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787 Systems > Engine > Flashcards

Engine Flashcards

1
Q

Describe the 787 Engines

A

GEnx 1B67 or 1B74/75

67,000 74/75,000lbs thrust rating

Dual rotor axial flow turbofans of high compression and bypas ratio

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2
Q

Where is the Engine Accessory gear box

A

N2

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3
Q

What is on the Accessory gear box

A

FWD

heat exchanger
HYD pump
lube and scavange pump
PMA

AFT

Starter Gen
fuel pump
FMU
flow split valve

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4
Q

How is Reverse thrust provided

A

Cascading vane system

provides reversal of only the fan airflow while engines primary airflow continues normally

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5
Q

What is the EEC

What does it do?

A

Electric Engine Controller

monitors the thrust lever position and controls the eng and provides limit protection

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6
Q

What does the Fuel Cutoff switch do

A

Closes the Engine Fuel Valve
removes ignitor power
unlocks Engine Fire Switch

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7
Q

When is the Engine Fire Switch automattically unlocked

A

no power on the aircraft

fuel control switch is in CUTOFF

A Fire is Detected

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8
Q

What happens when you pull a Engine Fire Switch

A 
Arms both Extinguishers
Closes Spar Fuel valve
Closes engine anti ice
Engine Generators off line
Cuts HYD fluid
Cuts power to thrust reversers
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9
Q

What does the START switch do

A

opens the Spar Fuel Valve

Starter motor energizes

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10
Q

When does the In Flight Start envelope display on the EICAS

A

Fire Switch not pulled out

and

Fuel control in cut off

or

Engine is not running in flight

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11
Q

What does X Start below N2 on the engine display mean

A

altitude or airspeed is below outside the displayed windmilling envelope

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12
Q

What is the EGT inhibit times and where does this occur

A

Inhibited from changing amber during takeoff or Go-around for 5 min

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13
Q

What is the only thing that will stop an engine airstart once it has been started

A

Fuel Control switch - CUTOFF

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14
Q

What do the starter motors drive

A

the N2 via the accessory gear box

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15
Q

What are the sources of power for eng start

A

Ext
Engine
APU

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16
Q

What is the preferred method of starting the engines

A

Simultaneous

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17
Q

In order to get the benefit of the AFT EXT AC power for engine starts without APU what has to happen

A

Start the right engine first

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18
Q

On the ground how many Auto start attempt will be made

A

3

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19
Q

What is eng roll back

Sub idle stall

A

N2 falls below Idle

20
Q

What does the EEC do when a Flameout is detected

A

Dual ignitors

21
Q

What valves close when either the Engine Fire switch is pulled or Fuel Control Switch is in CUTOFF

A

Spar and Engine Fuel Valves close

22
Q

What is the sequence of travel of fuel to the eng

A 
Fuel spar
First stage pump
Oil heater
second stage pump
fuel filter
FMU
Eng fuel valve 
engine
23
Q

Where is Fuel Flow from the ED taken

A

passing through the Engine fuel valve

right before the eng

24
Q

What drives the Eng Oil system

A

N2 power

Engine Acessory Gear box

25
Q

Where is oil temp and press taken

A

prior to oil entering the eng

26
Q

What is engine oil “gulping”

A

During the start sequence oil quantity may drop several qrts

27
Q

Is there a minimum Oil QTY in flight

A

no

28
Q

Which device provides control over thrust reverse operation

A

EEC

29
Q

What actions occur when Reverse Thrust is selected for T/O or Ldg

A

Autothrottles disengage

Speed brakes Deploy

30
Q

When in EEC Alternate Mode what do you have to remember

A

Maximum thrust is reached a thrust lever position less than full fwd

31
Q

What does EICAS - ENG RPM LIMITED R mean

A

EEC has recognized a N2 at the red line limit

it reduces fuel flow to control the overspeed

32
Q

What are the Idles set by EEC

A

Min idle

Icing Idle

Approach idle - Flap > 25, or Gear Down

33
Q

What are the Idles set by EEC

A

Min idle

EAI -Icing Idle

Approach idle - Flap > 25, or Gear Down

34
Q

What is Approach idle

A

decreases acceleration time for Go-Around

35
Q

When is EAI selected

A

When eng anti ice is on

36
Q

What is thrust ramping

A

EEC slowly increases thrust to protect fan blades in high wind situations.

Max thrust available at 65 kts

37
Q

What is thrust control malfunction Accommodation

A

protection against thrust asymmetry conditions on the ground for landing

on ground at idle if not decelerating normally.

38
Q

What is TAP

Thrust asymmerty protection

A

protection against asymmetric thrust during T/O of GA

allows for a decrease in approach speeds at lower WTs

39
Q

How does TAP help with OEI operations

A

reduces thrust on operating eng to allow sufficient rudder control

(T/O decreases thrust if below V2
GA decreases thrust if below Vref)

40
Q

How can TAP reducing thrust if below V2 or Vref help

A

the thrust asymmetry creates more drag than the thrust adds

resulting in a high climb gradient

41
Q

What is the TBV

Transient Bleed Valve

A

Unloads the compressor during eng acceleration in order to increase the eng stall margin

42
Q

Where is eng vibration detected

A

N1 or N2 (will say on EICAS desplay)

BB - Broad band Vibration gives an average

(primarily for Rotor imbalance)

43
Q

What is the limit of vibration

A

4 units

44
Q

When do you get a time critical WARNING Eng Fail

A

Actual thrust is less than commanded thrust during T/O with airspeed between 6 - 65 kts

45
Q

Which spool are you more likely to feel a tactile vibration

A

N1

787 Systems (19 decks)

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