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M17 > 17.6 > Flashcards

17.6 Flashcards

1
Q

Three types of propeller balancing?

A

Static balancing
Dynamic balancing
Aerodynamic balancing

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2
Q

Static balancing is usually carried out by who?

A

Manufacturer or at overhaul

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3
Q

Where should centre of gravity always lie?

A

On the axis of rotation

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4
Q

What is horizontal balancing?

A

Varnish or paint can be added, or solder to tip

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5
Q

What is vertical balancing?

A

Weights can be attached to the hub

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6
Q

For propellers of aircraft up to 5700kg what is the permissible tolerance?

A

2gm

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7
Q

What can secure the wool in place that is placed in the balancing tube?

A

Welch plug

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8
Q

Dynamic balancing must be carried out when engine is…?

A

Running

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9
Q

Moment of imbalance caused by the lateral shift of what?

A

Of the blades Centre of Gravity

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10
Q

One method of dynamic balancing?

A

Weights attached to to each blade
A polar diagram is drawn to show where biggest imbalance is
Heaviest weight added to where biggest imbalance is

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11
Q

Four steps to dynamically balance a propeller?

A
  1. Obtain in flight vibration info
  2. Ensure vibration is out of tolerance
  3. Calculate mass and location of vibration
  4. Install balance weights
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12
Q

Aerodynamic balancing only required for what propellers?

A

High performance propellers

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13
Q

What is blade tracking?

A

Blades need to follow each other in direction of rotation

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14
Q

Cracks in the paint of wooden propellers are signs of what?

A

Flexural vibrations

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15
Q

If loose tipping rivets are found beneath wood what should happen?

A

Propeller taken out of service immediately

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16
Q

When installing new wooden fixed propellers, attachment bolts must be re-tightened after how many flying hours?

A

25 hours

17
Q

What damaged of wooden propellers cannot be repaired and propeller is unusable?

A

Cracks across grain
Splintered blade
Delamination
Missing material
Cracks in hub
Enlargement of the hub shaft bore
Elliptical bolt holes

18
Q

After re tightening of attachment bolts on wood prop, and then checked every what?

A

50 hours

19
Q

Why are metal propellers subject to metal fatigue?

A

Caused by high dynamic loads

20
Q

Recommended measures for care of metal propellers?

A

Maintenance instructions
RPM limitations
Never taxi at high power if sand, stones can be sucked into propeller
Clean propeller regularly and rub with an oily cloth or car polish
Do not cover propeller
When pulling use propeller root and not blades
Carry out pre and after flight inspection for nicks
Every 100 hours or annually inspect propeller

21
Q

What is important to remember when repairing a damaged metal blade?

A

No repairs are permitted on the blade root

22
Q

All repairs for steel propellers must be done by who?

A

Approved repair facility

23
Q

For composite propellers damage is either what or what?

A

Skin not perforated damage
Or
Skin perforated damage

24
Q

Types of Skin perforated damage?

A

Lightning strikes
Holes

25
Q

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

A

Manifold air pressure or MAP

26
Q

In super charged engines what is MAP called?

A

Boost pressure

27
Q

What do you set the propeller to if doing a reference RPM check?

A

Fine pitch

28
Q

When doing a reference RPM check ensure propeller is facing into wind and wind isn’t in excess of what?

A

25kmh

29
Q

During ground running where should RPM lever be put?

A

Constant speed range
RPM should reduce then stabilise

30
Q

To determine engine is operating correctly what should be monitored?

A

Exhaust gas temperature (EGT)
Fuel flow (Wf)
Must be monitored against referenced torque and RPM

31
Q

There is always a relationship between what torque and what else?

A

RPM
Fuel flow
EGT

32
Q

Turbo prop engine power is measured in what?

A

Shaft horse power

33
Q

Two examples of skin perforated damage?

A

Lightning strikes
Holes

M17 (10 decks)

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