Engine Flashcards

1
Q

PW220 engine description

A

Twin-spool, low-bypass, high-response turbofan jet engine

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2
Q

thrust to weight ratio block 25/32

A

Mil - 14,000 lbs 54:1

AB - 25,000 lbs 96:1

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3
Q

Major engine components

A
CIVVs
3 stage fan
10-stage axial flow compressor
combustion chamber
compressor and fan turbines
MFC
AB
Engine Gearbox
DEEC
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4
Q

CIVVS function

A

control AOA of all air entering the fan to prevent stalls, controlled by DEEC and powered by fuel pressure, automatic in PRI, fixed position in SEC

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5
Q

5 basic engine modules

A

Inlet Fan, core engine, fan drive turbine, AB and Nozzle, engine-mounted gearbox

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6
Q

Inlet Fan

A

3 stage compressor, CIVVs, 100% of airflow, 10,000 rpm, 3:1 compression ratio, anti ice system

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7
Q

Anti-ice

A

from 13th stage hot bleed air, controlled by DEEC and ANTI ICE switch, DEEC prevents anti-ice ops above 30,000’ and when engine inlet/bleed air temps are high

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8
Q

Core Module

A

heart of the work: 60% of the air, 10 stage compressor goes to 24:1, combuster, 20stage high pressure turbine

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9
Q

RCVVs

A

first three stages of the comprssion stator blades function like CIVVs, programed by DEEC in PRI, hydromechanically controlled by MFC in SEC

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10
Q

start bleed strap located at the ____ stage function:

A

7th stage ; vents pressure during start

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11
Q

Combustion chamber had ___ fuel injectors ___ spark plug igniters that operate continuously when throttle in operating range ___% and above

A

16 fuel injectors, 2 spark plug igniters, >12% rpm

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12
Q

Fan drive turbine module located aft of compressor turbine powers the ________ via inner spool, and ____ thermocouples measure engine air temp (FTIT) ; exit air mixes with fan bypass air

A

inlet fan ; 7 thermocouples

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13
Q

AB ignition has ____ separate igniters and activates for up to ___ seconds until light off is detected by the AB light-off detector, or DEEC terminates AB Fuel flow after ___ attempts

A

2 igniters ; 3 seconds ; 3 attempts by DEEC if left in AB

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14
Q

The AB _____ _____ probe prevents AB cancellation contrail by venting fuel into gas stream

A

Signature elimination probe

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15
Q

Operating in SEC, the nozzle is open/closed by exhaust pressure

A

Closed

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16
Q

the Engine-Mounted Gearbox Moduel includes the:

A

Tower Shaft, PTO Shaft, ADG, Oil Pump, engine Alternator, and MFP

17
Q

Engine Alternator produces power when turning >__% rpm and has three functions:

A

12% ; provides signal to RPM gauge, powers DEEC, and provides ignition to core engine and igniter plugs

18
Q

What powers the ADG?

A

PTO Shaft

19
Q

when operating in SEC, the RCVVs are _______

A

positioned by hydromechanical control in the MFC

20
Q

In SEC, the _____ is not in control and the ______ is - therfore these dont work:

A

DEEC is not in control, the hydromechanical MFC is running in secondary mode - CIVVs, fans speed control, AB, nozzle are in a fixed position or inoperable

21
Q

DEEC switches to SEC when:

A

engine overspeed or overtemperature, alternator fails, engine parameter limit exceeded, SEC selected

22
Q

oil pressure does not register on indicator until ______ or _____ is on-line

A

main or stby generator is online

23
Q

the HYD/OIL PRESS light must stay on until _____ or else you _____ the start

A

25% or Abort the start

24
Q

____ pints of oil; if pressure does not increase when engine goes from idle to mil that means ________

A

28 pints

50% of the usable oil is gone

25
Q

13th stage ____-pressure bleed air functions:

A
runs EPU
Drives ABFP
drives nacelle ejectors
provides anti-ice protection
runs CENC
26
Q

anti-ice is required when OAT< ____ degrees with _______ on the taxi area

A

45 degrees ; standing water on taxi area

27
Q

Anti-ice activates automatically if _________ power is lost

A

emergency dc bus no.2

28
Q

the JFS receives electrical power from the ______

A

battery

29
Q

at ____% the JFS starts automatically, and at ____% the run light extinguishes and the JFS switch snaps to OFF and will not reengage for ____seconds for spooldown

A
25% (JFS Maximum)
50% (JFS shuts down automatically)
17 seconds (spooldown)
30
Q

If start is aborted, wait ___ minute before reattempt

if 4 minutes of JFS used, shutdown and cool for ___ minutes

A

1 minute

cool for 5 minutes

31
Q

if hot start occures, motor engine with throttle _____ until FTIT is

A

OFF, until <200 degrees C

32
Q

for airstart, if engine runs satisfactorily above 60%, the JFS is limited to ____ minutes and must be ________

A

3 minutes

shutdown manually

33
Q

pilot can take “snapshot” of 10 seconds but placing _____ switch to _____ ran by the Engine Diagnostic Unit

A

AB RESET switch to ENG DATA

34
Q

two BIT Balls should show _____ during preflight

A

black

35
Q

HYD/OIL PRESS light illuminates when _____% of system’s usable oil has been lost

A

75-80%

36
Q

initial JFS rotation power is provided by the ______

A

JFS/Brake accumulator