7.18 Disassembly

Question 1

Inspection of metal aircraft structures is mainly to check for all types of damages that may occur on the aircraft structures, but the main types of defect being inspected for are [a] and metal [b].

Answer 1

corrosion and metal fatigue

Question 2

Cleaning fluids

Answer 2

Approved aircraft constructor

Question 3

vacuum cleaners are inserted with

Answer 3

Protective rubber adaptors

Question 4

Should you use air jets?

Answer 4

NO, avoid using them

Question 5

There are 3 levels of structural inspection. They are: (1) General [a] Inspection (GVI), (2) [b] Inspection (DET) and (3) [c] Detailed Inspection(SDI).

Answer 5

1. General visual
2. Detailed
3. Special detailed

Question 6

The optical aids that can be used during structural visual inspection are: (1) Torches, (2) [a], (3) Loupes and (4) [b] or Endoscope.

Answer 6

Mirrors,borescope

Question 7

According to Structural Repair Manual (ATA Chapter 51), structural damages are classified in four main groups: (1) [a] action (forced damage), (2) Chemical/electrochemical reaction (corrosion damage), (3) [b] action (heat damage) and (4) Inner [c] characteristics (fatigue damage).

Answer 7

Specified Answer for: a	
mechanical
Specified Answer for: b	
thermal
Specified Answer for: c	
metallurgical

Question 8

Structural damage contains: (1) every type of permanent [a], (2) every type of gradual change in [b], and (3) every type of [c] loss caused by e.g. fatigue or heat exposure.(ATA chap 51)

Answer 8

Specified Answer for: a	
deformation
Specified Answer for: b	
section
Specified Answer for: c	
strength

Question 9

A scratch is a line of damage of any [a] and [b] in the material and results in a [c] area change. It is usually caused by contact with a object

Answer 9

Specified Answer for: a	
depth
Specified Answer for: b	
length
Specified Answer for: c	
cross-sectional

Question 10

What is a gouge?

Answer 10

continuous, sharp, or smooth channel-like groove in

Question 11

What is a mark or abrasion?

Answer 11

scratched area of any size

Question 12

What is a crack?

Answer 12

fracturewith

Question 13

What is a nick?

Answer 13

the edge of a member or skin

Question 14

Heat damage can be [a] (e.g. lightning strike) or extensive [b] exposure (e.g. burn) at metallic structural parts, which can result in a loss of [c]. For damage investigation, a hardness testing or a test of electrical conductivity can be done.

Answer 14

Specified Answer for: a	
punctual
Specified Answer for: b	
heat
Specified Answer for: c	
strength

Question 15

The failure modes of composite structures are different from metal structures. There is no [a] deformation in the composite structure. Two main types of composite structure damage are (1) [b] and (2) [c].

Answer 15

Specified Answer for: a	
plastic
Specified Answer for: b	
delamination
Specified Answer for: c	
debonding

Question 16

All corrosions found must be removed [a] and [b]. This is essential because corrosion which remains will cause [c] corrosion and further decrease the strength of the structure.

Answer 16

Specified Answer for: a	
immediately
Specified Answer for: b	
completely
Specified Answer for: c	
new

Question 17

What is a distortion?

Answer 17

twisting, bending or permanent strain

Question 18

When using [a] files to remove corrosion, avoid prolonged periods of grinding as it will cause the [b] properties of the material to change.

Answer 18

Specified Answer for: a
rotation
Specified Answer for: b
chemical

Question 19

Exposure of titanium surface to hydraulic fluids (Skydrol) will cause hydrogen [a] with subsequent [b] of the surface. Corrosion on titanium alloy is recognized as a black or white colored [c].

Answer 19

Specified Answer for: a	
embrittlement
Specified Answer for: b	
pitting
Specified Answer for: c	
oxide

Question 20

For corrosion removal on steel or titanium parts, abrasives with [a] carbide should be used. They can be identified by their green-[b] color. For corrosion removal on aluminium parts, use only aluminium-oxide (corundum) grinding tools. They can be identified by their red-[c] color.

Answer 20

Specified Answer for: a	
silica
Specified Answer for: b	
blue
Specified Answer for: c	
brown

Question 21

Pretreatment (e.g. Alodine, CAA, SAA) is the initial treatment of the metal and has the following functions: (1) To increase the corrosion resistant properties of the metal by [a] or [b] procedures, and (2) To provide a good surface for the [c] of the subsequent paint coats.

Answer 21

Specified Answer for: a	
chemical
Specified Answer for: b	
electrolytical
Specified Answer for: c	
adhesion

Question 22

Two methods of paint removal are possible: (1) Where the corrosion is light and contained within a small area, use the [a] method. (2) Where the corrosion is heavy and covers a large area, the [b] method is recommended.

Answer 22

Specified Answer for: a
mechanical
Specified Answer for: b
chemical

Question 23

What if the corrosion is light and covers a small area?

Answer 23

Use mechanical method

Question 24

What if the corrosion is large and covers a big area

Answer 24

Use chemical method.

Question 25

For corrosion removal of aluminum, components use what?

Answer 25

Use aluminum oxide (corundum). RED and BROWN color

Question 26

What grain should you use to remove corrosion

Answer 26

240 then 400 to make a smooth surface

Question 27

What safety factor must you take note of when using a motor-driven grinding wheel

Answer 27

Use safety goggles or a face shield.

Question 28

Wire brushing can remove what type of corrosion

Answer 28

Heavy corrosion

Question 29

Abrasive cleaning can remove what type of corrosion

Answer 29

large area corrosion on a flat sheet.

Question 30

what can determine corrosion depth and remove heavy corrosion

Answer 30

Rotating files made out of carbide.

Question 31

what type of corrosion can be found on carbon steel

Answer 31

red iron rust.

Question 32

what type of corrosion can be found on titanium alloy

Answer 32

black or white-colored oxide.

Question 33

what happens when small chips from titanium are found?

Answer 33

Fire hazard. extinguish with DRY TALCUM POWDER, CALCIUM CARBONATE, SAND, OR GRAPHITE. do not use water

Question 34

What can you use to remove corrosion on steel/titanium parts?

Answer 34

silica carbide. (Blue green color)

Question 35

what to check for after corrosion removal

Answer 35

check for cracks.

Question 36

What is anodizing?

Answer 36

A direct current chromic | acid treatment of the aluminium surface.

Question 37

What does CHEMICAL CONVERSION COATING (CCC) form?

Answer 37

An aluminium-chromium-oxide cover is formed which is up to 0.001mm thick.

Question 38

what is the max temperature allowed for CHEMICAL CONVERSION COATING (CCC) and why?

Answer 38

max 70 degrees else the adhering property of the coating will decrease.

Question 39

What is the number of layers of aircraft paint airbus?

Answer 39

3 layers 1) wash primer 2) paint primer 3) Topcoat

Question 40

Wash primer should not be put on high tensile steel with a tensile strength of more than?

Answer 40

180KSI

Question 41

What is the number of layers of aircraft paint by Boeing?

Answer 41

2 layers 1) epoxy primer 2) topcoat

Question 42

what happens if the curing time is not observed before the next quote?

Answer 42

corrosion protection and adhesion will be impaired.

Question 43

when should wash primer not be used?

Answer 43

steel with a breaking strength of more than 180KSI

Question 44

perks of epoxy primer?

Answer 44

no phosphoric acid and good for coating high-strength steel parts.

Question 45

all plastic components of the outer skin must-have?

Answer 45

electrically conductive primer.

Question 46

How can water repellents have good effectiveness?

Answer 46

Depends on their good wetting ability and penetrating properties.

Question 47

when are sealants used?

Answer 47

Sealants are applied in such areas where the absolute tightness of an area have to be achieved without welding or soldering

Question 48

what is pot life?

Answer 48

time of the mixed sealing compound

Question 49

why do you pre-coat?

Answer 49

to increase adhesion

Question 50

purpose of seals?

Answer 50

maintain pressure, aerodynamic smoothers, prevent spread of flames.

Question 51

When are fillet seals used?

Answer 51

edges of structural joints to prevent the intrusion | of moisture/fluids and to achieve a smooth change of components. (max pressure protection)

Question 52

When are injection seals used?

Answer 52

Injection seals are applied to fill box sections, open holes, and tool holes that occur as the result of structural design

Question 53

To ensure all possible damages are detected, it is important to [a] the structure before [b]. Care should be taken not to damage the [c] treatments when using scrubbing brushes or scrapers.

Answer 53

``` Specified Answer for: a clean Specified Answer for: b inspection Specified Answer for: c protective ```

Question 54

In order to take the right repair action of a structural damage, the following points have to be considered: (1) [a] of damage, (2) [b] of damage (if not done in the first place) and (3) [c] of damage have to be determined.

Answer 54

``` Specified Answer for: a location Specified Answer for: b type Specified Answer for: c extent ```

Question 55

Any fasteners located within the area of corrosion and affected by the corrosion must be removed because: (1) corroded rivets or bolts must be [a] against undamaged fasteners, (2) possible [b] under the fastener head, (3) the fastener head must not be [c] and (4) foreign metal particles from the fasteners could cause new corrosion.

Answer 55

``` Specified Answer for: a changed Specified Answer for: b corrosion Specified Answer for: c grinded ```

Question 56

Abrasive blast cleaning is used for the removal of large area corrosion on aluminium flat sheets. [a] balls and [b] oxide powder can be used as shots. [c] balls should not be used in abrasive blasting cleaning.

Answer 56

``` Specified Answer for: a glass Specified Answer for: b aluminium Specified Answer for: c steel ```

Question 57

Corrosion must be removed entirely. Minimal [a] corrosion is the origin for new corrosion. The [b] depth of the skin must be compared with the specified limits in the SRM. According to the SRM, if the [c] depth limits are exceeded, the component has to be repaired or replaced.

Answer 57

``` Specified Answer for: a remaining Specified Answer for: b working Specified Answer for: c working ```

Question 58

Pretreatment for aluminium alloys includes: (1) Electrolytical treatment - Chromic or sulphuric [a], (2) Chemical treatment - [b] and (3) Wash-primer.

Answer 58

Specified Answer for: a anodizing Specified Answer for: b chemical conversion coating

Question 59

An anodic treatment is a direct current [a] acid treatment of the aluminium surface. Anodizing is used with all integrally milled [b] components of Airbus airplanes. It is also used on all bonded surfaces and [c] skin of the fuselage.

Answer 59

``` Specified Answer for: a chromic Specified Answer for: b structural Specified Answer for: c outer ```

Question 60

There are three types of paint repair. They are: (1) [a] - A proper paint finish is required, (2) Partial or Total [b] - The existing paint finish is solid in structure and has a satisfactory adhesion, (3) [c] Renewal - Heavily-aged paint finishes with cracks, poor cohesion, visible corrosion of the metal have to be completely removed.

Answer 60

``` Specified Answer for: a fixing Specified Answer for: b renewal Specified Answer for: c basic ```

Question 61

Chemical conversion coating (CCC) is applied to sheet metal parts [a] all fabrication processes such as bending, drilling and countersinking. Components that are subjected to operating temperatures above [b] °C should not be treated with CCC, as the [c] property of the coating will decrease.

Answer 61

``` Specified Answer for: a after Specified Answer for: b 70 Specified Answer for: c adhering ```

Question 62

When handling solvents, cleaners, adhesives, CCC materials and paints, the following safety advices have to be followed: (1) Do not [a] the fumes for long time. (2) Do not use these materials in small rooms without sufficient [b]. (3) Avoid [c] of these materials with your skin. (4) Rubber gloves must be worn.

Answer 62

``` Specified Answer for: a inhale Specified Answer for: b ventilation Specified Answer for: c contact ```

Question 63

Airbus uses a three-layer paint system for outer fuselage skin of their aircraft. These layers are: (1) [a] Primer for cohesion, (2) [b] Primer (Intermediate Primer) as corrosion protection and (3) a [c].

Answer 63

``` Specified Answer for: a wash Specified Answer for: b paint Specified Answer for: c topcoat ```

Question 64

There are two main reasons for paint finishes on airplanes and airplane parts: (1) A [a] finish to the outside airplane surface, and (2) The protection of the cabin, the structure and parts against [b], erosion and mechanical [c].

Answer 64

``` Specified Answer for: a pleasant Specified Answer for: b corrosion Specified Answer for: c damage ```

Question 65

The wash primer, also known as [a] Corrosion Resistant primer, is the first layer to be painted on metallic structures, and it acts mainly as an [b] contact. The FCR primer consists of [c] acid parts and zinc-chromate pigments (which act as moisture inhibitors).

Answer 65

``` Specified Answer for: a filiform Specified Answer for: b adhesion Specified Answer for: c phosphoric ```

Question 66

The intermediate primer is applied to the [a] primer or [b]-treated aluminium surfaces and is the [c] corrosion protection paint. It is comparable to the "paint primer" of the Airbus manufacturer that contains zinc-chromate

Answer 66

``` Specified Answer for: a wash Specified Answer for: b alodine Specified Answer for: c main ```

Question 67

The epoxide primer is relatively resistant to [a] attack. Epoxy primers that contain zinc-chromates are suitable for coating high strength [b] parts.

Answer 67

Specified Answer for: a chemical Specified Answer for: b steel