Engine

Question 1

PW220 engine description

Answer 1

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

Question 2

thrust to weight ratio block 25/32

Answer 2

Mil - 14,000 lbs 54:1

AB - 25,000 lbs 96:1

Question 3

Major engine components

Answer 3

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

Question 4

CIVVS function

Answer 4

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

Question 5

5 basic engine modules

Answer 5

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

Question 6

Inlet Fan

Answer 6

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

Question 7

Anti-ice

Answer 7

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

Question 8

Core Module

Answer 8

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

Question 9

RCVVs

Answer 9

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

Question 10

start bleed strap located at the ____ stage function:

Answer 10

7th stage ; vents pressure during start

Question 11

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

Answer 11

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

Question 12

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

Answer 12

inlet fan ; 7 thermocouples

Question 13

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

Answer 13

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

Question 14

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

Answer 14

Signature elimination probe

Question 15

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

Answer 15

Closed

Question 16

the Engine-Mounted Gearbox Moduel includes the:

Answer 16

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

Question 17

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

Answer 17

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

Question 18

What powers the ADG?

Answer 18

PTO Shaft

Question 19

when operating in SEC, the RCVVs are _______

Answer 19

positioned by hydromechanical control in the MFC

Question 20

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

Answer 20

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

Question 21

DEEC switches to SEC when:

Answer 21

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

Question 22

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

Answer 22

main or stby generator is online

Question 23

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

Answer 23

25% or Abort the start

Question 24

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

Answer 24

28 pints

50% of the usable oil is gone

Question 25

13th stage ____-pressure bleed air functions:

Answer 25

``` runs EPU Drives ABFP drives nacelle ejectors provides anti-ice protection runs CENC ```

Question 26

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

Answer 26

45 degrees ; standing water on taxi area

Question 27

Anti-ice activates automatically if _________ power is lost

Answer 27

emergency dc bus no.2

Question 28

the JFS receives electrical power from the ______

Answer 28

battery

Question 29

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

Answer 29

``` 25% (JFS Maximum) 50% (JFS shuts down automatically) 17 seconds (spooldown) ```

Question 30

If start is aborted, wait ___ minute before reattempt | if 4 minutes of JFS used, shutdown and cool for ___ minutes

Answer 30

1 minute | cool for 5 minutes

Question 31

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

Answer 31

OFF, until <200 degrees C

Question 32

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

Answer 32

3 minutes | shutdown manually

Question 33

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

Answer 33

AB RESET switch to ENG DATA

Question 34

two BIT Balls should show _____ during preflight

Answer 34

black

Question 35

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

Answer 35

75-80%

Question 36

initial JFS rotation power is provided by the ______

Answer 36

JFS/Brake accumulator