Know your PT6A - Pratt & Whitney Canada

More documents

Recommendations

Info

Principles of Operation The PT6A engine consists of two main sections, the gas generator section and the power section. The gas generator section compresses and delivers air to the combustion chamber where it is mixed with fuel and ignited. The resulting hot gases turn the compressor turbine which provides the power to run the compressor and the accessory gearbox located at the rear of the engine. The hot gases continue on to the power turbine where the remaining energy is extracted to turn the propeller. Np Tq Nf T5 (ITT) Ng FCU Wf 13
Airflow Air is directed to a compressor consisting of three axial stages (Four axial stages on large PT6A engine models) and one centrifugal stage. Compressed air leaving the compressor passes through diffuser pipes which turn the flow 90 degrees, reduce its speed and direct the air into the combustion chamber. In the annular combustion chamber the air is mixed with fuel and burned. Two igniter plugs are used to light the fuel/air mixture when the engine is started. They are not required to maintain the combustion process and can be shut off once the engine has reached idle speed. The expanding hot gases are directed first through the compressor turbine and then through the power turbine. After passing through the power turbine, the gases are exhausted through ports on each side of the engine. (Some engines are fitted with a single-port exhaust.) The exhaust stubs fitted to the engine are normally directed to utilize the remaining energy of the gases in the form of thrust for additional aircraft propulsion. Two bleed air systems are incorporated in the PT6A engine. Automatic bleed air from the compressor prevents compressor stall during acceleration from low engine speeds or deceleration from high engine speeds. For aircraft use, air may be bled for heating or pressurizing aircraft cabins. Medium PT6A Engine 14
Page 1 and 2: Key NEW OWNER WISDOm YOUR PT6A turb
Page 3 and 4: Know your pt6A turboprop Should you
Page 6 and 7: Disclaimer Disclaimer The informati
Page 8 and 9: Nomenclature Np PPSP PLA POH PT RPM
Page 10 and 11: Know your pt6A turboprop Once we ha
Page 12 and 13: Modularity The design of the PT6A e
Page 16 and 17: Power Train A shaft connects the po
Page 18 and 19: FOD Protection Inertial Separator T
Page 20 and 21: Oil System The PT6A engine has a se
Page 22 and 23: Controls Cockpit Powerplant Control
Page 24 and 25: CONTROLS Propeller Overspeed Govern
Page 26 and 27: Scheduled Maintenance The following
Page 28 and 29: Oil System Inspection and Servicing
Page 30 and 31: Performance Check Over the life of
Page 32 and 33: Engine Washing External Engine Wash
Page 34 and 35: Hot Section Inspection A Hot Sectio
Page 36 and 37: Cycle Counting Certain rotating com
Page 38 and 39: Engine Condition Trend Monitoring®
Page 40 and 41: Recommended PT6A Engine Power Manag
Page 48: P&WC Customer FIRST Centre Global C

Know your PT6A - Pratt & Whitney Canada

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?