Turbine Systems Flashcards
When adjusting your FCU, what will be your final direction to turn?
Increase direction
An aircraft should be facing into the wind when trimming an engine. However, if the velocity of the wind blowing into the intake is excessive, it is likely to cause a…
False high compression and turbine discharge pressure
The type of oil pumps most commonly used on turbine engines are classified as what?
Positive displacement
After making a welded repair to a pressurized-type turbine engine oil tank, the tank should be pressure checked to…
5psi above normal pressure
Anti-ice air commonly comes from the turbine section? (True or False)
False
What does ACC stand for?
Active Clearance Control
Two most common types of exhaust noise suppression are…
Corrugated perimeter
And
Tube type
Operating thrust reversers at what speed can cause FOD?
Slow speed
What happens to Static Pressure of supersonic exhaust gases through a divergent duct?
Pressure decreases and velocity increases
What are the most common types of Jet Fuel?
Jet A & Jet A1
Which filter has the highest degree of filtering: Scavenge, Low pressure, High pressure…
High pressure
What causes the fuel divider valve to open?
Fuel pressure
In a supervisory electronic engine control (EEC) system, when there’s any fault in the EEC what will it do?
It reverts to hydromechanical
What are the two principle sections of the Fuel Control Unit (FCU)?
Computing and Metering
What will the oil do when the engine is cold in reference to the fuel oil cooler?
It will bypass the cooler
What is the primary purpose of the fuel/oil cooler?
To cool the oil
On a test stand, what type of inlet is used on a turbine engine?
Bellmouth
In axial flow compressor, bleed air is used to cool the inlet guide vanes… (True or False)
False
What are the insulating blankets around the hot section made out of?
Aluminum, Fiberglass, or Stainless steel
Is rearward thrust equal to forward thrust?
No (35-50%)
What is the purpose of lining the inlet of turbo fan with honeycomb?
Noise suppression
Are the generators on aircraft and APU interchangeable?
Yes
What in fuel allows microbial growth?
Water
What is the purpose of the fuel flow divider in a turbine engine duplex fuel nozzle?
Primary and secondary fuel flow
What do boost pumps in a fuel system do?
Primes engine driven fuel pump
What is not a variable of the FCU?
Humidity
When the throttle lever increases thrust, what does the fuel flow do?
Increases
Why is it important to service oil within 30 minutes of shut down?
To prevent over filling
What is the purpose of the dwell chamber?
To separate out the oil
What do the blow-in doors do?
Allow more air in the inlet
Where is the oil cooler located in reference to a “hot tank”?
Pressure line
Two most common sources of power for thrust reversers are?
Pneumatic and Hydraulic
Which has more heat energy, Kerosene or AVGAS?
Kerosene
What are the perimeters during engine trim settings?
Idle and max power
When an emergency alternative fuel is used, what should be adjusted?
Specific gravity
What does the fuel/oil cooler do in reference to fuel?
Warms fuel
The purpose of an engine/inlet anti-ice system is primary to…
Prevent the formation of ice
Aircraft uses ram air pressure in flight to cool engines internals around cowling, how is this done on the ground?
Low pressure air around the exhaust (Cowl flaps)
What are the most common types of thrust reversers?
Mechanical and Aerodynamic
What does the fuel tank boost pump do in reference to engine driven pump?
Primes engine driven pump
What is the unit that lies at the heart of the EEC?
Hydromechanical fuel controller
Oil pumped to main bearing is used for…
Cooling and lubrication
Fix orifice nozzles used in turbine engine lube systems do what?
Send right amount of oil to each bearing
What does the pneumatic system run off of?
Bleed air
