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CAA Module 17 > Module 17.6 Propeller maintenance > Flashcards

Module 17.6 Propeller maintenance Flashcards

1
Q

When working with propellers three different types of balancing are of importance, what are these?

A
  • Static
  • Dynamic
  • Aerodynamic
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2
Q

What are static and dynamic imbalances caused by?

A

Unequal mass distribution

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3
Q

Why is aerodynamic balancing done?

A

Ensure each blade delivers the same thrust

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4
Q

A body is in static balance when?

A

Centre of gravity lies at the centre of rotation

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5
Q

Static balance is checked in what planes?

A

Vertical and horizontal

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6
Q

Where is static balancing done?

A

Off of the aircraft

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7
Q

What is dynamic balancing?

A

Balancing the moment to reduce the moment of imbalance

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8
Q

How is the dynamic balancing checked?

A

While the engine is running

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9
Q

When is an object in aerodynamic balance?

A

When the aerodynamic forces acting on the blades result in no periodic vibrations in the mountings. This means each blade will produce equal thrust

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10
Q

What does vibration caused by the blades being unbalanced aerodynamically get worse with?

A

Becomes worse with increasing pitch and thrust

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11
Q

Aerodynamic correction factor is either done for what?

A

Thrust or torque

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12
Q

What will the blade be marked with for ACF, thrust and torque?

A

Thrust - T
Torque - Q

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13
Q

Aerodynamic balancing is only necessary for what propellers?

A

High performance

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14
Q

What is the universal blade protractor used to determine?

A

Used to measure the angle to a reference station. Done to ensure all blades are properly adjusted

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15
Q

Where is the reference station usually?(Universal Blade Protractor)

A

30 inch, 36 inch, 42 inch

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16
Q

What is blade tracking?

A

Ability of one blade to follow the other in the same plane of rotation

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17
Q
A
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17
Q

What are the two methods for checking blade tracking?

A
  • Falt bench method
  • Block or pointer method
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18
Q

How far should the pencil lines be apart in the flat bench method?

A

3mm

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19
Q

What should the tracking separation be in the block or pointer method?

A

+- 1/16 inch

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20
Q

Airworthy damage limits are described where?

A

Within AMM chapter 61

21
Q

What methods can be used for inspecting the blades for damage?

A
  • Visual
  • Tap
  • Dye penetrant
  • Ultrasonic
  • Eddy current
  • Magnetic particle
22
Q

The use of what dyes is not recommended?

A

Visible dyes

23
Q

What 3 categories can the corrosion on the blade be classified into?

A
  • Surface
  • Pitting
  • Intergranular
24
Q

What are composite and wood propellers susceptible?

A

Delamination

25
Q

Cracks in the paint are signs of what?

A

Flexural vibration

26
Q

Less significant damage on the trailing edge or on the blade of wood propellers can be filled with what?

A

Plastics

27
Q

How often should blades be inspected?

A

Every 100 hours or at annual check

28
Q

How must nicks be repaired?

A

Blending

29
Q

How much must the blend be on the TE and LE?

A

10 x depth of nick for the leading and trailing edges

30
Q

How much must the blend be on the blade face and back?

A

30 x the depth for the blade face and back

31
Q

What must the hub be checked for periodically?

A

Cracks and corrosion

32
Q

Damage on composites is classified as what?

A

Acceptable or unacceptable

33
Q

Sub-classification of damage may also be sub-divided as what?

A
  • Skin perforated damage
  • Skin not perforated damage
34
Q

What pump is used to carry out static checks?

A

Electric feathering pump

35
Q

What are some static checks?

A
  • Flight Fine Pitch Stop (FFPS)
  • Auto-coarsening
  • Manual Feather
  • Autofeather
  • Unfeather
36
Q

When are static checks usually carried out?

A

Prior to an engine ground run

37
Q

What is the benefit to static checks?

A

The engine does not need to be run

38
Q

Piston engines were further classified as what?

A

Normally aspirated and supercharged

39
Q

The air pressure in the engine air induction manifold is known as what?

A

Manifold Air Pressure

40
Q

How is the reference RPM checked?

A

Setting the propeller to a fine pitch, advancing the throttle until the manifold pressure reads zero boost

41
Q

What is the reference RPM?

A

The RPM when it reaches 0 boost

42
Q

What way should the aircraft face during an engine test?

A

Into the wind

43
Q

Below what temperature must the anti-ice be on?

A

10℃

44
Q

Turboprop engine power is measured in what?

A

Shaft horsepower

45
Q

To determine that the engine is operating correctly then the engine exhaust gas temperature (EGT) and fuel flow (FF) must be monitored against the referenced what? (Piston)

A

Torque and RPM

46
Q

What two pieces of formation are required to correct a propeller dynamic imbalance?

A

Vibration level and phase angle

47
Q

What is the purpose of the steel wire mesh?

A

Inhibit blade tip erosion

48
Q

When airspeed increases what happens to the brake moment?

A

Brake moment decreases

49
Q

What does ACF stand for?

A

Aerodynamic Correction Factor

50
Q

Where do fatigue failures occur?

A

Few inches from tip

CAA Module 17 (6 decks)

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