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M7 > 7.18A > Flashcards

7.18A Flashcards

1
Q

What two defects do you inspect for

A

Corrosion
Metal fatigue

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2
Q

What do you do if a component has inter-granular corrosion

A

Replace

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3
Q

What is metal fatigue

A

Weakening of a metal part under repeated cycles of stress

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4
Q

How is metal fatigue accelerated

A

By corrosion

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5
Q

If you need further inspection of metal fatigue what do you do

A

Get NDT in

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6
Q

What should you do if you find articles

A

Examine to see if they are loose articles or indicative of structural failure

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7
Q

When inspecting/probing a joint what should you use

A

Non metallic instrument

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8
Q

What endoscope should you use in areas that might combust

A

2nd type/ cold light source

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9
Q

What is the definition of damage

A

Any permanent deformation/alteration of the cross section of structural component

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10
Q

What are the damage classification

A

Allowable
Non allowable
Non repairable

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11
Q

What does allowable damage mean

A

Slight/little significance
Does not mean repair is unnecessary

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12
Q

What does non allowable mean

A

Exceeds allowable damage limits - repair it

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13
Q

What does non repairable mean

A

Damage to structural repair components that cannot be repaired
Replacement as repair is not practical or economical

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14
Q

When should you remove corrosion

A

Most corrosion should be removed

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15
Q

What chapter tells you about limits of corrosion

A

Chapter 51 or SRM

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16
Q

What else should you do when removing corrosion

A

Make a note of how much corrosion you have removed

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17
Q

When inspecting painted surface corrosion what are the signs of it

A

Scaly or blasted surface
Change of colour
Blisters in paint
Dull darkened pitts in metallic surface

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18
Q

What colours can corrosion show up as

A

White, grey, red dust particles

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19
Q

How should you remove light corrosion

A

Abrasive cloths or pads

20
Q

What wire brushes should you use to get rid of corrosion

A

Stainless steel or aluminium oxide coated brushes

21
Q

How should you remove hard corrosion

A

Grinding motor

22
Q

What are the disadvantages of a grinding motor to get rid of corrosion

A

Not suitable for aluminium alloys
Can cause high temps so changes mechanical properties

23
Q

When should you use rotary files and what is it suitable for

A

When corrosion is heavy
Suitable for aluminium and steel alloys

24
Q

When should you use abrasive blasting

A

On filiform corrosion

25
Q

How can you ensure that all the corrosion has been removed

A

By using a x10 magnifier
Getting NDT IN

26
Q

How do aluminium alloy corrosion present itself

A

White deposits
Etching, pitting and roughness

27
Q

What brushes can’t you use on aluminium alloy and what should you use

A

Carbon steel and steel wool brushes
Use stainless steel

28
Q

How does corrosion on carbon steel present itself

A

Red rust

29
Q

How does corrosion on stainless steel/nickel chromium present itself

A

Pitting usually a black colour

30
Q

How does titanium alloy corrosion present itself

A

Black or white colour

31
Q

How do you remove corrosion on titanium and what do you need to be careful off

A

Gental corrosion removal because small chips that can easily ignite

32
Q

How would you put out a titanium fire

A

Sand or a non water based extinguisher

33
Q

How do you remove corrosion from cadmium plated parts

A

Dampened abrasive pad

34
Q

How do you dispose of cadmium plates corrosion

A

By instructions from local authorities

35
Q

What does SAA stand for

A

Sulphuric acid anodising

36
Q

What does CAA stand for

A

Chromic acid

37
Q

What does CCC stand for

A

chemical conversion coating

38
Q

What paint finish does airbus follow

A

3 phases paint system

39
Q

What paint finish does Boeing follow

A

2 phase paint finishing system

40
Q

What should you do if you suspect a corrosion under paint

A

Make a small test area

41
Q

What are the three types of surface protection repairs

A

Fixing
Partial/total renewel
Basic renewal

42
Q

What is the main example of a corrosion protective paints

A

Electrically conductive paint

43
Q

What areas need priming for electrically conductive paint

A

All plastic components of outer skin expect the antenna

44
Q

What else need to be covered with electrically conductive paint

A

Minimum of 75% of all countersinks

45
Q

What is the most common water repellent fluid and where can’t you use it

A

Dinitrol
Oil based so no oxygen systems as will explode

M7 (15 decks)

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