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Mod 17 > Propeller Maintenance > Flashcards

Propeller Maintenance Flashcards

1
Q

What are the 3 types of propeller balancing? What is imbalance caused by?

A

Static balancing and dynamic balancing - unequal mass distribution. Aerodynamic balancing - unequal amount of thrust

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2
Q

What is dynamic balancing? When is this done? After checking vibration levels what is installed to reduce vibration?

A

Balancing the propeller to reduce the moment of imbalance. Engines running. Balance weights

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3
Q

How can you tell if a body is in static balance? Where is static balancing carried out? What 2 planes is the balance checked in?

A

Each time the blade is rotated it comes to a stop in a random position. Off the a/c. Horizontal and vertical

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4
Q

What propellers must be aerodynamically balanced? What is the process called?

A

High performance propellers. Blade indexing

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5
Q

How do you tell if a blade is aerodynamically balanced for torque? Thrust? What does ACF stand for?

A

ACF Q. ACF T. Aerodynamic correction factor

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6
Q

What is a universal blade protractor? What is the smallest reading it can take? What must be determined before measuring the angle of a propeller blade?

A

Measure the propeller angle at a specific blade station. 1/10 degree. Reference blade station

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7
Q

What is blade tracking? What does it prevent?

A

Ability of one blade to follow to follow the other in the same plane of rotation. Roughness and vibration

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8
Q

Where measurement for blade tracking taken from? How do you tell if the track is not within limits?

A

Master station. Difference between highest and lowest readings between blade and pointer is within specific tolerance stated in AMM chapter 61

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9
Q

What are the 2 main methods used to check a blades tracking?

A

Flat bench method and block or pointer method

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10
Q

What do you use to carry out the flat bench tracking method? Wha it’s the maximum separation of the lines?

A

Requires a smooth board placed just under the tip of the lower blade and paper taped to it. 3mm or refer to AMM

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11
Q

How do you carry out the block or pointer tracking method? What is the tolerance?

A

Place a solid object next to the propeller blade tip then rotate blades slowly to determine if the next blade tracks through the same point. +-1/16 inch

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12
Q

What can damage to a propeller be divided into? What is the difference?

A

Airworthy damage - can be repaired in the field. Unairworthy damage - damage that exceeds the limits of airworthy damage

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13
Q

Does airworthy damage affect flight safety characteristics of the blade? What do you use to check if damage is airworthy?

A

No. Blade repair manual

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14
Q

What do you use for a tap test? What are you inspecting for? What type of blades is it used on?

A

Metal coin. Delaminations and debonds. Composite

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15
Q

What type of blades is eddy current inspection used on?

A

Ferrous and non ferrous

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16
Q

What is penetrant inspection used for detecting? What is the best penetrant to use?

A

Cracks. Fluorescent

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17
Q

Who can conduct ultrasonic inspections?

A

Appropriately certified engineers

18
Q

Where is a magnetic particle inspection carried out? What type of damage is it used to find? What type of blades is it used for?

A

Appropriately approved maintenance facility. Cracks, inclusions and imperfections. Ferrous blades

19
Q

Where is blade failure most common? Where can you find additional guidance on blade damage?

A

Tip region. Manufacturers service documents

20
Q

What are the 3 types of corrosion on metal propeller components? What are they? How are they identified?

A

Surface corrosion - loss of surface metal due to chemical or electro-chemical action with visible oxidation products, contrasting colour to base metal. Pitting - visible corrosion cavities extending inward from metal surface. Intergranular corrosion- continued moisture presence or where pain protective barriers have been lost. ,teal falling or leading edge cracks

21
Q

Are wood and composite propellers susceptible to corrosion?

A

No

22
Q

What are cracks in the paint across the blade a sign of on wooden propellers? What is the urgency?

A

Flexural vibration. Tipping replaced immediately

23
Q

What are loose rivets on the tipping a sign of on wooden propellers? What is the urgency?

A

Wood beneath is damaged. Propeller removed from service immediately

24
Q

How can surface damage to wooden propeller blades be repaired?

A

Using wood filler or a mix of sawdust and aero glue

25
Q

Are repairs permitted on a wooden blade if the root/shank is damaged?

A

No

26
Q

How often should a metal propeller be inspected for damage?

A

Every 100hrs

27
Q

How much bigger should the leading and trailing edge be compared to the depth of the nick? How much bigger should the blade face and back be compared to the depth of the nick?

A

10x. 30x

28
Q

Why must all repairs to steel propellers be performed at an approved repair facility?

A

All repairs are major as steel is brittle

29
Q

Is anything above the graph line on a bend chart repairable? What do you do if you don’t have access to a chart?

A

No. Contact an overhaul facility for a decision before sending the propeller for straightening

30
Q

What are grease leaks a sign of when inspecting the hub? What are oil leaks a sign of when inspecting the hub?

A

Damage to blade attachment seals. Damage to seals in pitch change cylinder or damage to blade attachments

31
Q

What must the hub be inspected for? What can be sprayed to the hub after cleaning as corrosion protection?

A

Cracks and corrosion. Lubricant spray

32
Q

Can a propeller hub be repaired if there are signs of a lightning strike? Do you have to replace the entire propeller?

A

No. Yes

33
Q

What are static checks? When are they carried out?

A

Checks carried out without the engine running. Before an engine run

34
Q

What is MAP (Manifold Air Pressure)? What type of a/c is MAP specific to?

A

Power developed is related to air pressure in engine air induction manifold. Piston engines (supercharged engines)

35
Q

How do you check a reference RPM? How do you carry out a reference power check?

A

Carry out a reference power check. Set propeller to fine pitch, advance throttles until manifold pressure reads 0 then check that RPM matches the reference RPM

36
Q

If engine throttle advances and RPM increases what happens to MAP and overall performance of the engine?

A

Increases

37
Q

When do fixed pitch propellers not attain max RPM? Why?

A

If nil wind conditions. Prevent overspending during takeoff

38
Q

What is monitored to ensure the engine is running correctly for a turboprop engine?

A

Exhaust Gas Temp and Fuel Flow

39
Q

What does a piston engine use to determine RPM? What does a turboprop use to determine RPM?

A

Boost pressure. Produces a selected RPM for a given torque

40
Q

At what temp must the air inlet icing be turned ON to prevent moisture?

A

Below 10 degrees

41
Q

What direction should an engine be facing for an engine ground test?

A

Into the wind

Mod 17 (7 decks)

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