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Wright Aviation Services LLC Presents Piper Meridian Systems Training Program Propeller System ©2010-2011-Wright Aviation Services, LLC All rights reserved.

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Presentation on theme: "Wright Aviation Services LLC Presents Piper Meridian Systems Training Program Propeller System ©2010-2011-Wright Aviation Services, LLC All rights reserved."— Presentation transcript:

1 Wright Aviation Services LLC Presents Piper Meridian Systems Training Program Propeller System © Wright Aviation Services, LLC All rights reserved 1/10/111 Click Mouse to Advance Wright Aviation Services

2 Meridian – PA46-500TP Propeller 1/10/112 Click Mouse to Advance Wright Aviation Services

3 Meridian – PA46-500TP Propeller Hartzell ( HC E4N-3Q/ER501K-3.5)  Four Blades  Constant Speed  All Aluminum  Electrically Heated  Full Feathering  Reversible System Includes  Turbine Driven  Reduction Gearbox  Hydraulic Governor  Overspeed Governor  Hub Assembly 1/10/113 Click Mouse to Advance Wright Aviation Services

4 Meridian – PA46-500TP Propeller Pitch Limits  Low Pitch ° ±0.1°  Max Reverse ° ±0.5°  Feather ° ±0.5 Diameter  81.5 minimum  82.5 maximum 1/10/114 Click Mouse to Advance Wright Aviation Services

5 Meridian – PA46-500TP Propeller Operating Modes  Normal  Beta  Reverse Governing System  Primary Governor  Spring  Counterweights  Oil Pressure  Fuel Pressure  Overspeed Governor  Spring  Counterweights  Oil Pressure 1/10/115 Click Mouse to Advance Wright Aviation Services

6 Meridian – PA46-500TP Propeller Primary Governor uses a combination of spring & counterweights offset by oil pressure to regulate propeller RPMs (Np) to The spring & counterweight act to increase propeller pitch while oil pressure acts to decrease the pitch. In a simplified explanation, an oil boost pump incorporated into the primary governor is controlled by the throttle using linkages and fuel pressure. As the throttle moves, changes position and in fuel pressure cause changes in governor oil pressure allowing the pitch of the blades to increase or decrease to maintain a constant speed in normal operations. These linkages are also involved in the low power operations including BETA and Reverse. The counterweights and spring (know as the feather spring) work to cause the blades to go into feather with the loss of oil, pressure at shut down, or when commanded. The overspeed governor manages the top end of the Np range by preventing the prop from exceeding 2000 rpms. It is can be manually activated from the cockpit to provide a secondary means of controlling a runaway prop should there be an uncommanded spike in oil pressure that would reduce blade pitch, increasing Np. Loss of oil pressure, on the other hand, would cause the blades to increase pitch on the way to feathering. 1/10/116 Click Mouse to Advance Wright Aviation Services

7 Meridian – PA46-500TP OnSpeed  2000 rpms A balance is struck between the feather spring & counterweights and the oil pressure on the back of the piston to produce a constant 2000 rpms 1/10/117 Click Mouse to Advance Wright Aviation Services

8 Meridian – PA46-500TP Primary Governor Overspeed Governor 1/10/118 Click Mouse to Advance Wright Aviation Services

9 Meridian – PA46-500TP Over Speed  > 2000 rpms To prevent overspeed, this governor releaves pressure to guard against blade pitch reductions which could result in Np exceedances. In a potential overspeed condition the feather spring & counterweights act to increase pitch by releasing oil pressure to maintain a constant 2000 rpms. A electrically actuated valve provides a manually over ride capability from the cockpit. 1/10/119 Click Mouse to Advance Wright Aviation Services

10 Meridian – PA46-500TP Underspeed  < 2000 rpms Any reduction in RPMs results in reduced centrifical force on the counterweights allowing the oil pressure to overcome the feather spring, reducing the blade pitch until equalibrium is achieved. 1/10/1110 Click Mouse to Advance Wright Aviation Services

11 Meridian – PA46-500TP Overspeed Governor The in the event of an uncontrolled overspeed condition, the overspeed governor can be manually activated, reducing oil pressure into the prop hub causing the blades to increase pitch and control rpms. Testing of this system is conducted during the before take off portion of the normal procedures. 1/10/1111 Click Mouse to Advance Wright Aviation Services

12 Meridian – PA46-500TP Review Hartzell ( HC E4N-3Q/ER501K-3.5)  Four Blades  Constant Speed  Full Feathering  Reversable Speed  2000 rpms Diameter  81.5 minimum  82.5 maximum Governors  Primary  Overspeed 1/10/1112 Click Mouse to Advance Wright Aviation Services

13 Meridian Propeller THE END 1/10/1113 Click Mouse to Advance Wright Aviation Services

14 Presented by Wright Aviation Services LLC Scottsdale/Phoenix AZ Copyright 2010/2011 – Wright Aviation Services All rights reserved Website: Phone: /10/1114 Click Mouse to Advance Wright Aviation Services


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