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M7 Richard > 7.18 > Flashcards

7.18 Flashcards

1
Q

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

A

Corrosion and metal fatigue.

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2
Q

What is an endoscope used for?

A

Inspection of interior structure or components.

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3
Q

What magnifying glass is usually used?

A

8x

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4
Q

What must damage be classified as?

A

Allowable

Non-allowable

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5
Q

What 5 methods of corrosion removal is there?

A 
Abrasion by hand
Wire brushing
Grinding
Rotary files
Abrasive blasting
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6
Q

What corrosion removal method is recommended for heavy corrosion?

A

Rotary file.

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7
Q

What corrosion removal method is not recommended for internal corrosion?

A

Abrasive blasting.

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8
Q

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

A

10x

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9
Q

How is corrosion on steel usually shown?

A

Putting, usually black in colour.

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10
Q

How is corrosion on titanium shown?

A

Black or white coloured oxide.

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11
Q

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

A

Eloxadising.

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12
Q

What is the disadvantage of a eloxadising layer?

A

Cracks easily.

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13
Q

What are phosphate coatings used for?

A

Corrosion resistance, lubricity or foundation for coatings and paints.

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14
Q

What are the main types of phosphate coatings?

A

Manganese, iron and zinc.

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15
Q

What is CCC?

A

Chemical Conversion Coating.

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16
Q

What is a paint system?

A

Complete build up of all layers of a paint finish.

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17
Q

What paint systems do Airbus and Boeing use?

A

Airbus- 3 paint system

Boeing- 2 paint system

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18
Q

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

A

Corrosion protection.

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19
Q

What does the FCR mean in Wash Primer FCR?

A

Filliform corrosion resistant.

20
Q

When is an FCR primer not recommended?

A

Humidity more than 75%

Temps lower than 15 Celsius

21
Q

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

A

180 KSI

22
Q

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

A

6 hours at temps of 18-22 Celsius.

23
Q

What does phosphoric acid cause in primers?

A

Hydrogen embrittlement

24
Q

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

A

4 hours.

24 hours at 18 Celsius.

25
Q

What is the last paint layer applied?

A

Coating lacquer.

26
Q

Where are all coating lacquers applied?

A

All outer cabin parts subject to weather conditions.

And interior parts which have contact with hydraulic oils and other aggressive fluids.

27
Q

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

A

25-50%

28
Q

What are electrically conductive paints for?

A

Plastic parts.

Exception antennae covers

29
Q

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

A

75%

30
Q

What is the most common encountered water displacing inhibitor?

A

Dinitrol

31
Q

Where are fillet seals applied?

A

Edges of structural joints.

32
Q

Where are injection seals applied to?

A

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

33
Q

What is a faying surface seal for?

A

Sandwiched between 2 fastened mating parts.

Recommended thickness 0.005-0.015 inch thickness

34
Q

What are prepack seals for?

A

Fill structural cavities that are enclosed after assembly.

35
Q

What is a seal plane?

A

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

36
Q

What 2 categories are sealants divided into?

A

Silicon and non-silicon.

37
Q

What are silicon compounds?

A

Usually white, red or grey in colour.

Where heat resistance is required.

38
Q

Where are non silicon sealants used?

A

Where heat resistance is not required.

39
Q

What is the classification for sealants?

A 
Class A-   Brush coat 
Class B-   Filleting
Class C-   Faying surface
Class D-   Hole-filling
Class E&F-   Sprayable
40
Q

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

A

Bubbling will occur.

41
Q

What do uncured silicons absorb?

A

CO2

42
Q

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

A

Fillet.

43
Q

What is used to seal fasteners within fuel tanks?

A

Metal seal caps.

44
Q

Must 2 part sealants be completely mixed?

A

Yes.

Streaked appearance evidence of incorrect mixing

45
Q

What temperature are mixed sealants stored at?

A

Maximum -40 Fahrenheit

46
Q

What does a vacuum cleaner do?

A

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

47
Q

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

A

MEK

M7 Richard (16 decks)

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