Powerplant Flashcards by David Robinson

Battery start Consideration on the ground?

If ignition A is picked by the FADEC, it will not be powered( AC ess bus)….

After 15 seconds FADEC SWITCHES TO ignition B

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Ign A

ign B. what buses….

Ign A…. AC essential bus

Ign B …. Bat bus

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FADEC means?

Full authority digital engine control

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Engine failure detected?

N1 speed less than 15% of the set pwr

Recovers when w/i 13 %

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Armed for TO?

N1 on BOTH engines within 8% of take off N1 reference

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N1 less than 15 % of set pwr on an engine?

Engine failure detected

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Apr armed for g/a?

Appch bit met

Gear down

Or

Flaps greater than 20

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N1 both engines w/i 8% of takeoff N1 ref?

APR armed for T/O

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Operability valve?

Releases excess air pressure

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What provides hydraulics for. Operability Valve and Statir vanes?

Pressurized fuel … Provides hydraulics for operability valve and stator vanes

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Test

DC pwr AND pneumatics needed for start

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FADEC system pwrd by

Abv 50%

Blo 50%

Abv 50%. … Gearbox mounted fadec alternator

Blo 50% … Aircraft electrical system

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What drives the accessory gearbox

N2 Compressor

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accessory gearbox items

3 fluids -engine oil lube pump

         - hydraulic pump
         - engine fuel pump

2 electric-FADEC
-IDGs

1 AIR..- ATS

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How is the operability valve controlled

By the FADEC

Hydraulically actuated by HP fuel

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IGN B … Bus?

DC Battery bus

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Compressor stall prevented in 2 ways?

Operability valve

VG ( fuel adjusts the stator vanes)

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Apr activates when?

Mismatch of 15%

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APR PWR INCREASES?

Toga …. APR

CLIMB … MCT

CRUISE .. Proportional increase

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Apr armed?

Takeoff?

Landing?

Takeoff.. N1 both engines within 8% of reference value

Landing… Appch bit met
Ldg gear down or
Flaps greater 20

( either eng avail)

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Normal takeoff thrust setting

13600

14500 w/apr

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What enables N1 sync

Rt eng. N1 must be within 1.5% of the left engine N1

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N2 synch is enabled when?

Rt engine N2 is within 2.5% of the left engine N2

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FADEC overspeed protection?

N2 greater than 107%

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Starter cut out

50%

Ignition a powered by Ignition b powered by

Ignition A ... AC ESS BUS | Ignition B ... Batt bus

If ignitor fails

After 15 seconds it switches

Cruise power?

Proportional increase

Max power detent??

APR on both engines ALSO GREEN SWITCHLIGHT

APR .. TL's in detent

CLB ...... MCT TOGA... APR

Fuel pressure is used to manipulate what valve to dump excessive air to avoid a compressor stall

Operability valve

Approach bit met for Landing?

Flaps greater than 20 Or Gear down

How many channels does eachFADEC have?

Two channels.. One active and one monitoring

15% split N1 between engines?

Engine failure detected therefore APR

Continuous ignition?

Both igniters on both engines

VG Compressor linkage?

Only the first four stages

Idle?

Different Idle stages for different phases of flight

Engines?

2 general electric CF34 -8C5 13600 thrust 14510 APR

What provides most of thrust

Bypass air

The VG System is controlled by FADEC and positioned by actuators through a

Mechanical linkage High pressure fuel from the engine fuel metering unit hydraulically moves the actuators

The operability valve. Is controlled by

FADEC and hydraulically actuated by high-pressure fuel from the fuel metering unit

Flex power can only be entered when

- Thrust levers are in Idle or shuts off - Wait on wheels for at least one minute - Assumed temperature entered is greater than the actual OAT - Airspeed is less than 65 kts

Assumed temperature can't be cleared by

-Selecting delete on the FMS CDU -if the FMS is not available Select FLX RESET on the EICAS menu page

The starting and ignition systems are controlled by the

FADEC

What is required for starter operation

DC power and pressurized air(pneumatics)

Each independently controlled ignition system consists of

Two ignition exciters into two igniter plugs

Do the ignition systems alternate between A and B with each Successive start?

Yes

What is the start protection function?

On the ground the FADEC prevents engine damage due to either hot or hung starts

Fuel from the collector tanks is supplied to the respective engine fuel pump unit by

A main ejector or an electrical boost pump

What does the fuel oil heat exchanger do

Uses hot engine oil to heat the fuel Uses cold fuel to cool the engine oil

If an inadvertent thrust reverser deployment ....what happens?

FADEC Will schedule idle thrust However the pilot must place the thrust reverser in the idle position 20-20-1 mes

When is the FADEC system powered by the aircraft electrical system?

Until N2 reaches 50% RPM

When is the FADEC system powered by the gearbox mounted alternator

Above 50% N2

Cruise ----- proportional increase CLB-----MCT TOGA---APR

Engine failure detected if

N1 speed decreases below 15% of the "SET" power

When will we see APR displayed in the N1 gauge?

If APR is activated by an engine failure Or When the thrust Lever is set to the max power detent

Going to Max thrust gives?

APR on both engines

N1 synch is enabled when?

Rt N1 must be within 1.5% of the left N1

N2 sync?

The right engine N2 must be within 2.5 % of the left engine N2

Engine overspeed protection is provided when

N2 exceeds 107% Sensed by the FADEC

When the wing anti-ice is selected on

N2 indicators will display a partial white band below the green band IF N2 decreases into the white range, the N2 pointers will turn white

Test ENGINE OVERSPEED warning

Indicates that N1 or N2 has exceeded redline for more than four seconds

What happens when the oil pressure gauges show normal pressure during engine start

The gauges revert to N1 vibration gauges

Overspeed protection when

N2 exceeds 107%

When will the FADEC quit attempting relights?

If three or more overspeed conditions have been detected within 30 seconds

APR armed when?

TKEOFF? N1 of both engines are within 8 percent of the take off N1 value APPROACH? Either engine available, flaps greater than 20° or landing gear down

Engine failure detected when

N1 speed of an engine decreases below 15% of the set power | if failure was due to on an N1 mismatch? The failure signal is cleared when the mismatch becomes less than 13%

Which engine is the master engine regarding synchronization

Left engine is the master engine and the right engine will be slaved to it

N1 sync?

Rt within 1.5% of left

N2 sync?

Rt within 7.5 of left

What is required for starter operation

Pressurized air and DC electrical power

N2 VIB?

Indicated as a VIB icon on the respective N2 gauge

N1 vib gauge?

Displayed after engine start when oil pressure is normal and engines are at Idle

How Is engine oil cooled and combustion fuel heated?

The fuel oil heat exchanger

How many ITT probes?

What controls The operability valve?

Fuel is used to control and actuate the operability bleed valve

N1sections?

Single stage fan rotor Four stage low pressure turbine

How much of the air which passes through the engine is bypass there versus core air?

85% of the air is bypass air 15% is core air

The accessory gearbox is driven by the

Driven by the N2 rotor

The variable geometry system changes the position of which stator vanes?

The first four stages of Statorveins

What also helps provide additional bleed air offload in addition to the variable geometry system?

Operability valve

What actuates the variable geometry compressor linkage?

Fuel

What actuates the operability valve?

Fuel

Does the FADEC have its own power source?

Yes FADEC alternator

FMU fuel metering unit supplies high pressure fuel for actuating?

Operability valve VG inlet guide vanes VG Compressor stater vanes

Thrust reverser limitations during landing 75/60

Max reverse thrust not permitted below 75 kias Idol reverse by 60 kn

Each FADEC has 2 channels..

Alternated on each successive start

Starting sequence?

The starter drives the engine accessory gearbox which in turn drives the engine N2 core section

Where are oil filter impending bypass and chip detector indications provided or seen?

On the engine fault panel in the aft equipment bay

What happens after an engine over speed? (N2 107%)

Overspeed condition is detected Shut off valve closes stopping fuel flow Engine flames out FADEC Detects flame out and turns on ignition N2 decreases below over speed threshold Automatic relight occurs

No more than three over speed conditions within what time.

30 seconds. 22-50

What air is to use before the thrust reverser's?

Bypass air

Both ignition systems are AC?

Yes

When do we move both thrust Levers into the max power detent?

Wind shear recovery CFIT Stall recovery

Thrust reverser system is armed when

Switch selected on Hydraulic pressure available

Thrust reverser deployed in-flight memory item

Affected thrust lever..Confirm and Idle

Flex thrust Can be set?

Thrust levers idle or shut off WOW1 minute Assm’d temp greater thanOAT A/S less than 65 kts

Continuous ignition during flame out?

Yes

Memory Item dual engine failure?

Cont ign

GA mode is armed on appch?

Landing grear down Or Flaps greater than 20