events will autostart not attempt to re-­‐start?

A

• No N1 rotation. • Low starter air pressure. • Starter shaft failed condition. • Starter duty cycle timer expires. • Start aborted ABV starter cutout speed.

27
Q

After an aborted flight start, at what EGT will a re-­‐attempt be performed?

A

200oC.

28
Q

During a manual start, when are fuel and ignition introduced?

A

As soon as the fuel control switch is positioned to run.

29
Q

When is a crossbleed start indication displayed next to the N3 indication?

A

If airspeed < airspeed recommended for windmilling start.

30
Q

In flight, how many attempts will the autostart perform?

A

In flight, autostart makes continuous start attempts (until engine either starts or the pilot aborts the start attempt by positioning the fuel control switch to cutoff).

31
Q

How many ignitors are used for in flight starting?

A

Both of the 2 ignitors.

32
Q

When is the auto-­‐relight function activated?

A

When engine is at or BLW idle W/ fuel control switch in run.

33
Q

What are the limitations for engine oil quantity?

A

• No maximum quantity limit. • There is a low oil quantity limit (causes automatic display of secondary engine display W/ black numbers on white background).

34
Q

How are the fan reversers activated?

A

Hydraulically (L hydraulic system powers L reverser, R hydraulic system power R reverser).

35
Q

When can maximum reverse thrust be achieved?

A

Firstly, reverse thrust can only be used on the GND W/ engines running (EEC inhibits reverser isolation valve). Max. reverse thrust can be achieved when reverser fully deployed & interlock releases (allowing reverse thrust levers to be raised to max. reverse thrust position).

36
Q

What does a BB vibration level indicate?

A

Indicates that the vibration monitoring system cannot determine the source (N1, N2 or N3). BB (broadband) displayed for affected engine. BB is the average vibration detected.

37
Q

What is the limitation for engine vibration?

A

No certified vibration limit (but high vibration levels displayed in secondary engine parameters).

38
Q

Which rotor viration is most likely to caust tactile vibration ?

A

N1 (low pressure fan).

39
Q

When will the ENG FAIL message appear on the PFD?

A

If actual thrust < commanded thrust during T/O between 65 & 6kts BLW V1.

40
Q

Which EICAS message indicates that actual thrust is significantly less than the commanded thrust?

A

ENG THRUST L or ENG THRUST R

B777 Powerplant (1 decks)

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