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Boeing 777-200 Systems > Engines > Flashcards

Engines Flashcards

1
Q

Engine Nomenclature

A

Roll Royce Trent 892

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2
Q

Engine Description

A
  • Three rotor
  • Axial flow turbofans
  • High compression
  • High bypass ratio
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3
Q

Describe the N1 rotor

A
  • Low pressure compressor section
  • Low pressure turbine section
  • On a common shaft
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4
Q

Describe the N2 rotor

A
  • Intermediate pressure section
  • Intermediate pressure turbine
  • On a common shaft
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5
Q

Describe the N3 rotor

A
  • High pressure compressor section
  • High pressure turbine section
  • On a common shaft
  • Drives the engine accessory gearbox
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6
Q

What are the primary engine indications?

A
  • EPR
  • N1
  • EGT
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7
Q

What are the secondary engine indications?

A
  • N2
  • N3
  • Fuel flow
  • Oil pressure, temperature, quantity
  • Engine vibration
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8
Q

Describe EEC

A
  • Dual channel
  • Has full authority over its respective engine’s operation
  • Uses thrust lever inputs to automatically control forward and reverse thrust
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9
Q

What are the two control modes of the EEC?

A
  • NORM
  • ALTN
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10
Q

How does the EEC set thrust in the NORM mode?

A

By controlling EPR based on thrust lever position

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11
Q

When does the EEC switch to soft alternate mode?

A

Automatically when required signals are not available to operate in the normal mode

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12
Q

How does the EEC set thrust in ALTN mode?

A

By scheduling N1 as a function of thrust lever position

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13
Q

What are the two alternate modes of the EEC?

A
  • Soft
  • Hard
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14
Q

What may happen when hard ALTN is selected?

A

Thrust may change to set the commanded N1

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15
Q

What protection is not provided in the ALTN modes?

A

Thrust protection

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16
Q

What protection is provided by the EEC in both NORM and ALTN modes?

A

N1, N2, N3 redline overspeed protection

17
Q

What does the EEC command if N1, N2, N3 approaches overspeed?

A

Reduced fuel flow

18
Q

What does the FUEL CONTROL and ENGINE FIRE switches control?

A

Fuel spar valve

19
Q

What does the engine’s oil system provide?

A

High pressure oil for cooling and lubricating the main bearings, gears, and the accessory drive unit

20
Q

Where is oil pressure measured?

A

Prior to entering the engine

21
Q

Where is oil temperature measured?

A

After leaving the engine

22
Q

What are the three bleed air sources for starting the engine?

A
  • APU
  • High pressure ground air
  • The other engine, if it’s running
23
Q

How long must the engines be warmed up before applying takeoff power if they have been shut down for up to 1.5 hours?

A

3 minutes

24
Q

How long must the engines be warmed up before applying takeoff power if they have been shut down for over 1.5 hours?

A

5 minutes

25
Q

What happens when the AUTOSTART switch is ON and FUEL CONTROL switch is in the RUN position?

A
  • Spar valve opens
  • Engine fuel valve arms
  • The selected igniter arms
26
Q

What is not monitored by the AUTOSTART system?

A
  • Oil pressure
  • Oil temperature
27
Q

What malfunctions will the AUTOSTART system make a 2nd start attempt for?

A
  • Hot start
  • Hung Start
  • No EGT rise
  • Compressor stall

“ Hot, hung, no, bang”

28
Q

On the ground, what malfunctions will the AUTOSTART system NOT make a 2nd start attempt for?

A
  • Starter shaft fails
  • Insufficient air pressure
  • No N1 rotation
  • Start time exceeds the starter duty cycle
  • Start is aborted above starter cutout speed

“SANDE”

29
Q

What does the EEC activate the auto relight function for?

A
  • Engine flameout protection
  • Rain and hail ingestion
30
Q

When is the auto relight function activated?

A
  • When an engine is at or below idle with the FUEL CONTROL SWITCH set to RUN
  • When excessive rain or hail is ingested
31
Q

When does the EEC disables the auto relight function?

A
  • If engine does not recover and N3 drops below 35%
  • Fuel and ignition are also shut off
32
Q

What are the three EEC Idle Modes?

A
  • Minimum
  • Intermediate
  • Approach
33
Q

When is Minimum Idle Mode commanded by the EEC?

A

During ground operations

34
Q

When is the Intermediate Idle mode commanded by the EEC?

A

When the landing gear is in the DN position

35
Q

When is the Approach Idle Mode commanded by the EEC?

A
  • When flaps are commanded to 25 or greater
  • When engine anti-ice is in use
  • When one hydraulic air-driven demand pump is inoperative with flaps out of the UP position
  • When the opposite engine bleed air valve is closed

Note: Approach Idle decreases acceleration time in the event of a Go-Around

36
Q

What happens when the thrust reverse levers are at the interlock position?

A
  • Autothrottle disengages
  • Auto speed brakes deploy if not previously armed

Boeing 777-200 Systems (21 decks)

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