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Boeing 787 > Engines (GE) > Flashcards

Engines (GE) Flashcards

1
Q

What parameters are monitored during autostart?

A

EGT, N2 andand other parameters until engine reaches idle speed.

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2
Q

Can the engines be manually started?

A

No

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3
Q

For what conditions will the autostart NOT attempt a second start?

A
  • Loss of both starters
  • No N1 rotation
  • No oil pressure rise
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3
Q

How many start attempts are made for an in flight start?

A

No limit in the air.

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4
Q

How many attempts with the autostart will the system make on the ground?

A

3 start attempts.

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5
Q

What two modes does the EEC provide?

A

Normal & Alternate

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6
Q

What protection is lost when the EEC is in alternate mode?

A

Thrust protection. Thrust overboost can occur with the thrust levers in the full forward position.

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7
Q

When do the EEC’s set approach idle in flight?

A
  • Flaps commanded to 25 or greater, or

- Landing gear selected down

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8
Q

What mark on the N2 gauge indicates the RPM where the engine can maintain self-sustained running operation?

A

Green mark, Idle target indication

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9
Q

For how long is the “RUNNING” indication displayed?

A

30 seconds after engine reaches idle.

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10
Q

What condition creates the AUTORELIGHT mode?

A

When the EEC is in auto-relight mode.

Activated whenever an engine is at or below idle with the FUEL CONTROL switch in RUN.

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11
Q

During an in-flight start, with speed below that for a windmilling start, describe the indication that is displayed if a starter assist is required?

A

“X-START” displayed in magenta below N2 if airspeed is below that for a windmilling start.

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12
Q

What does the fuel control switch control?

A

Fuel control switch controls the spar fuel valve.

It also arms the engine fuel valve and igniters for the EEC to operate.

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13
Q

If the overspeed protection fails, what will the EEC’s command the engines to do?

A

EEC will command fuel shut off to that engine.

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14
Q

What alert is displayed on the HUD(green) and PFD(red) if actual thrust is less than commanded?
What is the airspeed range for this alert to be active?

A

“ENG FAIL”
Between 65kts and 6kts prior to V1.
Also master warning and voice “Engine Fail”

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15
Q

What environmental factors causes thrust ramping to activate?

A

Crosswind, especially during high altitude and high ambient temperatures that require maximum thrust settings.

16
Q

With thrust ramping active, what is the latest airspeed maximum takeoff thrust will be set?

A

65 KIAS

17
Q

What protection does Thrust Control Malfunction Accommodation provide for?

A

Idle thrust asymmetry conditions on the ground.

18
Q

What system provides Thrust Control Malfunction Accommodation, and how does it work?

A

Provided by the EEC. Commands shutdown of affected engine when:

  • Airplane on the ground, and
  • Thrust lever is at idle
  • Engine above idle speed and not decelerating normally.
19
Q

Is TAP available available in both EEC modes?

A

Thrust Asymmetry Protection available in EEC normal or alternate modes.

20
Q

With TAP active, will there be a decrease in climb performance?

A

No. Any decreased climb performance will be due to mismanaged speed, not TAP.

21
Q

When TAP is active, what indication will be displayed on EICAS?

A

As TAP reduces thrust, the maximum and commanded N1 tics move down to the reduced TAP thrust value. The reference/target N1 and thrust levers do NOT move.

22
Q

Where is the reverser indication displayed?

What does amber and green REV indicate?

A

Thrust reverser indication displayed over N1 gauges on EICAS.
Amber REV indicates reverser in transit, green REV indicates reverser deployed.

23
Q

What is the indication of TAP inoperative?

A

EICAS “THRUST ASYM PROT”

24
Q

How is the reference N1 displayed?

A

Displayed with a green/magenta chevron symbol on the N1 gauge.

25
Q

How and where is the thrust reference mode displayed?

A

Displayed in green above and between N1 gauges on EICAS display.

26
Q

Why should the thrust levers be moved to the mid positions before selecting Alternate Mode on the EEC?

A

To prevent overboost. Alternate mode will provide same or higher thrust for the same thrust lever position.

27
Q

What powers the thrust reversers?

A

Left and right hydraulic systems.

28
Q

What indication is there on EICAS of EEC alternate mode?

A

EICAS “ENG EEC MODE L/R”

29
Q

How can an exceeded EGT indication be recalled?

A

By pressing the CNC/RCL switch.

30
Q

Which engine is installed and what is the thrust rating?

A

GEnx-1B64

63.800lbs thrust

31
Q

When is the EGT max continuous limit indication inhibited and for how long?

A

Inhibited on takeoff and go-around.

5 minute inhibit, 10 minutes for S/E operations.

32
Q

What is the indication of an N1, N2 or EGT exceedance?

A

If indication reaches red line operating limit,
digital readout, dial, box & pointer changes to red.
The box will remain red after back within operating limits. Can be cancelled/recalled.

33
Q

What powers the EEC’s?

A

During engine start, airplane power. After engine start, PMA’s.

34
Q

What is the indication when thrust protection is active?

A

EICAS “ENG RPM LIMITED”

35
Q

What is the Transient Bleed System?

A

System which unloads the compressor during engine acceleration to increase engine stall margin.

36
Q

What effect does a closed engine TBV have on thrust reverser operation?

A

Thrust reverser inhibited with TBV closed. If already deployed, limited to reverse idle. EICAS “ENG REV LIMITED”.

37
Q

When is the engine vibration indicated in reverse video?

A

When above 4.0

38
Q

What conditions will the autostart system try to correct for?

A
  • Hot start
  • Hung start
  • Wet start
  • Compressor stall
  • High residual EGT
  • Loss of one starter
  • Start time exceeds starter duty cycle time

Boeing 787 (18 decks)

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