Powerplant Oral & Practical N Propellers

Front 1

What is meant by a slave Engine with regards to propellers synchronization?

Back 1

The engine in a multi-engine airplane whose RPM follow those set on the master engine.

Front 2

What does the pilot do to change the RPM of an engine equipped with a constant-speed propeller when it is operating within the constant-speed range?

Back 2

Move the propeller pitch control.

To change the speeder spring within the governor which moves the pilot valve.

The pilot valves direct oil in or out of the propeller to change the pitch of the blades.

A changing pitch changes the load on the propeller which changes the RPM.

Front 3

How is ice prevented from forming on the propeller blades?

Back 3

A chemical anti-ice system is used. With a mixture of isopropyl alcohol and ethylene glycol pumped into the slinger ring on the back of the propeller rod hub. The centrifugal forces slings the mixture out along the blades preventing ice from resulting on the Slick surfaces of the blade.

Front 4

How is ice removed from propeller blades?

Back 4

By a Deicing system of electrical heating elements embedded in rubber boots that are bonded on the leading edges of the blades.

Front 5

How can you determine that the electrically heated deicer boots on the propeller blades are working as they should?

Back 5

Observe the ammeter or load meter to see the proper current is flowing and follow the sequence of boot heating by feeling with your hands to see which one is heating, the boots should have similar heat rise in the same length of time.

Front 6

How are propellers on the twin-engine airplane synchronized?

Back 6

The Propeller of the master engine is set to the desired RPM. A signal is sent through the propeller governor to the control box and the stepping motor which adjusts the propeller governor and fuel control of the slave engine causing it to maintain exactly the same RPM as the master engine.

Front 7

Where do you find a list of the lubricants that are approved for use on a constant speed propeller?

Back 7

In the maintenance manual of the propeller.

Front 8

Who, or what facility, is authorized to perform a major repair to a propeller?

Back 8

An FAA approved propeller repair station for that specific propeller.

Front 9

What checks and maintenance is a mechanic with a power plant rating allowed to make on a propeller?

Back 9

Check the track of the propeller blades.

Remove small nicks and scratches from the blades.

Check dynamic balance of the propeller.

Lubricate the propeller.

Front 10

What adjustment can a mechanic with a powerplant rating make to a propeller governor?

Back 10

Adjust the maximum rpm stop.

Front 11

Why do some aircraft engines have a critical range of operation?

Back 11

Because of the resonant frequency problems that can cause excessive vibration at certain range of RPM. Usually marked with the red Arc on the tachometer.

Front 12

What is the difference between a controllable propeller and a constant-speed propeller?

Back 12

The control system, the controllable pitch propeller uses manual operation of valves to control the pitch, and the constant-speed propeller uses a governor to control the valves.

Front 13

Does centrifugal twisting moment on a propeller blade tend to move the blades toward high pitch or towards low pitch?

Back 13

Low pitch (which leads to high RPM)

Front 14

Does the counterweights on a propeller blade tend to move the blades towards high pitch or towards low pitch?

Back 14

High pitch (which leads to low RPM)

Front 15

What is adjusted inside the governor for a constant speed propeller to change the speed at which the propeller is operating?

Back 15

The compression of the speeder spring

Front 16

What is the function of the accumulator used with some McCauley feathering propellers?

Back 16

Stores oil under pressure when the engine is operating normally, this oil is used to help the propeller blades move towards low pitch when the propeller is been unfeathered.

Front 17

What is meant by the beta range of operation of a turboprop propeller?

Back 17

The mode of ground operation, that includes starting, taxing, and ground reverse operations.

Front 18

What is meant by the alpha range of operation of turboprop propeller?

Back 18

This is the flight mode of operation from takeoff to landing.

Front 19

What is done to cause a McCauley propeller to feather?

Back 19

Oil is allowed to drain out of the propeller.

Front 20

What keeps the McCauley feathering propeller from feathering when the engine is shutdown on the ground?

Back 20

A spring-loaded latching mechanism prevents the blades from moving into the feather position when the engine is shutdown on the ground.

Front 21

Should an adjustable pitch propeller be in high pitch or in low pitch for takeoff?

Back 21

Low Pitch or High RPM.

Front 22

What is done to cause a hydromatic propeller to feather

Back 22

High pressure oil is directed into the propeller through the governor.

Front 23

When making a Magneto check on an engine equipped with a constant-speed propeller should the propeller control be in the low pitch or the high pitch position?

Back 23

Low pitch position or high RPM.

Front 24

What can be done to prevent the front cone from bottoming when installing a propeller on a splined shaft?

Back 24

By installing spacers behind the rear cone to move the propeller forward on the shaft.

Front 25

What is the function of the snap ring inside the hub of a propeller that is mounted on the tapered or spline shaft?

Back 25

It allows the propeller to be pulled off the shaft by backing off the retaining nut.

Front 26

Why is a propeller indexed to the engine crankshaft?

Back 26

To produce minimum vibration.

Front 27

What instrument is used to measure the blade angle of a propeller?

Back 27

A Universal propeller protractor

Front 28

Where is the propeller protractor placed to measure the propeller blade angle?

Back 28

At a distance from the center of the propeller hub. The distance is specified in the propeller maintenance manual in terms of propeller blade stations.

Front 29

What is the extent of the repairs a mechanic with a powerplant rating can make to a propeller?

Back 29

A minor repairs or minor alterations.

Front 30

Where can examples of acceptable repairs to aluminum alloy propeller blades be found?

Back 30

AC 43.13-1B Chp 8 Section 4

Front 31

Is it permissible to cold straighten a damaged aluminum alloy propeller blade to facilitate shipping it to a repair station?

Back 31

No. This could cause hidden damage that may render the blade irepairable.

Front 32

What would be the classification of maintenance for shortening a propeller blade?

Back 32

A major repair.

Front 33

May transverse cracks in a metal propeller blade be repaired?

Back 33

No, this is a reason of rejection.

Front 34

What damage to an aluminum alloy propeller blade can be repaired by a mechanic holding a powerplant rating?

Back 34

Small roughness, nicks, and scratches in the leading edge of the blades.

Front 35

How are small nicks removed from the leading edge of a propeller blade?

Back 35

By filing with a file or stone leaving a smooth contour.

Front 36

Who is allowed to reduce the diameter of a type certificated propeller?

Back 36

An FAA certificated propeller repair station with approval for that particular propeller.

Front 37

How can you determine that a surface scratch in an aluminum alloy propeller blade is not actually a crack?

Back 37

By doing a dye penetrant inspection.