McCauley Propeller ppt

Question 1

McCauley propeller’s components for pitch change mechanism are lubricated with _____ instead of engine oil.

Answer 1

grease

Question 2

Some models of McCauley are greased with ____ ____ that is permanently sealed in the hub.

Answer 2

dyed oil

Question 3

What indicates if the hub or blades has RED OIL appearance on the surface?

Answer 3

CRACK

Question 4

Both series of MCcauley props are?

Answer 4

Non-feathering and Non-counterweighted

Question 5

Oil pressure is used to increase propeller blade angle and centrifugal twisting force combines with an _____ _____ to rotate the blades to low pitch.

Answer 5

internal spring

Question 6

With this type of system when a higher blade pitch is selected _____ _____ oil is routed to the propeller hub to push against the piston.

Answer 6

high pressure

Question 7

The _____ directs high pressure oil to the propeller hub to increase the propeller blade angle.

Answer 7

governor

Question 8

Most McCauley governors uses ____ _____ to adjust the speeder spring pressure that acts on the flyweights and pilot valve.

Answer 8

control arm

Question 9

For safety purposes, the governor control lever is spring-loaded to the _____ ______ setting.

This way if the propeller control cable breaks the propeller blades automatically return to low pitch which permits the engine to develop its maximum power output

Answer 9

high speed

Question 10

As another safety feature all McCauley governors incorporate a _____-_____ _______ to prevent the engine and propeller from over speeding

Answer 10

high-speed stop

Question 11

How do you adjust the low speed and high speed stops for McCauley props?

Answer 11

adjust the setscrew on the governor head

Question 12

Difference of hartzell constant speed propellers and Hamilton standard constant speed propeller?

Answer 12

HARTZELL = pitch change mechanism found inside the prop head.

HAMILTON = pitch change mechanism is exposed.

Question 13

Hartzell compact propeller uses a combination of _____ _____ and _____ ______ acting on counterweights to increase the angle of the propeller blades and to FEATHER.

Answer 13

air pressure and centrifugal force

Question 14

Hartzell props has a _____ ______ stored in the propeller hub (cylinder head) and a counterweight is mounted to the base of each propeller.

Answer 14

nitrogen discharge

Question 15

Hartzell compact feathering propeller uses hi-pressure nitrogen discharge and a _____ _____ to INCREASE the blade angle and FEATHER the blades

Answer 15

mechanical spring

Question 16

How did the TWO POSITION Hamilton Standard counterweight propeller transformed to Constant speed propeller system?

Answer 16

a FLYWEIGHT GOVERNOR was developed to replace the selector valve

Question 17

The propeller used with the Hamilton-Standard constant-speed system is essentially the same counterweight propeller used as the two position propeller discussed earlier.

However because a counterweight propeller is used _____ _____ provides the force required to decrease blade angle while _____ ______ acting on the counterweights is used to increase the blade angle.

Answer 17

oil pressure, centrifugal force

Question 18

______ eliminates the drag of a windmilling propeller by presenting the smallest blade profile to the oncoming airstream.

Answer 18

feathering

Question 19

The _____ ______ lever in the cockpit typically incorporates an additional position to rotate the propeller blades to a FEATHERED POSITION.

Answer 19

propeller control lever

Question 20

_______ propellers must be used on multi-engine aircraft to reduce propeller drag to a minimum under one or more engine failure condition

Answer 20

Feathering

Question 21

Almost all small feathering propellers use ____ _____ to take the propeller to low (fine) pitch and blade ______ ______ and compressed air to take the blades to high (coarse) pitch.

Answer 21

oil pressure, counterweights springs

Question 22

Since the blades would go to the feather position during shutdown, the _____ lock the propeller in the LOW PITCH position.

Answer 22

latches

Question 23

What happens with the latches in flight?

Answer 23

prevents the blades from feathering, because they are held off their seat by centrifugal force.

Question 24

If the blades were in the feathered position during engine start the engine would be placed under an ______ load during a time when the engine is already subject to wear.

Answer 24

inappropriate

Question 25

On most aircraft, feathering functions are ______ of constant-speed operation. The operator can override a constant-speed system to feather the propeller at anytime. The operator can bring the propeller out of feather and back online at anytime.

Answer 25

independent

Question 26

The ability of the propeller to go into feather relies on the _____ to override the normal operating range When the pilot selects the propeller to feather the ______ overrides the speeder spring and flyweights This action lifts the pilot valve to the feather position and allows all of the oil to drain from the hub and into the engine sump.

Answer 26

governor, governor

Question 27

One method to take the propeller OUT of the feather position the pilot moves the propeller control to ____ _____ (high rpm) and turns the engine over with the _____ until oil pressure builds up enough to take the propeller out of feather and start the engine .

Answer 27

low pitch, starter

Question 28

For the UNFEATHERING accumulator option, the governor is equipped with an _____ ______ oil port and a _____ ______ ______.

Answer 28

high pressure oil port, control check valve

Question 29

When the propeller is in _____ flight configuration, high pressure oil flows from the governor boost pump past the check valve to fill the accumulator.

Answer 29

normal

Question 30

When the pilot moves the propeller control to ______ the check valve control is moved off and the check valve and is seated trapping the oil under pressure in the accumulator.

Answer 30

feather

Question 31

When the propeller control is moved to the ____ _____ (high rpm) the check valve control is moved onto the check valve and oil under pressure is allowed to flow to the propeller hub to move the propeller blades out of feather and into low pitch to allow the engine to start.

Answer 31

low pitch