7.18A

Question 1

What two defects do you inspect for

Answer 1

Corrosion
Metal fatigue

Question 2

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

Answer 2

Replace

Question 3

What is metal fatigue

Answer 3

Weakening of a metal part under repeated cycles of stress

Question 4

How is metal fatigue accelerated

Answer 4

By corrosion

Question 5

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

Answer 5

Get NDT in

Question 6

What should you do if you find articles

Answer 6

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

Question 7

When inspecting/probing a joint what should you use

Answer 7

Non metallic instrument

Question 8

What endoscope should you use in areas that might combust

Answer 8

2nd type/ cold light source

Question 9

What is the definition of damage

Answer 9

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

Question 10

What are the damage classification

Answer 10

Allowable
Non allowable
Non repairable

Question 11

What does allowable damage mean

Answer 11

Slight/little significance
Does not mean repair is unnecessary

Question 12

What does non allowable mean

Answer 12

Exceeds allowable damage limits - repair it

Question 13

What does non repairable mean

Answer 13

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

Question 14

When should you remove corrosion

Answer 14

Most corrosion should be removed

Question 15

What chapter tells you about limits of corrosion

Answer 15

Chapter 51 or SRM

Question 16

What else should you do when removing corrosion

Answer 16

Make a note of how much corrosion you have removed

Question 17

When inspecting painted surface corrosion what are the signs of it

Answer 17

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

Question 18

What colours can corrosion show up as

Answer 18

White, grey, red dust particles

Question 19

How should you remove light corrosion

Answer 19

Abrasive cloths or pads

Question 20

What wire brushes should you use to get rid of corrosion

Answer 20

Stainless steel or aluminium oxide coated brushes

Question 21

How should you remove hard corrosion

Answer 21

Grinding motor

Question 22

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

Answer 22

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

Question 23

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

Answer 23

When corrosion is heavy
Suitable for aluminium and steel alloys

Question 24

When should you use abrasive blasting

Answer 24

On filiform corrosion

Question 25

How can you ensure that all the corrosion has been removed

Answer 25

By using a x10 magnifier Getting NDT IN

Question 26

How do aluminium alloy corrosion present itself

Answer 26

White deposits Etching, pitting and roughness

Question 27

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

Answer 27

Carbon steel and steel wool brushes Use stainless steel

Question 28

How does corrosion on carbon steel present itself

Answer 28

Red rust

Question 29

How does corrosion on stainless steel/nickel chromium present itself

Answer 29

Pitting usually a black colour

Question 30

How does titanium alloy corrosion present itself

Answer 30

Black or white colour

Question 31

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

Answer 31

Gental corrosion removal because small chips that can easily ignite

Question 32

How would you put out a titanium fire

Answer 32

Sand or a non water based extinguisher

Question 33

How do you remove corrosion from cadmium plated parts

Answer 33

Dampened abrasive pad

Question 34

How do you dispose of cadmium plates corrosion

Answer 34

By instructions from local authorities

Question 35

What does SAA stand for

Answer 35

Sulphuric acid anodising

Question 36

What does CAA stand for

Answer 36

Chromic acid

Question 37

What does CCC stand for

Answer 37

chemical conversion coating

Question 38

What paint finish does airbus follow

Answer 38

3 phases paint system

Question 39

What paint finish does Boeing follow

Answer 39

2 phase paint finishing system

Question 40

What should you do if you suspect a corrosion under paint

Answer 40

Make a small test area

Question 41

What are the three types of surface protection repairs

Answer 41

Fixing Partial/total renewel Basic renewal

Question 42

What is the main example of a corrosion protective paints

Answer 42

Electrically conductive paint

Question 43

What areas need priming for electrically conductive paint

Answer 43

All plastic components of outer skin expect the antenna

Question 44

What else need to be covered with electrically conductive paint

Answer 44

Minimum of 75% of all countersinks

Question 45

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

Answer 45

Dinitrol Oil based so no oxygen systems as will explode