Engine Flashcards by rob harris

Describe the 787 Engines

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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Where is the Engine Accessory gear box

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What is on the Accessory gear box

FWD

heat exchanger
HYD pump
lube and scavange pump
PMA

AFT

Starter Gen
fuel pump
FMU
flow split valve

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How is Reverse thrust provided

Cascading vane system

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

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What is the EEC

What does it do?

Electric Engine Controller

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

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What does the Fuel Cutoff switch do

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

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When is the Engine Fire Switch automattically unlocked

no power on the aircraft

fuel control switch is in CUTOFF

A Fire is Detected

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What happens when you pull a Engine Fire Switch

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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What does the START switch do

opens the Spar Fuel Valve

Starter motor energizes

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When does the In Flight Start envelope display on the EICAS

Fire Switch not pulled out

and

Fuel control in cut off

Engine is not running in flight

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What does X Start below N2 on the engine display mean

altitude or airspeed is below outside the displayed windmilling envelope

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What is the EGT inhibit times and where does this occur

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

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

Fuel Control switch - CUTOFF

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What do the starter motors drive

the N2 via the accessory gear box

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What are the sources of power for eng start

Ext
Engine
APU

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What is the preferred method of starting the engines

Simultaneous

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

Start the right engine first

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On the ground how many Auto start attempt will be made

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What is eng roll back

Sub idle stall

N2 falls below Idle

What does the EEC do when a Flameout is detected

Dual ignitors

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

Spar and Engine Fuel Valves close

What is the sequence of travel of fuel to the eng

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

Where is Fuel Flow from the ED taken

passing through the Engine fuel valve

right before the eng

What drives the Eng Oil system

N2 power

Engine Acessory Gear box

Where is oil temp and press taken

prior to oil entering the eng

What is engine oil "gulping"

During the start sequence oil quantity may drop several qrts

Is there a minimum Oil QTY in flight

Which device provides control over thrust reverse operation

EEC

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

Autothrottles disengage Speed brakes Deploy

When in EEC Alternate Mode what do you have to remember

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

What does EICAS - ENG RPM LIMITED R mean

EEC has recognized a N2 at the red line limit | it reduces fuel flow to control the overspeed

What are the Idles set by EEC

Min idle Icing Idle Approach idle - Flap > 25, or Gear Down

What are the Idles set by EEC

Min idle EAI -Icing Idle Approach idle - Flap > 25, or Gear Down

What is Approach idle

decreases acceleration time for Go-Around

When is EAI selected

When eng anti ice is on

What is thrust ramping

EEC slowly increases thrust to protect fan blades in high wind situations. Max thrust available at 65 kts

What is thrust control malfunction Accommodation

protection against thrust asymmetry conditions on the ground for landing on ground at idle if not decelerating normally.

What is TAP Thrust asymmerty protection

protection against asymmetric thrust during T/O of GA | allows for a decrease in approach speeds at lower WTs

How does TAP help with OEI operations

reduces thrust on operating eng to allow sufficient rudder control (T/O decreases thrust if below V2 GA decreases thrust if below Vref)

How can TAP reducing thrust if below V2 or Vref help

the thrust asymmetry creates more drag than the thrust adds resulting in a high climb gradient

What is the TBV Transient Bleed Valve

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

Where is eng vibration detected

N1 or N2 (will say on EICAS desplay) BB - Broad band Vibration gives an average (primarily for Rotor imbalance)

What is the limit of vibration

4 units

When do you get a time critical WARNING Eng Fail

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

Which spool are you more likely to feel a tactile vibration