Powerplant Flashcards
When does engine synchronization occur?
N1–1.5% or N2 –2.5% with the left engine as master.
What is the engine ignition powered by?
System A from AC Essential Bus and System B from the Battery Bus through a static inverter.
What are the FADECs powered by?
The DC electric system below 50% N2 and by a dedicated FADEC PMA alternator above 50% N2.
What is the minimum bleed air pressure for engine start?
45 psi +/-3 psi.
What is the minimum oil temperature for start on the ground?
-40 degrees C-.
The CF34-8C5B1 has a normal thrust rating of ________ pounds. At APR power, this increase to ________.
12,670/13,790
Bypass air from the N1 Fan produces approximately __________of the engine thrust.
80%
Fuel pressure from the fuel metering unit is used by FADEC to operate
The variable geometry guide vanes of the N2 compressor and the Operability Valve
During start, the thrust lever should be moved from shutoff at _________.
20% N2
Starter disengagement should occur at _______.
50% N2
Continuous ignition must be on if:
Takeoff/landing on contaminated runways
- -Moderate or greater turbulence
- -Moderate or greater rainfall
- -Vicinity of TRWs
What will happen if both sources of power to FADEC fail?
The engine will shut down
The two channels of each FADEC will never make a simultaneous input to the engine except _________________.
When an engine overspeed condition is sensed
With an engine failure, FADEC will schedule One engine Out (OEO) power as follows:
APR power if thrust lever is in TOGA detent
MCT power if thrust lever in CLB detent
Proportional increase in the cruise range
Alerting of a pending oil filter bypass or oil chip detection will be presented to the pilot on the EICAS system
FALSE–will be indicated on a panel in the AFT equipment bay.
Gauges are available to alert the pilot to vibration exceedences in both the N1 and N2 sections of each engine.
FALSE–Gauges only for N1–VIB Icon will appear inside the N2 gauge
How many different idle power settings are available from FADEC.
FIVE—Flight Idle, Approach Idle, Landing Idle, Reverse Idle and Ground Idle.
How is engine oil temperature kept under control?
A fuel/oil heat exchanger uses cold fuel to reduce oil temperature. It also warms the fuel to keep it within limits.
In the event of FADEC failure, the other engine FADEC can provide fuel control of both engines
FALSE
One Engine Out (OEO) fuel scheduling from FADEC will occur when the N1 speed difference between the engines exceeds _____.
15%
How will you know that APR power is being scheduled by FADEC?
A green APR icon will appear inside the N1 gauge.
What will selection of the High Power schedule switchlight do?
Set MCT power on both engines. However its use is prohibited by GoJet pilots
FADEC continues to update its power calculation during takeoff up to _____. It locks in this setting until ___________.
65 Kts/400 ft AGL or thrust lever moved from TOGA detent
During a starter assisted engine start, you should not try to engage the air turbine starter if the N2 RPM exceeds ___________.
45%
Engine crossbleed starts are accomplished using ___________.
Bleed air only from the other operating engine.
What occurs during a thrust reverser deployment in flight?
The FADEC will schedule idle thrust on the engine but the thrust lever will not move.
