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C208
Cessna 208
| Question | Answer |
|---|---|
| Describe the Engine | PT6-114A Free turbine, Reverse flow, Two independent turbines: One stage drives the compressor turbine One stage drives the power turbine Single exhaust |
| Describe the compressor section | Three axial stages and one centrifugal stage |
| Shaft Horsepower | 675 |
| How does the engine work | Air enters through the air intake, through annular plenum to compressor section, to combustion chamber where fuel and spark is added, through compressor turbine and power turbine, then out through exhaust port |
| Engine Major Sections | Air Intake Compressor Combustor Turbine Reduction Gear Exhaust Accessory Drive |
| Air Inlet | Inlet air enters the rear of the engine through annular plenum where it is directed forward to the compressor |
| Compressor | The compressor consists of three axial stages and a single centrifugal stage assembled as an integral unit |
| Centrifugal Stage | The rotating compressor blades and impeller add energy to the air passing through them by increasing its velocity; converting velocity into pressure |
| Combustion Chamber | Allows entry of compressed air where fuel and spark is added |
| Fuel Nozzles | 14 Total: 10 Primary @ 16% Ng 4 Secondary @ 30-35% Ng |
| Igniters | 2 |
| Hot Section | The resultant hot gases expand and pass through the compressor and the power turbines |
| Compressor turbine | Drives compressor section |
| Power turbine | Drives reduction gear which turns propeller |
| Reduction gearbox | Embodies an intergral torquemeter gauge to provide an accurate indication of engine power |
| Exhaust | The exhaust gases from the power turbine are directed through an annular plenum to atmosphere via a single exhaust port |
| Engine controls | Power lever - controls engine power Emergency power lever - governs fuel supply if FCU failure Propeller control lever - controls propeller governor Fuel condition lever - CUTOFF, LOW 52% Ng, High 65% Ng |
| Engine instruments | Torque Prop RPM ITT Ng Oil Pressure Oil Temperature |
| Torque range | 0-1,865 |
| Prop RPM range | Green arc - 1,600-1,900 |
| ITT range | Green arc - 100 to 740 degrees celsius Redline - 805 degrees celsius Max Start Temp - 1,090 degrees for 2 seconds |
| Ng % RPM range | Green arc - 52 to 101.6 |
| Oil Pressure | Minimum Redline - 40 psi Cautionary Yellow Arc - 40 to 85 psi Normal Green Arc - 85 to 105 psi Maximum Redline - 105 psi |
| Oil Temperature | Minimum Redline -40 degrees celsius Cautionary Yellow Arc -40 to 10 degrees celsius Normal Green Arc - 10 to 99 degrees celsius Transient Yellow Arc - 99 to 104 degrees celsius Maximum Redline - 104 degrees celsius |
| Minimum Ng for start | 16% |
Created by:
MarioJPerez
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