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Mod 6 > 6.3.2 > Flashcards

6.3.2 Flashcards

1
Q

What are the main lengthwise members in a wing called?

A

Spars

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2
Q

What are wood spars normally made from?

A

Sitka spruce

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3
Q

What is meant by a solid wood spar?

A

When the spar is made from one whole piece of wood

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4
Q

What is meant by laminated wood spar?

A

When the spar is made from multiple pieces of wood glued together with the grain in the same direction

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5
Q

What forces does a box spar take?

A

Torsional and bending

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6
Q

What is the main cause of timber shrinkage?

A

Large cyclic changes of temperature and humidity

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7
Q

What will long exposure to weather or strong sunlight do to wooden aircraft?

A

It will destroy the weather-proofing qualities of fabrics and surface finishes

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8
Q

What happens when fabric covered ply structures are neglected?

A

Surface finish will crack allowing in moisture resulting in deterioration

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9
Q

How should you store a wooden aircraft?

A

In a dry, well ventilated hangar with all inspection panels removed

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10
Q

Before examining glued joints or carrying out repairs what must you ensure on a wooden aircraft?

A

That it is thoroughly dried out

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11
Q

Upon opening an inspection panel what should you check?

A

For a smell of fungal growth or dampness

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12
Q

Where does timber and glue deterioration often take place?

A

The inside of a structure

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13
Q

Why is assessment of glued joints in wooden aircraft structures difficult?

A

There is no NDT for it and lack of accessibility

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14
Q

Where access is required and no approved scheme exists who do you contact?

A

Aircraft manufacturer or a CAA approved organisation

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15
Q

How are access holes created?

A

With a sharp trepanning tool and in a circular shape

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16
Q

If a rectangle access hole is created, what must you ensure with the corners?

A

That they have the correct radii

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17
Q

When checking a glue line what must be removed?

A

All protective coatings of paint by scraping

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18
Q

When inspecting a glue line with a feeler gauge, what is the outcome if any penetration is possible?

A

The joint should be regarded a defective

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19
Q

How is dry rot detected?

A

Small patches of crumbling wood

20
Q

What are the signs of water penetration?

A

Dark discolouration or grey streaks

21
Q

How is bruising and Cushing caused on wooden aircraft?

A

Over tightening of bolts

22
Q

How long is timber cut then stacked prior to shipment for?

A

60 days

23
Q

How long is timber usually seasoned in air-drying sheds for?

A

1-3 years

24
Q

What is the reason timber is seasoned?

A

It reduces moisture until it is the same moisture level as atmospheric moisture which allows ease of treatments

25
Q

Before taking timber for testing what should happen?

A

Approximately 6 inches should be cut from the end as it might be drier than the rest

26
Q

What are the two ways of testing for moisture content in timber?

A

Moisture meter and weighing before and after drying

27
Q

What is the general correct moisture content levels for timber?

A

15% with +/-2%

28
Q

If timber has a rate of growth of less than 6 rings per 25mm what should happen?

A

It should be rejected

29
Q

What are the two types of sawing?

A

Rift sawing and tangential sawing

30
Q

What is rift sawing?

A

When you cut timber along the radius of the rings

31
Q

What is tangential sawing?

A

When you cut timber at a tangent of the rings

32
Q

What sawing method is commonly known as flower-face?

A

Tangential sawing

33
Q

What is the worst defect for timber to have?

A

Dote disease

34
Q

What must you do if you find timber with dote disease?

A

Burn it

35
Q

What should you do if you find heart-shake or ring-shake in timber?

A

Cut it out

36
Q

When gluing wood together what is important?

A

Prevent end-grain gluing and apply pressure evenly over the surfaces

37
Q

What should you do before gluing plywood together?

A

Sand it to remove surface glazing and loose fibres

38
Q

What should happen to timber surfaces that are going to be glued?

A

They should be roughened to form a firm key for adhesives

39
Q

Why is moisture content important before glueing two pieces of wood together?

A

The pieces of wood should have the same moisture content to prevent swelling or shrinkage

40
Q

What should happen to temperature of the wood before gluing?

A

The wood should be left to settle at room temperature

41
Q

When gluing two pieces of timber together how should the glue be applied?

A

To both pieces with a glue spreader

42
Q

When using solvent adhesive why is it important to make sure it has all evaporated before using?

A

Bubbles may be created causing weakness

43
Q

What will happen if you’re applying too much heat to timber and freshly applied glue?

A

It could scorch the timber and cause the glue to bubble

44
Q

Where should tests of timber be carried out?

A

On off cuts

45
Q

If off cuts aren’t available to test on what should be used?

A

Representative test pieces

46
Q

When storing adhesives what should the temperature not exceed?

A

21C

Mod 6 (17 decks)

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