Engine Flashcards
PW220 engine description
Twin-spool, low-bypass, high-response turbofan jet engine
thrust to weight ratio block 25/32
Mil - 14,000 lbs 54:1
AB - 25,000 lbs 96:1
Major engine components
CIVVs 3 stage fan 10-stage axial flow compressor combustion chamber compressor and fan turbines MFC AB Engine Gearbox DEEC
CIVVS function
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
5 basic engine modules
Inlet Fan, core engine, fan drive turbine, AB and Nozzle, engine-mounted gearbox
Inlet Fan
3 stage compressor, CIVVs, 100% of airflow, 10,000 rpm, 3:1 compression ratio, anti ice system
Anti-ice
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
Core Module
heart of the work: 60% of the air, 10 stage compressor goes to 24:1, combuster, 20stage high pressure turbine
RCVVs
first three stages of the comprssion stator blades function like CIVVs, programed by DEEC in PRI, hydromechanically controlled by MFC in SEC
start bleed strap located at the ____ stage function:
7th stage ; vents pressure during start
Combustion chamber had ___ fuel injectors ___ spark plug igniters that operate continuously when throttle in operating range ___% and above
16 fuel injectors, 2 spark plug igniters, >12% rpm
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
inlet fan ; 7 thermocouples
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
2 igniters ; 3 seconds ; 3 attempts by DEEC if left in AB
The AB _____ _____ probe prevents AB cancellation contrail by venting fuel into gas stream
Signature elimination probe
Operating in SEC, the nozzle is open/closed by exhaust pressure
Closed
the Engine-Mounted Gearbox Moduel includes the:
Tower Shaft, PTO Shaft, ADG, Oil Pump, engine Alternator, and MFP
Engine Alternator produces power when turning >__% rpm and has three functions:
12% ; provides signal to RPM gauge, powers DEEC, and provides ignition to core engine and igniter plugs
What powers the ADG?
PTO Shaft
when operating in SEC, the RCVVs are _______
positioned by hydromechanical control in the MFC
In SEC, the _____ is not in control and the ______ is - therfore these dont work:
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
DEEC switches to SEC when:
engine overspeed or overtemperature, alternator fails, engine parameter limit exceeded, SEC selected
oil pressure does not register on indicator until ______ or _____ is on-line
main or stby generator is online
the HYD/OIL PRESS light must stay on until _____ or else you _____ the start
25% or Abort the start
____ pints of oil; if pressure does not increase when engine goes from idle to mil that means ________
28 pints
50% of the usable oil is gone
13th stage ____-pressure bleed air functions:
runs EPU Drives ABFP drives nacelle ejectors provides anti-ice protection runs CENC
anti-ice is required when OAT< ____ degrees with _______ on the taxi area
45 degrees ; standing water on taxi area
Anti-ice activates automatically if _________ power is lost
emergency dc bus no.2
the JFS receives electrical power from the ______
battery
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
25% (JFS Maximum) 50% (JFS shuts down automatically) 17 seconds (spooldown)
If start is aborted, wait ___ minute before reattempt
if 4 minutes of JFS used, shutdown and cool for ___ minutes
1 minute
cool for 5 minutes
if hot start occures, motor engine with throttle _____ until FTIT is
OFF, until <200 degrees C
for airstart, if engine runs satisfactorily above 60%, the JFS is limited to ____ minutes and must be ________
3 minutes
shutdown manually
pilot can take “snapshot” of 10 seconds but placing _____ switch to _____ ran by the Engine Diagnostic Unit
AB RESET switch to ENG DATA
two BIT Balls should show _____ during preflight
black
HYD/OIL PRESS light illuminates when _____% of system’s usable oil has been lost
75-80%
initial JFS rotation power is provided by the ______
JFS/Brake accumulator
