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Boeing 787 > Engines (RR) > Flashcards

Engines (RR) Flashcards

1
Q

What parameters are monitored during autostart?

A

EGT, N2 and N3 RPM and 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

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

2 start attempts.

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5
Q

What two modes does the EEC provide?

A

Normal and 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

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

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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 and an overspeed condition persists, 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 protection does Thrust Control Malfunction Accommodation provide for?

A

Idle thrust asymmetry conditions on the ground.

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16
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.
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17
Q

Is TAP available available in both EEC modes?

A

Thrust Asymmetry Protection available in EEC normal or alternate modes.
Flight controls must be in normal mode.

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18
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.

19
Q

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

A

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

20
Q

Where is the reverser indication displayed?

What does amber and green REV indicate?

A

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

21
Q

What is the indication of TAP inoperative?

A

EICAS “THRUST ASYM PROT”

22
Q

How is the reference TPR displayed?

A

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

23
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.

24
Q

What powers the thrust reversers?

A

Left and right hydraulic systems.

25
Q

What indication is there on EICAS of EEC alternate mode?

A

EICAS “ENG EEC MODE L/R”

26
Q

How can an exceeded EGT indication be recalled?

A

By pressing the CNC/RCL switch.

27
Q

Which engine is installed and what is the thrust rating?

A

Trent 1000G - 63.700lbs

Trent 1000J - 74.400lbs

28
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.

29
Q

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

A

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

30
Q

What powers the EEC’s?

A

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

31
Q

What is the indication when overspeed protection is active?

A

EICAS “ENG RPM LIMITED”

32
Q

When is the engine vibration indicated in reverse video?

A

When above 4.0

33
Q

What conditions will the autostart system try to correct for?

A
  • Hot start
  • Hung start
  • Wet start (no EGT rise)
  • Compressor stall
  • Loss of one starter
  • Start time exceeds starter duty cycle time
34
Q

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

A
  • Loss of both starters

- No N1 rotation

35
Q

When do the EEC’s set Ice Crystal Idle in flight?

A
  • OAT between ISA and ISA+29C, and

- Altitude between 5000’ and 35.000’

36
Q

What is the controlling parameter used by the EEC for setting thrust in normal vs. alternate mode?

A

Normal - TPR

Alternate - N1

36
Q

When is soft alternate mode selected automatically by the EEC?

A

When the required signals are not available.

36
Q

Will TPR, reference and target N1, maximum and commanded N1 all be displayed in alternate EEC mode?

A

Only displayed in hard alternate mode. TPR will always be blank in soft or hard alternate modes.

37
Q

What is the significance of EICAS “ENG LIMIT PROT”?

A

Commanded N1 greater than maximum rated thrust.

EEC in alternate mode

38
Q

What is the secondary air system?

A

A system regulating intermediate pressure stage 8 and high pressure stage 3 bleed to provide cooling and sealing airflow to the intermediate pressure turbine.

39
Q

What are the indications of a SASV failed in open position?

A

EICAS “ENG THRUST HIGH”, or

EICAS “ENG SEC AIR VLV”

40
Q

What are the implications of a SASV failed in the open position?

A

Rapidly rising temperatures in the SAS, could result in overheated engine bearings.

41
Q

How are the ignitors powered? Backup power?

A

Aircraft DC power.

Backup power by the standby power system.

Boeing 787 (18 decks)

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