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Airframe Repairs > Transparencies > Flashcards

Transparencies Flashcards

1
Q

What are the 10 parts of an Engis X50?

A

Eyepiece
Viewing lens
Internal rotating scale
Lens barrel
Cursor
Depth scale
Focus ring
Lower lens
Transparent base
Feet

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2
Q

3 most common materials used in transparencies

A

Glass
Acrylic
Polycarbonate

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3
Q

Whats the benefit of polycarbonate in comparison with acrylic for transparencies?

A

Tougher and stronger, can withstand higher temperatures

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4
Q

Pre use check of an Engis X50

A

Ensure no damage
Ensure lenses are secured in
Fit rubber eyepiece

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5
Q

How is glass prepared for aircraft transparencies?

A

Annealed then thermally or chemically processed to increase strength

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6
Q

Two different types of chip on aircraft transparencies?

A

Surface chip
Edge chip

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7
Q

Two different types of surface chip on aircraft transparencies and allowable dimensions?

A

Negligible chip - less than 1mm diameter

Minor surface chip - less than 1mm depth, no more than 3mm width, not exceeding 25mm squared

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8
Q

What to do if Engis X50 reading is suspect?

A

Check against a known depth and replace if inaccurate

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9
Q

Whats the magnification of the Engis X50?

A

X50

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10
Q

What the field of view of Engis X50?

A

2.0mm

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11
Q

Whats the graduations on focus ring on Engis X50?

A

0.1mm (0.004 in)

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12
Q

What are the graduations on lens scale on Engis X50?

A

0.02mm (0.0008 in)

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13
Q

Whats the max measuring range on Engis X50?

A

1.6mm

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14
Q

Whats the size of Engis X50?

A

Dia - 41.5mm X Height - 122mm

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15
Q

Whats the weight of Engis X50?

A

83gm

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16
Q

3 categories of aircraft transparencies?

A

Forward windscreen and centre panels

Side panels or quarter lights

Cabin windows and ancillary transparent panels

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17
Q

3 classifications of areas of vision according to their optical effect?

A

Supercritical
Critical
Non-critical

18
Q

Aircraft designers select transparency materials based on:

A

Physical and mechanical properties

Ambient operating conditions

Optical quality

Application
- Pressurised cabins
- Non-pressurised cabins
- All weather capabilities

19
Q

What is one full rotation of the focus ring in an Engis X50?

A

8.0mm

20
Q

What do you use to measure the depth of crazing in a transparency?

A

Millimetre graph paper
A X10 magnifying glass
Suitable light source

21
Q

How to measure depth of indentation with an Engis X50?

A

Draw chinagraph line on clean area adjacent

Adjust focus ring until line is in focus, take measurement

Without adjusting focus ring, move over the indentation

Readjust focus until bottom of indentation is clear, take measurement

Subtract first reading from second, result is depth in mm

22
Q

How to assess distortion?

A

A grid board positioned in front of transparency. Any distortion can be observed from behind transparency identified by a distorted line on the grid board.

23
Q

How to identify delamination in transparencies?

A

Moisture ingress shows as cloudy areas

Delamination around edges can show as smooth edge or rough edge

Doubtful cases, shine a light through between two lines, if delaminated, an additional line will show.

24
Q

Whats controlled delamination?

A

Where release tapes are built into edges of panels to permit flexing in service

25
Q

How do you clean transparencies?

A

Coarse dirt washed off with water

Do not rub

Remove grease by swabbing with photographic grade wool saturated with aircraft transparency cleaner

Allow to air dry or swab dry

Wipe glass surfaces with chamois leather

26
Q

Outline transparencies Polishing prcedures

A

Reference AMM

  • Ensure all dirt cleaned
  • light hand pressure
  • renew polish cloth frequently
  • avoid accumulating polishing materials in recesses or frame abutments
27
Q

What to do with a superficial scratch?

A

Glass - Acceptable subject to aircrew approval

Plastic - remove with reference to ADS

28
Q

What to do with a moderate scratch?

A

Glass - acceptable subject to aircrew approval

Plastic - removed, consult ADS

29
Q

What to do with deep scratches?

A

Glass - Can cause cracks, should be replaced

Plastic- consult ADS to establish maximum permissible damage then remove using approved procedures if applicable

30
Q

How should transparencies be stored?

A

Cool, dry, well ventilated environment.

Keep away from vapours and abrasives

31
Q

6 types of damage to transparencies

A

Physical damage
Crazing
Delamination
Cracks
Bubbling
Discolouration

32
Q

Whats ADS?

A

Aircraft Document Set

33
Q

Two types of sealant?

A

Polysulphide
Silicones

34
Q

What temperature range do polysulphide sealants work at?

A

-55 to +120 degrees centigrade

35
Q

What are polysulphide sealants resistant to?

A

UV Light
Fuels
Oils
Hydraulic fluid

36
Q

What does RTV stand for?
What are they for?

A

Room temperature vulcanising (sealants)

Used in high heat areas and electrical components

37
Q

Whats curing and non curing sealants?

A

Curing form a tough rubbery solid resistant to weather, moisture and ozone.

Non curing are used for integrated fuel tanks as they swell on contact with fuel producing a tighter seal.

38
Q

Name the 3 procedures which may be carried out to repair transparent plastic panels

A

Repair scratch or score
Apply external patch
Apply insertion patch

39
Q

Whats perspex, oro glass and plexiglass another name for?

A

Acrylic

40
Q

What material can be treated by stretching to impart superior crack/craze resistance? (Transparencies)

A

Acrylic

41
Q

What material can only be used to clean an acrylic transparency?

A

Micro mesh

Airframe Repairs (11 decks)

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