Powerplant Flashcards
What are the engines used in the MC-12?
The PT6A-60A
Describe the PT6A-60A
1050 SHP, Free Turbine, Reverse Flow engines.
The power turbines are connected through planetary reduction gearing to a flanged propeller shaft.
Power plants may be divided into _ major sections.
What are they?
Power plants may be divided into three major sections:
Compressor Section
Combustion Section
Power Section
The engines are each rated at ____ horsepower.
1050 SHP
The engines are each rated at 1050 horsepower.
If you are unable to develop power but ITT and N1 continue to increase, what is likely the problem?
Bleed Valve is not closing
What components are located on the Accessory Gear Box?
F – R – O – S – T
Fuel Pumps / Fuel Control Refrigerant (right engine only) Oil Pumps / Scavenge Starter Generators Tachometer (N1)
What are the four stages of compression on the PT6A-60 engine?
Three axial and one centrifugal
What is the device that compensates for excess air flow at low N1 settings by bleeding axial compressed air to reduce back pressure in the engine compressor section?
Compressor Bleed Valve
What is 25% of compressed air is used for?
Combustion
75% Cooling
How many igniter plugs are used to light the fuel/air mixture when the engine is started?
Two. However, only one is required.
What are the components of the reduction gear box?
T – Tachometer (N2)
O – Overspeed Governor
P – Primary Governor
The Reduction Gearbox has a two-stage gear box reducing the RPM from 30,000rpm to 1700rpm
Where is the chip detector is located?
Bottom of Reduction
The oil system is responsible for what?
Lubricating
Cooling
Heating
Adjusting Prop Pitch
What action should be taken inflight with oil pressure reading 80psi?
Limit torque to 62% with oil pressure between 60-90psi.
If oil pressure drops to 57psi what are the indications on the MFD and what action should be taken?
EIS oil display will be displayed in red (<60) and consider performing ENGINE SHUTDOWN IN FLIGHT.
