7.18

Question 1

What are the 2 main types of defects being looked for on disassembly?

Answer 1

Corrosion and metal fatigue.

Question 2

What is an endoscope used for?

Answer 2

Inspection of interior structure or components.

Question 3

What magnifying glass is usually used?

Answer 3

8x

Question 4

What must damage be classified as?

Answer 4

Allowable

Non-allowable

Question 5

What 5 methods of corrosion removal is there?

Answer 5

Abrasion by hand
Wire brushing
Grinding
Rotary files
Abrasive blasting

Question 6

What corrosion removal method is recommended for heavy corrosion?

Answer 6

Rotary file.

Question 7

What corrosion removal method is not recommended for internal corrosion?

Answer 7

Abrasive blasting.

Question 8

What magnifying glass is recommended to inspect the removal of corrosion?

Answer 8

10x

Question 9

How is corrosion on steel usually shown?

Answer 9

Putting, usually black in colour.

Question 10

How is corrosion on titanium shown?

Answer 10

Black or white coloured oxide.

Question 11

What process is similar to anodising but done with sulphuric acid?

Answer 11

Eloxadising.

Question 12

What is the disadvantage of a eloxadising layer?

Answer 12

Cracks easily.

Question 13

What are phosphate coatings used for?

Answer 13

Corrosion resistance, lubricity or foundation for coatings and paints.

Question 14

What are the main types of phosphate coatings?

Answer 14

Manganese, iron and zinc.

Question 15

What is CCC?

Answer 15

Chemical Conversion Coating.

Question 16

What is a paint system?

Answer 16

Complete build up of all layers of a paint finish.

Question 17

What paint systems do Airbus and Boeing use?

Answer 17

Airbus- 3 paint system

Boeing- 2 paint system

Question 18

What does a wash primer act as in the interior structure?

Answer 18

Corrosion protection.

Question 19

What does the FCR mean in Wash Primer FCR?

Answer 19

Filliform corrosion resistant.

Question 20

When is an FCR primer not recommended?

Answer 20

Humidity more than 75%

Temps lower than 15 Celsius

Question 21

What must wash primer FCR not be applied to steels with breaking strength more than?

Answer 21

180 KSI

Question 22

What is the pot life time for intermediate primers after preparation?

Answer 22

6 hours at temps of 18-22 Celsius.

Question 23

What does phosphoric acid cause in primers?

Answer 23

Hydrogen embrittlement

Question 24

What is the pot life and cure times for epoxy resins?

Answer 24

4 hours.

24 hours at 18 Celsius.

Question 25

What is the last paint layer applied?

Answer 25

Coating lacquer.

Question 26

Where are all coating lacquers applied?

Answer 26

All outer cabin parts subject to weather conditions. And interior parts which have contact with hydraulic oils and other aggressive fluids.

Question 27

How much can a clear varnish increase age of a paint system?

Answer 27

25-50%

Question 28

What are electrically conductive paints for?

Answer 28

Plastic parts. | Exception antennae covers

Question 29

How many countersinks in composite components must be covered electrically inductive paint?

Answer 29

75%

Question 30

What is the most common encountered water displacing inhibitor?

Answer 30

Dinitrol

Question 31

Where are fillet seals applied?

Answer 31

Edges of structural joints.

Question 32

Where are injection seals applied to?

Answer 32

Fill channels and holes that occur as a result of structural design.

Question 33

What is a faying surface seal for?

Answer 33

Sandwiched between 2 fastened mating parts. Recommended thickness 0.005-0.015 inch thickness

Question 34

What are prepack seals for?

Answer 34

Fill structural cavities that are enclosed after assembly.

Question 35

What is a seal plane?

Answer 35

The structural boundary on which the continuity of seal is established.

Question 36

What 2 categories are sealants divided into?

Answer 36

Silicon and non-silicon.

Question 37

What are silicon compounds?

Answer 37

Usually white, red or grey in colour. Where heat resistance is required.

Question 38

Where are non silicon sealants used?

Answer 38

Where heat resistance is not required.

Question 39

What is the classification for sealants?

Answer 39

``` Class A- Brush coat Class B- Filleting Class C- Faying surface Class D- Hole-filling Class E&F- Sprayable ```

Question 40

What will happen to a sealant if temps are over 120 Fahrenheit.

Answer 40

Bubbling will occur.

Question 41

What do uncured silicons absorb?

Answer 41

CO2

Question 42

What is the only method of sealing that prevents fuel leakage in fuel tanks?

Answer 42

Fillet.

Question 43

What is used to seal fasteners within fuel tanks?

Answer 43

Metal seal caps.

Question 44

Must 2 part sealants be completely mixed?

Answer 44

Yes. | Streaked appearance evidence of incorrect mixing

Question 45

What temperature are mixed sealants stored at?

Answer 45

Maximum -40 Fahrenheit

Question 46

What does a vacuum cleaner do?

Answer 46

Removes aluminium swarf and other debris from areas ready to be sealed?

Question 47

What is the most commonly used solvent for cleaning structures prior to sealing?

Answer 47

MEK