Engine Flashcards

1
Q

Which two engine indications are displayed full time on the Eicas?

A

N1 and EGT

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2
Q

State the start sequence with Autostart on

A

Pull Engine START switch
- arms start valve (start switch illuminates)
- opens engine bleed air valve
Fuel control switch up to RUN
- opens spar fuel valve
- opens engine fuel valve
•(Auto) Initiates start sequence
- eec sequences start valve
- at predetermined N2 EEC opens fuel metering valve
- EEC energizes selected igniter
•At 50% N2
- Start switch releases (starter cutout commanded)
- start valve closes (light out)
- engine bleed valve opens
- ignition cut out

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3
Q

What does (and does not) the EEC monitor during engine start

A

Does:
- EGT and N2 until stable and idle
- Abort for: Hot start, Hung Start, No EGT

Does not:
- oil pressure
- N1 rotation

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4
Q

If first start unsuccessful autostart

A

Purge fuel
Motor 30 sec
Applies fuel and both igniters

If necessary will make 3rd attempt

If fails:
Fuel and ignition cut off
Eng motored 30sec
Start and bleed valves close
EICAS 1,2,3,4 autostart

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5
Q

Start sequence with AUTOSTART off

A

Engine start switch - pull
- opens start valve
- opens engine bleed air valve
Fuel control switch - RUN (N2 to indicator)
- spar fuel valve opens
- engine fuel valve opens
- Selected igniter energizes
50% N2
- automatic starter cut out
- start switch released to IN
- start valve closes
- engine bleed valve closes
- ignition de energizes
- EGT start limit blanks N2 predetermined limit

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6
Q

What two valves close at 50% N2

A

Start valve
Engine Bleed valve

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7
Q

Function of the Auto ignition selector in the SINGLE position

A

EEC alternates igniter 1 and 2 for each ground start
Both igniters for engine flame out recovery

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8
Q

Function of the STBY IGNITION selector in NORM

A

AC power supplies to igniters
AC not powered, Stby system supply’s continuously to all igniters
(In 1 or 2 Stby power supplied continuously to selected igniter

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9
Q

What happens when you turn the CON IGNITION switch ON?

A

Provides continuous ignition to selected igniters in all engines
Memo message CON IGNITION ON
Engine RPM to approach idle

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10
Q

Ignition selected for each engine individually

A

During start: switch pulled and N2 less than 50%
Engine nacelle anti-ice (NAI) on
Engine flame out detected
Trailing edge flaps not up

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11
Q

Ignition selected for all engines simultaneously

A

Trailing edge flaps out of UP
Continuous ignition switch selected on

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12
Q

EGT start limit exceeded color change

A

Red

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13
Q

X-BLD when next to N2 and engine shut down

A

X-BLD air required for start
(Airspeed is two low for windmilling)

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14
Q

Describe the sequence of engines to be started

A

4,1,2,3
Or
4&1, 2&3

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15
Q

Auto start aborts for
And
Does not monitor for

A

Hot start, hung start, no light off (egt rise)

Oil pressure, N1 rotation

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16
Q

How does the EEC abort a start?

A

Autostart allows the EEC control over the fuel and ignition automatically.

17
Q

At what limit does the EEC abort and inflight start through the Autostart system

A

EGT reaching takeoff limit: EEC cuts off and reapply fuel

18
Q

How is engine cooled

A

Oil
(Which is cooled by fuel through a heat exchanger

19
Q

How is the engine thrust reverser actuated!

A

Pneumatically

20
Q

What protects the thrust reversers from deploying inadvertently in flight?

A

Locked in flight

If unlocks and deploys reverser system automatically applies bleed air to stow and lock

21
Q

What is broadband vibration in the airborne vibration monitoring system

How is it displayed?

A

Source of the vibration cannot be determined

Indicated as BB