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Introduction. Describe how power is controlled with a Constant Speed PropellerDescribe how the speed of the propeller is set and controlledState the limitations on the engine and propellerDescribe the 2 elements of a Constant Speed Propeller UnitDescribe the failure modes of the Constant Speed P
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1. The Constant Speed Propeller
2. Introduction Describe how power is controlled with a Constant Speed Propeller
Describe how the speed of the propeller is set and controlled
State the limitations on the engine and propeller
Describe the 2 elements of a Constant Speed Propeller Unit
Describe the failure modes of the Constant Speed Propeller
3. Objectives State how to control power and engine RPM with a constant speed propeller
State the limitations of RPM and engine power
List the 2 main elements of a Constant Speed Propeller system
Explain how the Pitch Change Mechanism and the Speed Governor work
State the failure modes of the Constant Speed Propeller
4. Engine and Prop Controls
5. Manifold Air Pressure (MAP)
6. Control of Power (Low Power)
7. Control of Power (High Power)
8. Control of RPM (High RPM)
9. Control of RPM (Low RPM)
10. Control Indications
11. MAP Change with Altitude
12. Take –Off and Climb
13. Cruise
14. Limitations The Slingsby Firefly T67M-Mk2
The MAP must not exceed hundreds of RPM +4
i.e. If the RPM is 2300, the max allowed MAP is 27”
The RPM must not exceed 2700.
15. Two Main Elements Speed Governor
Senses speed of the engine
Provides pressurised oil, hydraulic lock or a path to sump for oil to the pitch change mechanism
Pitch Change Mechanism
Changes pitch of the blades depending on the oil pressure from the Speed Governor
16. Speed Governor
17. Speed Governor RPM Control
18. Speed Governor and Pitch Change Mechanism
19. Pitch Change MechanismDecreasing Pitch
20. Pitch Change MechanismHolding Pitch
21. Pitch Change MechanismIncreasing Pitch
22. Failure ModeUnderspeed Underspeed
Caused by excessive pitch
Loss of oil Pressure
Failure of speed governor
Failure of Pitch Change Mechanism
Actions
Check oil pressure
Check MAP above 15” If not open throttle
Exercise RPM through whole range
Refer to checklist
23. Failure ModeOverspeed Overspeed
Caused by excessively fine pitch
Speed Governor failure
Pitch Change Mechanism failure
Actions
Use throttle to keep RPM within limits
Leave RPM control at mid range
Reduce speed 80kts
Refer to failure checklist
24. Summary How power is controlled with a Constant Speed Propeller
How the speed of the propeller is set and controlled
Limitations on the engine and propeller
The 2 elements of a Constant Speed Propeller Unit
The failure modes of the Constant Speed Propeller
25. Questions State how to control power and engine RPM with a constant speed propeller
State the limitations of RPM and engine power
List the 2 main elements of a Constant Speed Propeller system
Explain how the Pitch Change Mechanism and the Speed Governor work
State the failure modes of the Constant Speed Propeller