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Flashcards in Aircraft Systems - Propellers Deck (20)
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1
Q

What type of propellers does the Piper Seminole Have?

A

Hartzell two bladed, controllable Pitch, constant speed, full feathering propellers

2
Q

What does controllable pitch propeller mean?

A

It means that you the pilot can adjust the angle and pitch of the propeller blades for a specific RPM setting.

3
Q

How does a pilot adjust the propellers pitch?

A

There is a blue propeller lever that can be pulled aft or pushed forward. There is oil pressure that is regulated by a prop governor, that drives a piston which in turn moves the blades.

4
Q

What happens when you move the blue propeller controller forward?

A

Oil pressure drives a piston, which moves the propeller blades to a low pitch. A low pitch equals high RPM which is known as an unfeathered position.

5
Q

What happens when the blue prop controller is moved down?

A

The Oil pressure is reduced from the prop governor, which allows a nitrogen charged cylinder, spring, and counterweight to drive blades into a feathered position, high pitch or low rpm setting known as a feathered position

6
Q

What does it mean that our propeller is constant speed?

A

Once the propeller RPM setting is selected by the blue lever, the propeller governor will automatically vary oil pressure to maintain a constant engine RPM

7
Q

How long does it take for our propeller to feather?

A

Approximately 6 seconds

8
Q

How do you feather the prop?

A

Move the propeller controller all the way aft

9
Q

When Feathering a propeller what must be done to the mixture?

A

It must be cut off to avoid power or combustion of the engine

10
Q

What is the lowest RPM setting our propeller will feather?

A

950 RPM

11
Q

How is Pitch controlled in the the aircraft?

A

Pitch is controlled by Oil and Nitrogen.

12
Q

What does the oil pressure in the propeller do?

A

It moves the propeller toward the high RPM setting

13
Q

What does the nitrogen pressure do in the propeller do?

A

Along with a spring the nitrogen pressure puts the propeller in a low RPM or feathered position

14
Q

What does the prop governor do?

A

Maintains selected RPM setting, or changes the propellers angle. It adjusts the oil pressure and nitrogen pressure

15
Q

How long does it take to feather the propeller?

A

It takes, roughly 6 seconds

16
Q

What are the engine controls?

A

The engine controls are the Throttle, Mixture, and Propeller control

17
Q

What does the Throttle control?

A

The Throttle controls the Manifold Pressure. If it is in between 12 and 18 MP, the gear up warning system will go off

18
Q

What is the purpose of the gear up warning system?

A

Warns you if your landing gear is not retracted, in low manifold pressure settings. So you do not land with your gear up.

19
Q

What is the purpose of the Propeller Control?

A

Adjust the blades from either high RPM (low pitch), or Low RPM or feather position (high pitch)

20
Q

What does the mixture control do?

A

Controls the air to fuel ratio.