Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

M7 By Ruhi > 7.18 Inspection + Repair Techniques > Flashcards

7.18 Inspection + Repair Techniques Flashcards

1
Q

What does ,damage’ refer to

A

A change of cross-sectional are or a permanent distortion of of a structural member.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What does ,defect’ refer to

A

Any event or condition which reduces the serviceability of the a/c

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Examples of defect

A

Leaks + discharge
Overhearing
Fluid ingress
Obstruction of drainage or vent holes on overflow pipe orifices.
Etc etc

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Examination of damage and defects.

A

For correct repair, full extent + category must be determined.
May be secondary damage.
Classified into damage categories.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Name the damage categories.

A

Allowable damage
Non-allowable damage.
Non-repairable damage.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Magnifying glasses.

A

For structures, a hand instrument with 8x magnifier

Greater then 8x for defect confirmation.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What to look out for on a visual inspection on a painted surface

A

Scaly/ blistered surface.
A change of colours.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Things to look out for during a visual inspection of a metal surface.

A

Dull or darkened area.
Pitted surface.
White, grey or red dust.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Removal of corrosion by abrasion by hand

A

Light corrosion, abrasive cloths and pads.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Removal of corrosion by wire brushing.

A

Heavy corrosion and heavy paint or dirt.
By hand or motor driven machines.
Best suited to corroded steel.
Ideally not aluminium due to galvanic corrosion.
Can scratch (stress raiser)
Use hand scraper first to remove loose dirt.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Removal of corrosion by grinding.

A

Uses motorised grinding wheels.
Avoid generating hot temps.
Not suitable for aluminium alloys.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Removal of corrosion by rotary files.

A

Suitable for aluminium and steel alloys.
Remove corrosion then use a fine paper for surface finish. (Same as grinding.)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Removal of corrosion by abrasive blasting.

A

Not for internal use.
A quick method of removing filiforme corrosion and scale from metal surfaces.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Removal of corrosion by neutralisation.

A

Not to be used in areas where it can not be washed of.
Used where there is deep corrosion in aluminium alloys.
Prepare a chromic acid/water mix.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Chromic acid corrosion inhibitor

A

Read mods sheets.
10% by weight chromic acid
Restores oxide layer.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Eloxadising

A

Electric oxidise aluminium.
Not suitable for parts that bend.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

3 main types of phosphate coatings for corrosion protection.

A

Manganese, zinc , iron.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Chemical conversion coating (CCC)

A

Anodine , iridite used by manufacturers
Surface is roughened

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

Airbus paint finishing.

A

3 layer system:
- wash primer
- paint primer
- coating lacquer

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

Boeing paint finishing.

A

2 layer system:
- paint primer
- coating lacquer

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

Fixing (paint finishes)

A

Cleaning and maintenance of existing paint finishes.
Repair of small imperfections using brushes.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

Partial or total renewal (paint finishes)

A

Existing finish is solid and has good adhesion.
Partial or total means a finish is aged or damaged.
A/c is partially or totally sanded and repainted.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

Basic renewal (paint finishes)

A

Heavily aged, cracks, skydrol damaged.
Any corrosion must be removed.
Paint removal, corrosion inhibitors and total build up of paint finishes.

24
Q

Electrically conductive paints.

A

Anti static primers for outer plastic components.
Is not applied to antennae covers.
Conductivity test performed
A minimum of 75% of countersinks in composites must be covered with the paint.

25
Q

Water repellant fluids - corrosion inhibitors.

A

Dinitrol - most commonly used.

26
Q

Levels of structural sealant.

A

Absolute
Extensive
Intermediate
Limited.

27
Q

Sealants are used to…? (Structural sealing.)

A

Contain fuel
Maintain cabin presssure
Reduce fire hazards
Exclude moisture
Prevent corrosion.
Fill gaps and smooth discontinuities on the a/c exterior.

28
Q

Categories of sealant.

A

Silicone.
- white, red or grey, used where heat resistance in necessary.

Non-silicone
- can be any colour, where heat resistance is not needed

29
Q

Classification of sealants.

A

Class A
- brush coat, thinned with solvents.
Class B
- filleting sealant, relatively heavy (low slump)
Class C
- Faying surfaces, medium consistency for good spread ability.

Class D
- hole filing, similar to B but with very low slump.

Class E+F
- sprayable sealant

30
Q

Environmental considerations of sealant

A

Must be slightly elastic due to expansion.

31
Q

What is squeeze out life.

A

Time in hours after thawing which the sealant can be extruded from the gun

32
Q

Special precautions for sealants.

A

Uncured silicones absorb CO2 so should not be stored in a CO2 type freezer.

Must be stored separately from other sealants.

Tools for silicone are for silicone only.

Sealants can be absorbed through the skin or inhaled. Leading to headaches, breathing problems, irritated eyes.

Emit flammable vapours before curing.

33
Q

Fillet seal

A

Applied at the edges of structural joints.
Air bubbles must be worked out.

34
Q

Injection seal

A

Applied to fill channels and holes.
Required to continue or back up a fillet seal.

35
Q

Faying surface seal

A

Applied to one surface with a roller.
Must apply sufficient to extrude out along joint.
Used to prevent corrosion and facilitate leak tracing in fuel tanks.

36
Q

Aerodynamic smoother

A

Exterior sealant of aircraft.

37
Q

Fastener sealing

A

Wet installation
Flush head, apply sealant either to the underside of the head or countersink prior to installation.

38
Q

Brush coat seals

A

Low viscosity sealant.

39
Q

Seal plane

A

Consists of barrier which fuel may not pass. The barrier consists of structural components, fasteners, sealant.

40
Q

Integral fuel tank sealing.

A

Fillet seals used.
Injection, pre-pack seals are used.
A three phase system is used:
- apply a brush coat.
- apply a small first fillet. Use fairing tool
- apply a full-size final fillet.

41
Q

What must you do to circuit breakers of components which are being maintained

A

Circuit breakers must be pulled and tagged.

42
Q

What is a la ally made jig used for

A

Keeping small parts like fasteners and nuts in their same relative position to the original item.

(Think of the cardboard sheet which we laid out the fasteners on for task 2 of workshop prior to assembly.)

43
Q

Which maintenance manual chapters contain information on maintenance practices during overhaul?

A

Chapters 20 and 70.

44
Q

What does a fasteners torque value depend on?

A

Material of fastener, thread type , size.

45
Q

Jigs

A

Used to hold items in place securely for accurate assembly of components in critical areas.

Also used to ensure that small actuators are preset to the exact length to assist in “rigging” the controls containing the actuator.

46
Q

Items which are commonly discarded after removal?

A

Filters, sealing rings, fuels , oils ,

47
Q

Seized fasteners.

A

Manuals can suggest a range of ways to remove seized fasteners e.g.

Penetrating oil, application of heat or cold to change diameters.

48
Q

What are solid aluminium rivets mainly used with

A

High strength aluminium alloy components.

49
Q

When are steel, titanium or Monel fasteners mainly used

A

Used for joints in areas of high temperatures.

50
Q

Solid rivets manufactured from 2117 and 7050

A

Are heat treated by the manufacture so no further treatment needed. Used to attach aluminium components when medium strength is needed.

51
Q

Rivets manufactured from 2017

A

Can be heat treated but this must be defined in a specific repair.

52
Q

Rivets manufactured from 2024.

A

Supplied in T4 condition.
Used to attach aluminium alloy components where high strength is needed.
Can be heat treated prior to use.

53
Q

Name the pin threaded fasteners.

A

Hi-lok, hi-lite, bull nose

54
Q

Where must blind fasteners not be used?

A

In areas where the fastener is in tension, subject to high vibration or fluid tight joints.

55
Q

Are cracks in the head of aluminium alloy 2017 nd 2024 rivets permitted

A

Yes, they are given specific limits

Cracks are not permitted In other aluminium alloy rivet heads or the material being riveted around the hole.

56
Q

Are cracks in the head of titanium or Monel

A

Nope. Just 2017 and 2024 aluminium.

57
Q

Acceptable limits for rivets.
5% criteria for rivets.

A

Generally lots of defects are acceptable ‘within given limits’.

Less then 5%of rivets have the defect or rivets with the defect are spaced at least 5 rivets apart then it is permitted.

M7 By Ruhi (17 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions