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7.18 Disassmbly > 7.18 Disassembly > Flashcards

7.18 Disassembly Flashcards

1
Q

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].

A

corrosion and metal fatigue

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2
Q

Cleaning fluids

A

Approved aircraft constructor

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3
Q

vacuum cleaners are inserted with

A

Protective rubber adaptors

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4
Q

Should you use air jets?

A

NO, avoid using them

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5
Q

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

A
  1. General visual
  2. Detailed
  3. Special detailed
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6
Q

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

A

Mirrors,borescope

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7
Q

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).

A 
Specified Answer for: a	
mechanical
Specified Answer for: b	
thermal
Specified Answer for: c	
metallurgical
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8
Q

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)

A 
Specified Answer for: a	
deformation
Specified Answer for: b	
section
Specified Answer for: c	
strength
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9
Q

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

A 
Specified Answer for: a	
depth
Specified Answer for: b	
length
Specified Answer for: c	
cross-sectional
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10
Q

What is a gouge?

A

continuous, sharp, or smooth channel-like groove in

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11
Q

What is a mark or abrasion?

A

scratched area of any size

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12
Q

What is a crack?

A

fracturewith

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13
Q

What is a nick?

A

the edge of a member or skin

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14
Q

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.

A 
Specified Answer for: a	
punctual
Specified Answer for: b	
heat
Specified Answer for: c	
strength
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15
Q

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].

A 
Specified Answer for: a	
plastic
Specified Answer for: b	
delamination
Specified Answer for: c	
debonding
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16
Q

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.

A 
Specified Answer for: a	
immediately
Specified Answer for: b	
completely
Specified Answer for: c	
new
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17
Q

What is a distortion?

A

twisting, bending or permanent strain

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18
Q

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

A

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

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19
Q

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].

A 
Specified Answer for: a	
embrittlement
Specified Answer for: b	
pitting
Specified Answer for: c	
oxide
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20
Q

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.

A 
Specified Answer for: a	
silica
Specified Answer for: b	
blue
Specified Answer for: c	
brown
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21
Q

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.

A 
Specified Answer for: a	
chemical
Specified Answer for: b	
electrolytical
Specified Answer for: c	
adhesion
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22
Q

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.

A

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

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23
Q

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

A

Use mechanical method

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24
Q

What if the corrosion is large and covers a big area

A

Use chemical method.

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25
Q

For corrosion removal of aluminum, components use what?

A

Use aluminum oxide (corundum). RED and BROWN color

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26
Q

What grain should you use to remove corrosion

A

240 then 400 to make a smooth surface

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27
Q

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

A

Use safety goggles or a face shield.

28
Q

Wire brushing can remove what type of corrosion

A

Heavy corrosion

29
Q

Abrasive cleaning can remove what type of corrosion

A

large area corrosion on a flat sheet.

30
Q

what can determine corrosion depth and remove heavy corrosion

A

Rotating files made out of carbide.

31
Q

what type of corrosion can be found on carbon steel

A

red iron rust.

32
Q

what type of corrosion can be found on titanium alloy

A

black or white-colored oxide.

33
Q

what happens when small chips from titanium are found?

A

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

34
Q

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

A

silica carbide. (Blue green color)

35
Q

what to check for after corrosion removal

A

check for cracks.

36
Q

What is anodizing?

A

A direct current chromic

acid treatment of the aluminium surface.

37
Q

What does CHEMICAL CONVERSION COATING (CCC) form?

A

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

38
Q

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

A

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

39
Q

What is the number of layers of aircraft paint airbus?

A

3 layers

1) wash primer
2) paint primer
3) Topcoat

40
Q

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

A

180KSI

41
Q

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

A

2 layers

1) epoxy primer
2) topcoat

42
Q

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

A

corrosion protection and adhesion will be impaired.

43
Q

when should wash primer not be used?

A

steel with a breaking strength of more than 180KSI

44
Q

perks of epoxy primer?

A

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

45
Q

all plastic components of the outer skin must-have?

A

electrically conductive primer.

46
Q

How can water repellents have good effectiveness?

A

Depends on their good wetting ability and penetrating properties.

47
Q

when are sealants used?

A

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

48
Q

what is pot life?

A

time of the mixed sealing compound

49
Q

why do you pre-coat?

A

to increase adhesion

50
Q

purpose of seals?

A

maintain pressure, aerodynamic smoothers, prevent spread of flames.

51
Q

When are fillet seals used?

A

edges of structural joints to prevent the intrusion

of moisture/fluids and to achieve a smooth change of components. (max pressure protection)

52
Q

When are injection seals used?

A

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

53
Q

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.

A 
Specified Answer for: a	
clean
Specified Answer for: b	
inspection
Specified Answer for: c	
protective
54
Q

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.

A 
Specified Answer for: a	
location
Specified Answer for: b	
type
Specified Answer for: c	
extent
55
Q

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.

A 
Specified Answer for: a	
changed
Specified Answer for: b	
corrosion
Specified Answer for: c	
grinded
56
Q

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.

A 
Specified Answer for: a	
glass
Specified Answer for: b	
aluminium
Specified Answer for: c	
steel
57
Q

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.

A 
Specified Answer for: a	
remaining
Specified Answer for: b	
working
Specified Answer for: c	
working
58
Q

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

A

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

59
Q

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.

A 
Specified Answer for: a	
chromic
Specified Answer for: b	
structural
Specified Answer for: c	
outer
60
Q

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.

A 
Specified Answer for: a	
fixing
Specified Answer for: b	
renewal
Specified Answer for: c	
basic
61
Q

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.

A 
Specified Answer for: a	
after
Specified Answer for: b	
70
Specified Answer for: c	
adhering
62
Q

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.

A 
Specified Answer for: a	
inhale
Specified Answer for: b	
ventilation
Specified Answer for: c	
contact
63
Q

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].

A 
Specified Answer for: a	
wash
Specified Answer for: b	
paint
Specified Answer for: c	
topcoat
64
Q

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].

A 
Specified Answer for: a	
pleasant
Specified Answer for: b	
corrosion
Specified Answer for: c	
damage
65
Q

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).

A 
Specified Answer for: a	
filiform
Specified Answer for: b	
adhesion
Specified Answer for: c	
phosphoric
66
Q

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

A 
Specified Answer for: a	
wash
Specified Answer for: b	
alodine
Specified Answer for: c	
main
67
Q

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

A

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

7.18 Disassmbly (6 decks)

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